Pesquisa de riquétsias em áreas antropizadas

Abstract

Ticks are efficient vectors of various infectious agents, such as protozoa, viruses and bacteria, for both humans and animals, and their importance in public health is increasingly recognized. Among the various infectious diseases transmitted to man, rickettsial diseases have a prominent role in the Americas. In Brazil, Rickettsia rickettsii and Rickettsia parkeri are the only bacteria transmitted by ticks and have been shown to be associated with human infectious disease. As infections by both are associated with epidemiological scenarios of anthropic origin with host and environmental behavioral changes. In both cases there is an imbalance in the relationship between hosts and parasites and an increase in infectious diseases. In this thesis, the relationship between pathogenic rickettsiae or unknown pathogenicity is discussed in three articles, with vectors, hosts and the environment in three different eco-epidemiological scenarios characterized by environmental changes of anthropic origin of different intensity. In the first, the relationship between rickettsiae and populations of ticks Amblyomma triste, Rhipicephalus microplus, Amblyomma sculptum in wetland deer kept in paddocks after their removal from their natural environment, the floodplain, was studied. In the second article, the relationship between dogs, rickettsiae and ticks Amblyomma ovale was investigated in the best-preserved remnant of inland Atlantic Forest, the Iguaçu National Park (PNI) and in urban forest fragments of it. In the third article, an area under intense anthropic effect was investigated for rickettsiae in argasid tick, Ornithodoros cerradoensis, a species recently described in the Cerrado of Goiás in the region of Araguapaz-GO.