Mm Semironi, M Bahrani, Mh Fallah Mehrabadi , N Ranjbar, K Absalanfard, M Tangestani Makan , Mh Rabiee,
Volume 13, Issue 4 (3-2018)
Abstract
Background and Objectives: Brucellosis is one of the most important zoonosis diseases. The aim was to estimate the seroprevalence of brucellosis in rural cattle, sheep, and goat of Bushehr Province.
Methods: This cross-sectional study was conducted in 2012-2014. For the cattle population, a total of 118 villages and 891 cattle and for sheep and goat population, a total of 202 villages, 526 flocks, 3064 sheep, and 7182 goats were included. Samples were examined with Rose Bengal, 2-mercaptoethanol and wright tests.
Results: In the cattle population, 28 out of 118 villages (20.34%, CI 95%: 13.94%-28.73%) and 20 out of 891 cattle (3.36%, CI 95%:2.28-4.77%) were seropositive. Additionally, in the sheep and goat population, 89 out of 202 villages (44.06%, CI 95%: 37.10%-51.20%), 142 out of 526 flocks (27%, CI 95%: 23.25%-31%), and 335 out of 10246 sheep and goats (3.27%, CI 95%: 2.93%-3.63%) were seropositive.
The prevalence at the individual level of all animals was 3.53%in 2012 which was significantly higher than 2013 ( 2.59%) (P=0.02). Totally, in 3 years, the prevalence of brucellosis in sheep (3.88%) was significantly higher than goats (3%) (P = 0.02) and the prevalence in female animals (3.52%) was significantly higher than male animals (1.58%) (P <0.001).
Conclusion: Due to the reduction of the prevalence, the test and slaughter policy together with the could further reduce and control the spread of the disease in the animal population.
Maryam Aghajarinezhad, Yahya Salimi, Shahab Rezaeian, Ghobad Moradi, Fatemeh Khosravi Shadmani, Roya Safari Faramani, Ebrahim Shakiba, Yahya Pasdar, Behrooz Hamzeh, Nayebali Rezvani, Mitra Darbandi, Farid Najafi,
Volume 18, Issue 2 (9-2022)
Abstract
Background and Objectives: Serological studies are based on the detection of antibodies. However, the produced antibodies decrease over time; therefore, such methods cannot provide a valid estimate of prevalence and incidence. The present study aimed to determine the serum prevalence and cumulative incidence in the Ravansar cohort population (Youth and RaNCD Cohort) in October 2020.
Methods: A random sample of 716 people aged > 18 years old were selected from the participants in the Ravansar cohort study in October 2020. Euroimmun anti-SARS COV-2 IgG ELISA kits (Lübeck, Germany) were used to measure antibody levels. Seroprevalence was estimated with considering of cut-off = 1, and cumulative incidence (modified and modified based on test specificity) was determined using modeling.
Results: In the present study, the serum prevalence of COVID-19 viral infection in the Ravansar cohort population from 22 October 2020 to 18 November 2020 was estimated to be %35.16 (95%CI: %31.64, %38.79). Modified Cumulative incidence and modified based on test characteristics from 20 February to 18 November 2020 were estimated to be %68.85 and %67.71, respectively.
Conclusion: Although very high cumulative incidence may be a sign of approaching herd immunity, adherence to health protocols is still recommended due to the potential role of asymptomatic cases in transmitting the disease to other members of the community; and the presence of new variants of the virus and reduced antibody levels should be considered.
