Anti-Brucella canis antibodies in dogs naturally infected with Leishmania infantum and associated histological alterations in the genital tract.

In canine visceral leishmaniasis, coinfections can aggravate the disease. Our aim was to investigate Brucella canis in dogs infected with Leishmania infantum. One hundred and six L. infantum-seropositive dogs were submitted to serology for B. canis, PCR for B. canis and L. infantum, and histopathological analysis of the genital tract. Anti-B. canis antibodies were detected in seven dogs whose clinical signs, L. infantum load and histological alterations were similar to those of seronegative animals. The circulation of anti-B. canis antibodies was low but demonstrates the exposure of dogs to this bacterium in a visceral leishmaniasis-endemic area.

Dogs and Opossums Positive for Vaccinia Virus during Outbreak Affecting Cattle and Humans, São Paulo State, Brazil.

During a vaccinia virus (VACV) outbreak in São Paulo State, Brazil, blood samples were collected from cows, humans, other domestic animals, and wild mammals. Samples from 3 dogs and 3 opossums were positive for VACV by PCR. Results of gene sequencing yielded major questions regarding other mammalian species acting as reservoirs of VACV.

Vaccinia virus in Feces and Urine of Wild Rodents from São Paulo State, Brazil.

The origin of Vaccinia virus (VACV) outbreaks in Brazil remains unknown, but since the isolation of VACV in Mus musculus mice during a zoonotic outbreak affecting cattle and milkers, peridomestic rodents have been suggested to be a link between cows and wild animals. Considering that experimentally infected mice eliminate viral particles in their feces, we investigated the presence of VACV in the feces and urine of wild rodents that were captured in the forest areas surrounding milking farms in the central west region of São Paulo State. For the first time, this work reports the detection of VACV by PCR in the feces of naturally infected Oligoryzomys flavescens, Oligoryzomys nigripes, and Sooretamys angouya, and in the urine of Oligorizomys flavescens, which raises important questions about the spread of VACV by rodent feces and its potential to induce clinical infections in cows.

Vaccinia Virus in Blood Samples of Humans, Domestic and Wild Mammals in Brazil.

Outbreaks of Vaccinia virus (VACV) affecting cattle and humans have been reported in Brazil in the last 15 years, but the origin of outbreaks remains unknown. Although VACV DNA have been already detected in mice (Mus musculus), opossums (Didelphis albiventris) and dogs during VACV zoonotic outbreaks, no transmission to cattle or humans from any of these were reported during Brazilian outbreaks. In this work, we assessed the PCR positivity to VACV in blood samples of cows and other domestic mammals, wild rodents and other wild mammals, and humans from areas with or without VACV infection reports. Our results show the detection of VACV DNA in blood samples of cows, horse and opossums, raising important questions about VACV spread.

Evaluation of three formulations of culture media for isolation of Brucella spp. regarding their ability to inhibit the growth of contaminating organisms.

Three culture media (Brucella agar, Farrell medium, and CITA) were compared for their effectiveness in inhibiting contamination and for isolating Brucella spp. One hundred lymph nodes from pigs (n = 50) and wild boars (n = 50) with lymphadenitis were collected in slaughterhouses in the State of São Paulo and were assessed on these three selective media for Brucella spp. All of the samples were negative for Brucella spp. on the three culture media. On the agar medium, fungal (70 plates) and Gram-positive bacterial (59 plates) contaminants were observed; in the CITA medium, the absence of fungal and Gram-positive bacteria on 15 plates was observed; no bacterial or fungal growth was observed on the Farrell media. The results demonstrated that the CITA and Farrell media inhibited the growth of contaminants better than the Brucella agar.

Viral type characterization and clinical aspects of canine parvovirus in naturally infected dogs in São Paulo State, Brazil / Caracterização viral e aspectos clínicos de parvovirose em cães naturalmente infectados no Estado de São Paulo

Since the first isolation of canine parvovirus type 2 (CPV-2) in late 70's new virus types as CPV-2a and CPV-2b have been emerged and becoming prevalent in natural canine population and more recently, a third subtype was identified , CPV-2c. The main purpose of this study was to detect and characterize canine parvovirus currently present in Central-West region of São Paulo state, in Brazil. Fecal samples were collected of vaccinated and non-vaccinated dogs, clinically suspected of having CPV infection brought to the Infectious Diseases Service, Veterinary Hospital of FMVZ-UNESP. All samples (n=30) were screening for canine parvovirus through hemagglutination test and those resulting as positive (n=20) were submitted to PCR and the products were subsequently sequenced for subtype characterization. Results were tested for association with age, hematological values, viral hemagglutination titers in the feces, vaccination status and survival. Leukopenia was found in all animals, death occurred in 30% of unvaccinated dogs and in 42% of vaccinated ones. In a total of 20 positive sequenced samples, 18 were classified as CPV-2b, one as CPV-2c, and one as CPV-2a, being CPV2a and CPV2c detected in unvaccinated puppies. Compared to the reference samples amino acid change at position 426 in those circling virus was identified. The study results demonstrate the predominance of CPV-2b and the presence of CPV-2a and CPV-2c in naturally infected, vaccinated and unvaccinated dogs in in São Paulo region.(AU)

Desde o primeiro isolamento do parvovirus canino tipo 2 (CPV-2) no final dos anos 70 novos subtipos virais como CPV-2a e CPV-2b surgiram e foram se tornando prevalentes na população canina; posteriormente um terceiro subtipo foi identificado, CPV- 2-C. O principal objetivo deste estudo foi detectar e caracterizar os subtipos de parvovírus canino atualmente presente na região Centro-Oeste do Estado de São Paulo-Brasil. Amostras de fezes foram coletadas de cães vacinados e não vacinados, atendidos no Serviço de Enfermidades Infecciosas dos Animais, Hospital Veterinário da FMVZ-UNESP, com suspeita clínica parvovirose . Todas as amostras (n = 30) foram submetidas teste de hemaglutinação para parvovirus canino e as positivas (n = 20) submetidas a PCR; os produtos amplificados foram subsequentemente sequenciados para caracterização do subtipo viral. Os resultados foram associados com a idade, os valores hematológicos, os títulos de hemaglutinação viral nas fezes, estado de vacinação e sobrevivência. A leucopenia foi encontrada em todos os animais; Obito foi observado em 30% dos cães não vacinados e 42% dos vacinados. Em um total de 20 amostras positivas sequenciadas, 18 foram classificadas como CPV-2b, uma como CPV-2c, e uma como CPV-2a. CPV 2a e CPV2c foram detectados em filhotes não vacinados. Em comparação com a amostra de referência foi evidenciada uma mudança de aminoácido na posição 426 nas amostras virais circulantes. Os resultados do estudo demonstram a predominância de CPV-2b e a presença de CPV-2a e CPV-2c em cães naturalmente infectados, vacinados e não vacinados na região de São Paulo.(AU)