Toxoplasmosis is a disease of global importance, with great impact on public and animal health, caused by the protozoan Toxoplasma gondii. Domestic dogs, when infected, can present several types of lesions, especially young animals or when the immune system is deficient. Data on the incidence of dogs infected with T. gondii have great importance of animal epidemiology, thus estimating the risk of infection in populations of a given region. However, studies related to the incidence of this parasite in dogs are extremely scarce. This study aims to determine the prevalence and cumulative incidence of dogs infected with T. gondii in the city of Botucatu, SP. Three hundred and sixty nine dogs aged between two months and one year will be studied, which were sampled in an earlier study and whose blood samples were previously collected and stored at -20° C. The animals were randomly selected and distributed homogeneously in five regions of the urban area of Botucatu (North, South, East, West, Central). Blood samples were collected on days 0, 180 and 360, and will be submitted to serologic diagnosis by Immunofluorescence Antibody Test (IFAT) to detect IgG antibodies. Statistical analysis will be performed to determine the prevalence and cumulative incidence. These measures will be calculated for both total dogs and those from each of the five regions.
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