Mohadeseh Motamed- Jahromi; Kourosh Azizi; Mohammad Hossein Kaveh
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Kourosh Azizi; Mohsen Kalantari; Masoumeh Amin
Abstract
Background: Scorpions, as a group of venomous invertebrates, are distributed worldwide including the Middle East. These arthropods are distributed throughout Iran, are dangerous to humans and animals, and can cause severe damages and even death.Methods: In this cross-sectional study, scorpions were collected ...
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Background: Scorpions, as a group of venomous invertebrates, are distributed worldwide including the Middle East. These arthropods are distributed throughout Iran, are dangerous to humans and animals, and can cause severe damages and even death.Methods: In this cross-sectional study, scorpions were collected from different parts in southern Iran such as Kohgiluyeh and Fars provinces using hand catch method with U.V torch. Morphological identification of scorpion specimens was done using specific keys.Results: Besides different species of scorpions, Hottentotta jayakari Pocock, was identified in Amir Oncology Hospital, Shiraz city, Fars province, South of Iran, 1895.Conclusion: Hottentotta jayakari is endemic in tropical regions and its existence in Shiraz with a mild climate seems unexpected. In addition, Amir Hospital is an oncology treatment center and this scorpion was caught on the hospital grounds. It is possible that more species can be identified in this province by conducting more studies.
Zahra Nasiri; Mohsen Kalantari; Masoumeh Amin; Salman Daliri; Kourosh Azizi
Abstract
Background: The prevalence of arboviruses is increasing worldwide. Their vectors are widely distributed in different continents of the world. Despite the importance of the phleboviruses, unfortunately data about the spread of the viruses in human and animal communities is very limited.Methods: This study ...
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Background: The prevalence of arboviruses is increasing worldwide. Their vectors are widely distributed in different continents of the world. Despite the importance of the phleboviruses, unfortunately data about the spread of the viruses in human and animal communities is very limited.Methods: This study is a systematic review of phlebovirus and its vectors worldwide, with emphasis on Middle East countries including Iran. Accordingly, all English language articles which were conducted up to the end of 2020 were found by searching the databases, including Web of Science, PubMed, Google Scholar, Science Direct, and Scopus. Furthermore, the authors used the Strobe checklist to evaluate the quality of the articles.Results: Phlebotomus perniciosus was the main vector of the Tosca virus in the Mediterranean regions such as Italy, France, and Greece. In African counties, Aedes species were more important vectors of phleboviruses, especially Rift Valley fever. As these diseases can easily spread to even uninfected areas of Asia, permanent monitoring is needed to control phleboviruses.Conclusion: Practical methods have been used to control the vectors and hosts of phleboviruses. Some important methods are listed as follows: impregnated bed nets/curtains, residual spraying, repellents, establishment of the robust surveillance of animal and their products, and limited movement of livestock during outbreak time. These methods can minimize the risk of transmission of phleboviral diseases, especially RVF infection.
Mohadeseh Motamed- Jahromi; Kourosh Azizi; Mohammad Hossein Kaveh
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Kourosh Azizi; Hedayat Dorzaban; Aboozar Soltani; Hamzeh Alipour; Seyed Aghil Jaberhashemi; Mostafa Salehi-Vaziri; Tahereh Mohammadi; Zahra Fereydouni; Azim 0000-0002-4167-5843 Paksa
Abstract
Background: Aedes mosquitoes transmit important arboviral diseases such as dengue to humans. This study was conducted to determine dengue virus infection in Aedes mosquitoes, emphasizing Aedes aegypti by Reverse Transcriptase-Polymerase Chain Reaction Assay from different regions in Southern Iran.Methods: ...
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Background: Aedes mosquitoes transmit important arboviral diseases such as dengue to humans. This study was conducted to determine dengue virus infection in Aedes mosquitoes, emphasizing Aedes aegypti by Reverse Transcriptase-Polymerase Chain Reaction Assay from different regions in Southern Iran.Methods: Aedes samples were collected by standard methods from different habitats of Hormozgan province, Southern Iran, in 2016-2017, and identified by morphological characteristics. In this study, TissueLyserII was used to homogenize the collected mosquitoes. In addition, the RT-PCR technique was used to identify dengue virus RNA.Results: Overall, 1351 larval and adult Aedes mosquitoes were collected from five sites in Hormozgan Province, including 452 adults and 899 larvae. Five species from Aedes genera were collected (Ae. aegypti, Ae. vittatus, Ae. caballus, Ae. caspius, Ae. vexans). The investigations of dengue virus infection in Aedes mosquitoes showed no dengue virus infection in this species.Conclusion: This study provides important information about Aedes mosquitoes. Vector control strategies must be emphasized and prioritized. Such actions prevent the establishment of Aedes mosquitoes and the spread of arboviral diseases in new areas. In addition, early detection of arboviruses in vectors and entomological monitoring can enhance the control measures for arbovirus diseases.
Jalal Mohammadi; Mohsen Kalantari; Zahra Nasiri; Davood Mehrabani; Hamzeh Alipour; Mohammad Djafar Moemenbellah-Fard; Kourosh Azizi
Abstract
Background: Visceral leishmaniasis (VL) is still widespread in tropical and subtropical regions worldwide. The vector of the disease is a sandfly, when infected with Leishmania parasite, can transmit the parasite from humans to other vertebrates. As knowledge about causative agents, vectors, and reservoirs ...
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Background: Visceral leishmaniasis (VL) is still widespread in tropical and subtropical regions worldwide. The vector of the disease is a sandfly, when infected with Leishmania parasite, can transmit the parasite from humans to other vertebrates. As knowledge about causative agents, vectors, and reservoirs of VL in Iran is necessary to control the disease, the present review study has focused on the disease elimination status from a health perspective in the country. Methods: In a recent review, various databases, such as Web of Science, PubMed, Scopus, Cochrane Library, Science Direct, Google Scholar, MEDLIB, Irandoc, Magiran, and SID were searched using the keywords “visceral leishmaniasis”, “VL”, “kala-azar”, “causative agent”, “parasite”, “vector”, “reservoir”, and “Iran”, and the retrieved data were extracted and reviewed independently during 2001-2019. Results: 475 published studies were recorded about VL in Iran from 2001 to 2021. 68 articles were later excluded from the study due to duplication after the initial review. Leishmania infantum and L. tropica were the causative agents, and dogs and humans were the reservoirs. The most common vectors were Phlebotomus major, P. kandelakii, P. keshishiani, P. alexandri, P. perfiliewi, and P. tobbi in different country regions. Conclusion: The prospect of eliminating VL in Iran is inadequate. Based on the findings, L. infantum and L. tropica were the causative agents, and humans and the Caninae subfamily were the VL reservoirs in the country. These findings can be added to the literature when health policymakers target preventive measures for VL in Iran.
Leila Izadpanah; Hamzeh Alipoor; Marzieh Shahriari-Namadi; Kourosh Azizi; Mohsen Kalantari; Abouzar Soltani; Masoumeh Bagheri
Abstract
Background: Sandflies are the vectors of at least eight different diseases, the most important of which is cutaneous leishmaniasis (CL). CL is a major public health problem in Iran, with annual cases increasing to more than 20,000 in 2019. Fars Province has the second-highest number of cases with more ...
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Background: Sandflies are the vectors of at least eight different diseases, the most important of which is cutaneous leishmaniasis (CL). CL is a major public health problem in Iran, with annual cases increasing to more than 20,000 in 2019. Fars Province has the second-highest number of cases with more than 3000 cases in 2019 in Iran. This study aimed to survey the fauna and different species of sandflies (Diptera: Psychodidae: Phlebotominae) in Fars Province, southwest Iran. Methods: This is a cross-sectional study. Sandflies were collected in urban and rural regions using the sticky-traps method, and then they were cleared and fixed in puris medium and identified using the pictorial key. Results: A total of 1071 of sandflies were collected. The dominant species consisted of 5 species of Phlebotomus (Ph. papatasi 55.4%, Ph. alexandri 17.4%, Ph.sergenti 5.6%, Ph. caucasicus 1.4%, Ph. ansari 0.46% and 6 species of Sergentomyia (Ser. sintoni 10.8%, Ser. antennata 5.4%, Ser. tiberiadis 1.4%, Ser. tobbi 1%, Ser. baghdadis 0.5%, and Ser. halepensis 0.09%. Conclusion: This investigation showed that Ph. papatasi was the most prevalent species playing a crucial role in the transmission of cutaneous leishmaniasis in Fars Province. Species of Ph. papatasi and Ph. sergenti are the main vectors of CL in Iran. The healthcare system must take steps to control cutaneous leishmaniasis, raise awareness of the disease, and apply effective ways to prevent it.
Mohammad Ebrahimi; Marziyeh Hamyali Ainvan,; Mohsen Kalantari; Kourosh Azizi
Abstract
Background: Scorpions are a group of poisonous invertebrates that are widely distributed in the Middle East countries including Iran. They cause serious injuries and death to humans and domestic animals in Fars province. These arthropods are settled in subtropical regions of the province. Methods: In ...
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Background: Scorpions are a group of poisonous invertebrates that are widely distributed in the Middle East countries including Iran. They cause serious injuries and death to humans and domestic animals in Fars province. These arthropods are settled in subtropical regions of the province. Methods: In this study, a total of 35 out of 430 Mesobuthus eupeus, including 15 males and 20 females, were selected, and then their major morphometric characteristics including the whole body length, pedipalp length, length and width of carapace, leg segments, abdomen, and tail segments, as well as the size of the poison gland, pectinal organ length, and pectinal tooth count were measured using a Collis-Vernier caliper scale. Results: The measurements of different body parts were bigger in females than in males, except that pectinal tooth count in males (26.93mm±.88) was greater than that in females (22.20±1.00). The number of simple eyes on each side did not differ between males and females. Other features showed to be higher for females than males. Conclusion: The results of the main morphometric features showed that the mean scores of the characters, except for the pectinal tooth count, in female M. eupeus species were bigger than those in male ones. The findings of this study are suggested to be used to provide a valid identification key for scorpions in Iran.
Mohsen Kalantari; Qasem Asgari; Khadijeh Rostami; Shahrbano Naderi; Iraj Mohammadpour; Masoud Yousefi; Mohammad Hassan Davami; Kourosh Azizi
Abstract
Background: Anti-Toxoplasma antibodies were identified in female university students referred to Valie-Asr hospital of Mamasani from Azad and Payame-Noor Universities, using serological and molecular methods. Methods: Based on the prevalence and characteristics method, 504 serum samples were collected ...
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Background: Anti-Toxoplasma antibodies were identified in female university students referred to Valie-Asr hospital of Mamasani from Azad and Payame-Noor Universities, using serological and molecular methods. Methods: Based on the prevalence and characteristics method, 504 serum samples were collected from female university students, during 2015, and evaluated by Enzyme-Linked Immun-Sorbent Assay (ELISA), Modified Agglutination Test (MAT), and Polymerase Chain Reaction (PCR) based on B1 gene for detection of Toxoplasma gondii. The data were analyzed using SPSS 19 software. Results: Out of 504 studied female students, 27 (5.36%) and 36 (7.14%) cases were found to be positive for anti-Toxoplasma IgG antibodies by MAT and ELISA, respectively. Moreover, 5 (0.99%) cases were found to be positive for anti-Toxoplasma IgM. PCR detected the Toxoplasma DNA in 58 out of 504 (11.51%) samples. Conclusions: Findings of the current study revealed that Toxoplasma was a common infection among female university students in Mamasani district in Fars province. Seronegative individuals are at risk for the disease, as well as congenital toxoplasmosis in later stages of their life. Preventive measures should be taken to reduce the rate of infection.
Saeed Shahabi; Ali Pouryousef; Kourosh Azizi; Bahador Sarkari
Abstract
Background: Rodents have a significant role as a reservoir in zoonotic diseases. Rodents which live close to human habitats such as muroid species play an important role in public health and economy. The current study aimed to evaluate the intestinal helminths infections of the Zagros Mountain rodent, ...
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Background: Rodents have a significant role as a reservoir in zoonotic diseases. Rodents which live close to human habitats such as muroid species play an important role in public health and economy. The current study aimed to evaluate the intestinal helminths infections of the Zagros Mountain rodent, Calomyscus (Calomyscus cf. bailwardi), in Shiraz, capital of Fars province, southern Iran. Methods: This cross-sectional study was carried out from April to October 2019, and a total of 10 Calomyscus were trapped. The animals were transferred to the animal laboratory for euthanization and dissection. Each of the digestive organs was separately cut and examined to identify their intestinal helminths. Parasites were removed by a special needle, and then transferred to 5% glycerin alcohol for the identification of the isolated helminths, using carmine staining. Results: Among the 10 total numbers of specimens, 60% (6 out of 10) were infected. All of the intestinal helminths obtained from the rodents were identified as Syphacia obvelata. Conclusion: Given the fact that the infected rodents which live in close contact with human society may cause rodent-borne infections among the residents, this parasitological study can be important in identifying the epidemiologic pattern related to zoonotic diseases, especially in rarely studied host species like Calomyscus cf. bailwardi.
Kourosh Azizi; Aboozar Soltani; Shokat Ali Amiri; Mohammad Reza Fakoor Ziba; Mohammad Djaefar Moemenbellah-Fard
Abstract
Background: The application of insecticides against vector mosquito larvae is a crucial step to control human malaria. Insecticide resistance is a major impediment to vector control strategies. The main aim of this study was to conduct laboratory and semi-field evaluations on lethal and residual effects ...
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Background: The application of insecticides against vector mosquito larvae is a crucial step to control human malaria. Insecticide resistance is a major impediment to vector control strategies. The main aim of this study was to conduct laboratory and semi-field evaluations on lethal and residual effects of temephos and pyriproxyfen insecticides against malaria mosquito larvae, Anopheles stephensi. Methods: Both susceptibility test and residual bioassay were performed to assess the lethal concentrations of each insecticide on 50% (LC50) of the IV instars larval populations and their activity periods according to standard protocols of WHO. Nine and eleven different concentrations with two sets of control in each case were applied for temephos and pyriproxyfen, respectively. Data were analyzed using probit analysis and SPSS software. Results: The LC50 and LC90 for temephos and pyriproxyfen under laboratory conditions were 0.4 and 0.63, and 1.69 × 10-4 and 4.036 × 10-4 ppm, respectively. Although the field strain of An. stephensi larvae was completely susceptible to pyriproxyfen, there was noticeable resistance (8% mortality at the diagnostic dose) to temephos in Nikshahr County, Southeast Iran. This is the first report of resistance to temephos for this malaria main vector in Iran. Depending on the applied variable doses, the residual effects of temephos and pyriproxyfen under semi-field conditions lasted maximally for 3 and 10 weeks, respectively. Conclusion: The high lethal and residual effects of pyriproxyfen on mosquito larvae confer an unprecedented opportunity in vector control operations leading to elimination of malaria in Iran.
Ehsan Saki; Abouzar Soltani; Mohammad Djaefar Moemenbellah-Fard; Mohsen Kalantari; Hedayat Dorzaban; Kourosh Azizi
Volume 6, Issue 1 , January 2018, , Pages 2-7
Abstract
Background: Fipronil systemic insecticide and integrated vector management (IVM) leading to control and/or reduction of zoonotic cutaneous leishmaniasis (ZCL) cases were evaluated in the studied endemic foci of Fars province, southern Iran, during 2016 to 2017. Methods: Based on available data on disease ...
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Background: Fipronil systemic insecticide and integrated vector management (IVM) leading to control and/or reduction of zoonotic cutaneous leishmaniasis (ZCL) cases were evaluated in the studied endemic foci of Fars province, southern Iran, during 2016 to 2017. Methods: Based on available data on disease circumstances collected from Center for Disease Control (CDC) of Shiraz University of Medical Sciences, incidence of disease, and demographics of the natives, five villages were randomly selected among those with high and medium CL infection in Kharameh area. All villagers were checked by physical examination and the incidence rates of ZCL cases were recorded. IVM interventions were implemented. Indeed, these procedures consisted of fipronil systemic insecticide poison baits, indoor residual spraying (IRS), outdoor spraying of the patients’ houses, and the thermal fogging (three times) during peak periods of sand flies’ activities. Results: After interventions, the incidence rates of ZCL decreased by 2.55% in Mehrabad village, in which all IVM methods were implemented. Similarly, the incidence of disease was reduced by 4.89% in Sofla and Moezabad villages, using exclusively fipronil poison baits. Besides, these incidence rates declined by 1.15% in two control villages of Soltan-Shahr and Abshor, where examination of the rodent reservoir hosts was performed. Conclusion: Fipronil and IVM methods were advantageous in reducing the incidence rates of leishmaniasis, but it seems that the use of fipronil systemic insecticide as a poison bait against reservoir rodent was significantly more effective (P-Value=0.01).
Fahime Khademi; Mohammad Reza Samaei; Kourosh Azizi; Abbas Shahsavani; Hassan Hashemi; Aida Iraji; Abdolkhalegh Miri
Volume 4, Issue 1 , January 2016, , Pages 2-6
Abstract
AbstractBackground: Biogas is obtained by anaerobic decomposition of organic wastes buried materials used to produce electricity, heat and biofuels. Biogas is at the second place for power generation after hydropower and in 2000 about 6% of the world power generation was allocated to biogas. Biogas is ...
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AbstractBackground: Biogas is obtained by anaerobic decomposition of organic wastes buried materials used to produce electricity, heat and biofuels. Biogas is at the second place for power generation after hydropower and in 2000 about 6% of the world power generation was allocated to biogas. Biogas is composed of 40–45 vol% CO2, 55–65 vol% CH4, and about 1% non-methaneVOCs, and non-methane volatile organic compounds. Emission rates are used to evaluate the compliance with landfill gas emission regulations by the United States Environmental Protection Agency (USEPA). BTEX comounds affect the air quality and may be harmful to human health. Benzene, toluene, ethylbenzene and xylene isomers that are generally called BTEX compounds are the most abundant VOCs in biogas.Methods: Sampling of VOCs in biogas vents was operated passively or with Tedlar bags. 20 samples were collected from 40 wells of old and new biogas sites of Shiraz’ landfill. Immediately after sampling, the samples were transferred to the laboratory. Analysis of the samples was performed with GC-MS.Results: The results showed that in the collection of the old and new biogas sites, the highest concentration of VOCs was observed in toluene (0.85ppm) followed by benzene (0.81ppm), ethylbenzene (0.13ppm) and xylene (0.08ppm).Conclusion: The results of the study showed that in all samples, most available compounds in biogas vents were aromatic hydrocarbon compounds.These compounds’ constituents originate from household hazardous waste materials deposited in the landfill or from biological/chemical decomposition processes within the landfill.
Mohammad Ali Baghapour; Seyed Mohammad Mazloomi; Kourosh Azizi; Razieh Sefidkar
Volume 3, Issue 4 , October 2015, , Pages 128-132
Abstract
Background: The consumption of healthy food is considered as an essential need to devoid the physical, chemical, and biological hazards. The importance of this issue is more conspicuous in places such as hospitals where people with somehow compromised immune systems are under treatment. Therefore, this ...
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Background: The consumption of healthy food is considered as an essential need to devoid the physical, chemical, and biological hazards. The importance of this issue is more conspicuous in places such as hospitals where people with somehow compromised immune systems are under treatment. Therefore, this research aimed to evaluate the microbiological quality of food contact surfaces in a kitchen in one of the hospitals of Shiraz University of Medical Sciences. Methods: In the present study, samples were taken from 48 food contact surfaces according to ISO 18593:2004(E) and placed into the bags containing diluting solution; they were then transferred to the laboratory for microbial analysis in the cold chain. The microbial analysis was carried out according to ISO 4833-1:2013 and BS ISO 4832:2006 for enumeration of total bacterial count and coliform. Results: Based on the results presented here, 39.6% and 85.7% of the samples showed acceptable contamination with regard to the enumeration of total bacterial and coliform count. Besides, 18.2% and 72.7 % of work surfaces groups (cutting board, table, and hand) showed acceptable contamination with regard to the enumeration of total bacterial count and coliform in comparison to the standards. Furthermore, 45.9% and 89.2% of other surfaces showed acceptable total bacterial and coliform count, respectively. Conclusion: The results showed that safe management of the kitchen, education of the staff and also improvement of the equipment used are necessary.
Zahra Soltani; Mohammad Reza Fakoorziba; Mohammad Djafar Moemenbellah-Fard; Mohsen Kalantari; Mohsen Akbarpour; Hossein Faramarzi; Kourosh Azizi
Volume 3, Issue 4 , October 2015, , Pages 160-164
Abstract
Background: Cutaneous Leishmaniasis (CL) is endemic in many parts of Iran. This study was conducted to investigate the fauna and some biologic factors of sand flies and detect CL vector(s) in Kharameh district which is one of the most important foci of the disease in Fars province, southern Iran. Methods: ...
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Background: Cutaneous Leishmaniasis (CL) is endemic in many parts of Iran. This study was conducted to investigate the fauna and some biologic factors of sand flies and detect CL vector(s) in Kharameh district which is one of the most important foci of the disease in Fars province, southern Iran. Methods: To identify the fauna, a total of 1549 sand flies were collected from April 2014 to March 2015. To determine the monthly activity, sand flies were collected from indoor and outdoor areas of the lowland and the highland regions. Results: Ten species of phlebotomine (four Phlebotomus spp. And six Sergentomyia spp.) were identified and Phlebotomus papatasi was the dominant species (53.45%). To determine the sand flies naturally infected by Leishmania spp., 188 female sand flies (145 P. papatasi, 29 P. sergenti, and 14 P. alexandri) were subjected to polymerase chain reaction (PCR) assay. Two (13.16%) specimens of P. papatasi were found to be positive for Leishmania major. Conclusions: To the best of our knowledge, this is the first PCR detection of L. major within naturally infected P. Papatasis and fly as the main vector in this region of south Iran.
Mohammad Reza Fakoorziba; Mohammad Djaefar Moemenbellah-Fard; Kourosh Azizi; Heshmatollah Shekarpoor; Hamzeh Alipoor
Volume 2, Issue 1 , January 2014, , Pages 2-7
Abstract
Background: Medicinal plant extracts such as those obtained from Salvia species have a wide variety of chemical compounds in their essential oils. The repellency of a number of essential oils including those from the labiates like Salvia against several insect species including the common house flies ...
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Background: Medicinal plant extracts such as those obtained from Salvia species have a wide variety of chemical compounds in their essential oils. The repellency of a number of essential oils including those from the labiates like Salvia against several insect species including the common house flies is reported. Objective: The aim of this investigation was to find out the excito-repellency effects of Salvia sclarea L. (Lamiaceae) extracts against adult house flies, Musca domestica L. (Diptera: Muscidae). Methods: Air-dried plant material from the aerial parts of S. sclarea was subjected to hydro-distillation in a Clevenger type glass apparatus model Soxhlet with acetone, benzene, petroleum ether, chloroform, and aqueous solvents. Only adult house flies were inserted into an exposure chamber and their behavior was monitored for feeding tendency, repellency rate and deterrence rate. Statistical analyses were carried out by one-way analysis of variance (ANOVA) with computation of the significance of differences in the outcome of various treatments. Results: There were significant differences among most of the various extracts with their controls in the sequential effects of feeding (P=0.04), deterrent (P=0.023) and repellency (P=0.01) rates of house flies. The order of potency for various extracts with a concentration of 100 g/l was as follows: petroleum ether> benzene> water> acetone> chloroform. Conclusion: It is thus conceivable to search for native means of combating house flies by fractionating the active ingredients in the Clary sage in the light of its excito-repellency effects.
Kourosh Azizi; Mohammad Djaefar Moemenbellah-Fard; Mousa Khosravani-Shiri; Mohammad Reza Fakoorziba; Aboozar Soltani
Volume 2, Issue 1 , January 2014, , Pages 30-35
Abstract
Background: Human malaria remains a major malady in Eastern Iran. Vector control interventions such as indoor residual spraying are used to fight with the disease. This study was undertaken to determine the lethal and residual effects of three different pyrethroid insecticides on adult mosquitoes of ...
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Background: Human malaria remains a major malady in Eastern Iran. Vector control interventions such as indoor residual spraying are used to fight with the disease. This study was undertaken to determine the lethal and residual effects of three different pyrethroid insecticides on adult mosquitoes of Anopheles stephensi on different surfaces in Iran, as part of a national program to monitor insecticide resistance in endemic areas. Methods: Two main endemic foci were selected as collection sites. Wild adult females of An. stephensi (mysoriensis strain) from the first focus were subjected to standard susceptibility tests, using lambdacyhalothrin, deltamethrin and cyfluthrin insecticides within holding tubes according to the method proposed by WHO. In Kazerun, the residual effects of these compounds were examined by conical bioassay tests of An. stephensi (type strain) on plaster and cement walls. Data were analyzed using Mann-Whitney test to determine the differences in susceptibility and residual effects of An. stephensi mosquitoes to these insecticides. Results: The susceptibility of females of An. stephensi to three concentrations of lambdacyhalothrin, deltamethrin and cyfluthrin insecticides culminated in full scale mortality at the highest diagnostic dose. The maximal residual time of these three insecticides on plaster and cement walls was estimated to be about three months. There was no significant difference in the mortalities of An. stephensi on different sprayed surfaces (P=0.653). Conclusion: All field-collected An. stephensi populations exhibit gross susceptibility to all diagnostic doses of the three evaluated insecticides. In endemic areas, lambdacyhalothrin reveals a slightly longer residual activity than the other two insecticides.
Mohammad Djaefar Moemenbellah-Fard; Mohammad Reza Fakoorziba; Kourosh Azizi; Mohsen Mohebbi-Nodezh
Volume 1, Issue 1 , July 2013, , Pages 41-47
Abstract
Background: The German cockroach, Blattella germanica L. (Dictyoptera: Blattellidae), has become resistant to many insecticides due to control failures in hospital and student dormitory settings of southern Iran. Objective: This study was thus designed to detect and monitor carbamate resistance in two ...
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Background: The German cockroach, Blattella germanica L. (Dictyoptera: Blattellidae), has become resistant to many insecticides due to control failures in hospital and student dormitory settings of southern Iran. Objective: This study was thus designed to detect and monitor carbamate resistance in two strains of German cockroach using lethal dose bioassay methods. Methods: Wild dormitory (D) and hospital (H) strains were collected. Adult males were subjected to the jar exposure procedure. A range of concentrations based on the world health organization (WHO) standard concentration of carbamate insecticides (carbaryl, bendiocarb, propoxur) were used. For each insecticide, four to seven different concentrations leading to >0% and propoxur > bendiocarb. The ratio of LD50 in H strain to that of D strain for bendiocarb was about twice that of the other two insecticides indicating that German cockroaches were most susceptible to bendiocarb under both environments. Conclusion: It is concluded that excessive reliance on carbaryl in both D and H settings has led to resistance.
