Arleana do Bom Parto Ferreira de Almeida

Inquérito soroepidemiológico de leishmaniose canina em áreas endêmicas de Cuiabá, Estado de Mato Grosso

Leishmaniases are zoonoses that are undergoing expansion in Brazil. Dogs are of importance regarding transmission and dispersion of the disease, especially in areas presenting visceral leishmaniasis. The aim of this study was to evaluate the seroprevalence of leishmaniasis among domestic dogs in the urban area of Cuiabá. For this investigation, four districts of Cuiabá were selected, one in each administrative region. The dog sampling was defined statistically, taking the prevalence to be 8.4%. Among the 468 dogs examined, 16 presented an indirect immunofluorescence reaction, thus resulting in an overall prevalence of 3.4%. There was no predisposition towards canine leishmaniasis occurrences in relation to breed, sex or age. The main risk factors for occurrences of canine infection identified in the city of Cuiabá were the presence of dogs living in areas surrounding homes and the proximity of homes to forests. Thus, there have been changes in leishmaniasis occurrences within the urban environment.

Soroprevalência de anticorpos anti-Ehrlichia canis em cães de Cuiabá, Mato Grosso

Canine ehrlichiosis is a disease transmitted by ticks Rhipicephalus sanguineus and caused by Ehrlichia canis, obligatory intracellular bacteria. The present study examined the prevalence of anti-E. canis in 254 dogs from four administrative regions of Cuiabá, Mato Grosso, by indirect immunofluorescence assay. There was a prevalence of 42.5% (108/254) without significant difference between the studied regions. The variables age, breed, sex, habitat, access to rural and ticks were analyzed. The antibody titers ranged from 1:40 to 1:2,560. Only 32 (29.63%) seropositive dogs were infested with ticks, all R. sanguineus. The results confirm that do not have breed, sex or age predisposition to ehrlichiosis due E. canis, while the lowest occurrence of reactive dogs indoors probably related to low tick infestation, although no significant difference between dogs with or without infestation with the tick vector.

Use of Parasitological Culture to Detect Leishmania (Leishmania) chagasi in Naturally Infected Dogs

In Brazil, although the domestic dog is a major target for the control actions for visceral leishmaniasis, knowledge gaps of the Leishmania species present in those animals still exist in many endemic areas. The objective of this study was the use of parasitological culture as a diagnosis tool and identification of species of Leishmania and other trypanosomatids in the canine population in the city of Cuiaba/Mato Grosso. Biological samples such as blood, intact skin fragments, cutaneous ulcers, and bone marrow were collected during a cross-sectional study and cultured on biphasic medium (Novy-MacNeil-Nicolle [NNN]/Schneiders). Leishmania isolates were characterized through isoenzyme electrophoresis. Isolates were obtained from 11.2% (n=54) of the 482 animals studied considering the different anatomical sites investigated. Leishmania chagasi was confirmed in 8.3% (n=40) dogs and Trypanosoma caninum in 2.9% (n=14). The sample of intact skin presented a higher chance of isolation of L. chagasi in symptomatic dogs and bone marrow in asymptomatic dogs (p<0.05). The results presented in this study emphasize the value of culture and confirm, for the first time, the circulation of L. chagasi in the canine population in different neighborhoods of the city of Cuiaba and broaden the knowledge of the geographical distribution of T. caninum in Brazil.

Phlebotomine fauna, natural infection rate and feeding habits of Lutzomyia cruzi in Jaciara, state of Mato Grosso, Brazil.

Visceral leishmaniasis (VL) in Brazil is transmitted by the phlebotomine Lutzomyia longipalpis and in some midwestern regions by Lutzomyia cruzi. Studies of the phlebotomine fauna, feeding habits and natural infection rate by Leishmania contribute to increased understanding of the epidemiological chain of leishmaniases and their vectorial capacity. Collections were performed in Jaciara, state of Mato Grosso from 2010-2013, during which time 2,011 phlebotomines (23 species) were captured (68.70% Lu. cruzi and 20.52% Lutzomyia whitmani). Lu. cruzi females were identified by observing the shapes of the cibarium (a portion of the mouthpart) and spermatheca, from which samples were obtained for polymerase chain reaction to determine the rates of natural infection. Engorged phlebotomines were assessed to identify the blood-meal host by ELISA. A moderate correlation was discovered between the number of Lu. cruzi and the temperature and the minimum rate of infection was 6.10%. Twenty-two females were reactive to the antisera of bird (28%), dog (3.30%) and skunk (1.60%). We conclude that Lu. cruzi and Lu. whitmani have adapted to the urban environment in this region and that Lu. cruzi is the most likely vector of VL in Jaciara. Moreover, maintenance of Leishmania in the environment is likely aided by the presence of birds and domestic and synanthropic animals.

Natural Infection of Leishmania (Viannia) braziliensis in Mus musculus Captured in Mato Grosso, Brazil

We report natural infection by Leishmania (Viannia) braziliensis in Mus musculus and Necromys lasiurus using molecular analyses (PCR-RFLP) of femoral bone marrow and skin fragments. The aim of this study was to detect infection by pathogenic species of Leishmania in small mammals in the state of Mato Grosso, Brazil. The animals were captured in Peixoto de Azevedo, a cutaneous leishmaniasis-endemic region located in the north of the state, from October 30 to November 3, 2008. Natural infection by Leishmania in synanthropic rodents may be a threat to humans due to cohabitation of human domiciles in this area.

Avaliação clínica e molecular de cães com erliquiose

The canine monocytic ehrlichiosis is a cosmopolitan disease, caused by Ehrlichia canis, transmitted by ticks Rhipicephalus sanguineus that has been frequently diagnosed in dogs throughout the country. This study aimed to investigate the cytological and molecular Ehrlichia infection in 195 dogs examined at the University Veterinary Hospital of Mato Grosso, by analyzing the clinical and laboratory findings. In 48 dogs with positive cytology for Ehrlichia sp it was possible to detect the diversity of signs, with predominance statistically significant of pallor of mucous membranes (P≤0.05) as well as several hematological findings, occurring anemia, leukopenia and thrombocytopenia, or increased as normal cells. There was increased of plasma proteins, with hyperglobulinemia, however without any significant difference (P≥0.05), although this finding is common in that infection. Through the nested PCR technique it was possible to confirm the infection by E. canis in the city of Cuiaba.

Seroprevalence and risk factors associated with visceral leishmaniasis in dogs in Jaciara, State of Mato Grosso

INTRODUCTION Visceral leishmaniasis is a neglected disease. Jaciara, State of Mato Grosso has the most cases. This study aimed to determine the risk factors and seroprevalence of canine visceral leishmaniasis in urban and rural areas. METHODS This cross-sectional study of domestic dogs used enzyme-linked immunosorbent assay and indirect immunofluorescence test. RESULTS The prevalence was 54.7% among 345 analyzed samples. Short coat, age of 1-6 years, and living less than 100m from vegetation posed the highest infection risks. CONCLUSIONS Certain dog behaviors and characteristics, and their correlation with environmental conditions, were relevant in the high prevalence of canine leishmaniasis in Jaciara.

Occurrence and molecular characterization of cryptococcosis in dogs and cats in Mato Grosso, Brazil

Cryptococcosis is an infection that affects humans and animals, the etiology is attributed to Cryptococcus neoformans variety neoformans, C. neoformans var. grubii and Cryptococcus gattii. The infection is common in dogs and cats, causing respiratory, neurological, cutaneous and ocular infections. Aiming to better understand the epidemiology of cryptococcosis in animals in the region, this paper describe the occurrence and characterization of the Cryptococcus species involved in this illness in pet animals at Mato Grosso State, Brazil. Clinical samples of four cases, two in cats and two dogs, were submitted for pathological, microbiological and molecular analysis. Microscopically, in three cases, tissue sections stained with hematoxylin and eosin had absence to severe granulomatous reaction composed by histiocytes, multinucleated cells and lymphocytes infiltration. In one case, citological imprint analysis showed similar inflammatory mainly mononuclear and lymphocyte cells infiltration. All cases had variable amounts of intracellular and extracellular fungal structures compatible with Cryptococcus sp. on Periodic Acid-Schiff (PAS) stain. All clinical samples were positive for culture on Sabouraud Dextrose Agar (SDA) and morphologically classified as Cryptococcus sp. The isolates were PCR positive for C. gatti, being confirmed by sequencing technique. The findings characterize the molecular species involved in animal infections in the region, and may contribute to future studies of the epidemiology of C. gattii.

Trypanosoma caninum, a New Parasite Described in Dogs in Brazil: Aspects of Natural Infection

Abstract:  Trypanosoma caninum constitutes the most recent trypanosomatid species infecting dogs in Brazil. Due to the limited data available about this parasite, this study aims to disclose clinical and laboratory findings from 14 dogs naturally infected. The dogs were diagnosed during a cross-sectional survey in Cuiabá (Mato Grosso, Brazil) and followed up at an interval of 3, 6, and 12 mo in order to evaluate the clinical evolution and to investigate the parasite, the DNA, or both in different biological samples (intact skin, cutaneous scar, blood, bone marrow, and lymph node aspirate) by parasitological (culture and smear exam) and molecular (DNA-based tests) methods. Specific anti-T. caninum and anti-Leishmania antibody production was also evaluated. Ten of 14 dogs infected by T. caninum showed a good general state at the time of diagnosis, and this status did not vary during the follow-up. Anti-T. caninum and anti-Leishmania IgG antibodies were detected by IFAT in 10 and 2 animals, respectively. Concomitant infection by Leishmania chagasi was confirmed in 2 dogs, indicating an overlap of endemic areas in Cuiabá. Trypanosoma caninum (parasite or DNA) was found only in the intact skin in all animals examined. Our results suggest that T. caninum infection can be manifested as an asymptomatic case with low humoral immune response.

Phlebotomine sand flies and canine infection in areas of human visceral leishmaniasis, Cuiabá, Mato Grosso

Visceral leishmaniasis is a systemic infectious disease that can cause to a severe, potentially life-threatening chronic condition in humans. Risk factors for infection in urban areas have been associated with poor living conditions, the presence of sand fly vectors and infected pets. This study aimed to describe sand fly and canine infection in the neighborhoods of human visceral leishmaniasis occurrence in the city of Cuiabá, Mato Grosso State, central-western Brazil, reported between January 2005 and December 2006. A total of 1,909 sand flies were collected. They were predominantly males and the most frequent species were Lutzomyia cruzi (81.25%), Lutzomyia whitmani (13.88%) and Lutzomyia longipalpis (2.62%). The sand fly density was not significantly correlated with the variation of environmental factors. The prevalence of canine visceral leishmaniasis in the neighborhoods studied was 26.82% and it was found that areas with high density of vectors coincided with areas of high prevalence of dogs and those with the highest rates of human cases. The study of vectors and other potential hosts are essential for a good understanding of visceral leishmaniasis and the related public health concerns, aiming at the prevention and control of leishmaniasis in the city of Cuiabá, Mato Grosso State.