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Emerging and re-emerging infectious diseases constitute one of the main health problems worldwide. The objective of the research consisted of analyzing the development dynamics of adult mosquito populations of the species Ae. aegypti in Villa Clara province, Cuba during the period 2016-2020. The research covered the 13 municipalities of Villa Clara. An observational, descriptive, ecological, retrospective and analytical-statistical (by decision tree/exploratory data analysis) study was conducted. The study was based on the collection of positive samples/number of outbreaks reported in the 13 municipalities of the province, in the different months of the period analyzed, for the mosquito species Ae. aegypti, where each sample point corresponded to the number of specimens collected in one of the years covered, with one of the months of the year in question (12 months), the 13 municipalities, and 9 types of reservoirs. This resulted in 7 020 observations, which constitutes the sample size. The presence of the species under analysis was found in the 13 municipalities of the province, with abundant population densities; on the other hand, the variables with the greatest incidence in the population dynamics were: municipality and type of reservoir, with emphasis on the low tank, as the preferred oviposition and breeding site for this species. It is concluded that Ae. aegypti has a high capacity for adaptation and high ecological plasticity, with a marked correspondence between the ecology and habitat of the species under analysis.

Phytopharmaceuticals constitute a therapy that, when carried out on a scientific basis, becomes a necessary, safe, effective and, above all, economical alternative in the confrontation of diseases that affect humans and other animals, for the achievement of health. The objective of the research was to evaluate the effectiveness of a revitalizing ointment of Aloe vera L and Bixa orellana L for skin lesions in cattle. The methods used correspond to the transversal research for case control, a total of 76 animals of the classified by categories, females and males of mestizo breeds, belonging to the Basic Livestock Unit "Liberation of Caibarién", Caibarien, Villa Clara, Cuba were selected during the year 2019 where there were problems with the iron marking, the lesions and the statistical equivalence in both groups were taken into account. From the benefits of the two medicinal plants, an ointment was elaborated to treat skin lesions such as burns, wounds and in general, any lesion that tends to chronicity or infection and therefore it is required to accelerate the healing process. The revitalizing ointment proved to be a good healing agent, since it helps the prompt recovery of the lesions and of the animals. In no case did allergic reactions or irritation occur. Since there are difficulties with the acquisition of healing ointments in veterinary medicine, it constitutes an effective and economical alternative treatment, with a positive impact on livestock and industrial production, as well as on the environmental aspect.

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The presence of the freshwater mollusk Marisa cornuarietis (Linné, 1758) (Subclase Caenogastropoda) in Jutiapa Department (Guatemala) is reported for the first time. The five specimens with different stages of growth were captured in the Güija Lagoon belonging to the "El Güayabo" Village, Asunción Mita municipality.

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