Alireza Mirahmadizadeh; Mousa Ghelichi-Ghojogh; Fatemeh Rezaei; Mehdi Nejat; Haleh Ghaem; Jafar Hassanzadeh; Mohammadreza Karimi; Zohre Khodamoradi; Kimia Jokari; Leila Jahangiry
Abstract
Background: Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) can be transmitted through direct, indirect, or close contact with infected people by contaminated respiratory droplets or saliva. This study aimed to investigate the epidemiology of coronavirus disease 2019 (COVID-19) and the secondary ...
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Background: Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) can be transmitted through direct, indirect, or close contact with infected people by contaminated respiratory droplets or saliva. This study aimed to investigate the epidemiology of coronavirus disease 2019 (COVID-19) and the secondary attack rate (SAR) in the cases’ close contact.Methods: A total of 431 confirmed COVID-19 patients were randomly selected using systematic random sampling from 15 May to 13 June 2020. The required data were extracted from the CORONALAB database of the Center for Disease Control and Prevention (CDC) at Shiraz University of Medical Sciences. Detection of COVID-19 was performed using Real- Time Polymerase Chain Reaction (RT-PCR) and nasopharyngeal swabs. SAR was also calculated for different groups.Results: Among the index cases, 64.27% were male, 24.80% were public sector employees, and 4.87% were admitted to the intensive care unit. In addition, most of them aged 30-39 years. The SAR was 11.56% (95% CI: 9.86% to 13.25%) in the close contacts. Accordingly, the highest SAR was observed among the friends, 19.05% (95% CI: 7.17% to 30.92%), followed by the spouses of COVID-19 cases, 16.67% (95% CI: 10.81% to 22.51%). Furthermore, diabetes (6.03%) and cardiovascular disease (5.1%) were the most common comorbidities among the index cases.Conclusion: The findings suggested that the SAR was relatively lower among the close contacts. Considering the familial and non-familial relationships between the index cases and their close contacts were the major causes of disease transmission. Therefore, it is crucial to conduct tracing for COVID-19 contacts in all cases with whom patients have had close contact.
Mehdi Nejat; Mohammad Fararouei; Hamid Reza Tabatabaie; Parvin Afsar Kazerooni; Mohsen Akbarpoor; Roksana Estakhrian Haghighi
Volume 4, Issue 2 , April 2016, , Pages 95-102
Abstract
Background: Complete and fast diagnosis, registry and treatment programs are the main effective strategies for controlling infectious diseases. In addition, an organized and extended infectious disease surveillance system is crucial in designing and monitoring communicable diseases control programs. ...
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Background: Complete and fast diagnosis, registry and treatment programs are the main effective strategies for controlling infectious diseases. In addition, an organized and extended infectious disease surveillance system is crucial in designing and monitoring communicable diseases control programs. The quality of the surveillance system can be evaluated by several indices such as timeliness, completeness and sensitivity. This is an evaluation study to measure the mentioned indices for 3 zoonotic diseases (leishmaniasis, brucellosis and rabies) surveillance system. Methods: The indexes such as completeness, timeliness and sensitivity of surveillance system were measured using the data obtained from population based (door to door) interviews and recorded data obtained at each level of health and medical sectors or administrative centers within the diseases reporting system. Interviews were conducted for 5969 participants and the required information was obtained. Results: The total completeness, timeliness and sensitivity of case reporting for leishmaniasis were 26.9%, 103.2 days and 11.1%, respectively. These indexes forbrucellosiswere14.3 %, 58 days, 12.1% and those for suspected rabieswere100%, 83.4 days and 48.2%, respectively. Conclusion: It seems that so called immediate communicable diseases reporting system is not providing reliable, complete and timely information to the health authorities. Program monitoring and personnel training, especially physicians, are recommended to improve the quality of the surveillance system and the related indexes.