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Objective. The aim of this work was to determine the rates of prevalence and recurrence of TVT infection in owned dogs, as well as the distribution of the disease, in Cuajinicuilapa, Guerrero, Mexico. Materials and methods. This work was an observational, descriptive, longitudinal study. A TVT diagnosis was performed in all dogs in the community based on clinical records, a physical examination, and a cytological evaluation, and further confirmed by histopathology. Tissue samples were surgically obtained for histopathological analysis and, when required, to remove tumors and give treatment with vincristine; a GPS system was used to identify possible spatial groupings. All cases were re-evaluated one year after. Results. A prevalence of 5.15% was found in 1047 dogs (512 females and 535 males; 25 positive females and 29 positive males). TVT infection was more frequent in 2-3-years-old dogs. A spatial aggregation pattern was observed in the local cases. One year after, no lesions were found in the 29 animals treated. Conclusions. TVT is a common disease, and its distribution suggests its aggregation in certain areas of the locality. Further studies on the dynamics of dog populations in small cities are required. [ABSTRACT FROM AUTHOR]

Desmodus rotundus is a transmitter of zoonotic and emerging diseases to humans and livestock, such as rabies. Most infectious diseases are spatially limited by the presence of the transmitter, whose abundance and survival are influenced by environmental conditions and the presence of food sources. A tool that facilitates its study is the use of Geographic Information Systems. The objective of this study was to analyze the interaction of populations of hematophagous bats and humans, through the development of a probable model of dispersal of D. rotundus based on known shelters and different environmental variables, in addition to analyzing the relationship between shelters identified for three years and their proximity to human settlements, as a process of coexistence. The study was conducted in the state of San Luis Potosi from 2014 to 2016. A total of 180 shelters of D. rotundus distributed towards the Huasteca region were identified, 80 % of these were built by man and 57 % were inhabited. A buffer of 5 km around from the location of each shelter was calculated, finding inside a total of 976 rural communities and 15 cities, with 337,836 inhabitants. The average distance from shelters to the first human settlement was 518.65 ± 11.33 m. It is necessary to continue studying the association between urbanization and the emergence of zoonoses, through the understanding of the interactions between wild animals-livestock-humans. [ABSTRACT FROM AUTHOR]