The aim of the present study was to detect DNA of Toxoplasma gondii in Crassostrea spp. oysters cultured in the state of Pará, Brazil. A total of 400 oysters were directly collected from a fixed rack system. Gills, gastrointestinal tract (GIT) and intervalvular liquid were separated and grouped into pool samples of 10 animals, resulting in 40 samples each of gills, GIT and intervalvular liquid. DNA extraction was performed using a commercial kit, and T. gondii DNA was detected by nested PCR using the primers Toxo3 and Toxo4, which produced an amplification product of 155 bp of the T. gondii gene B1. Nucleotide sequencing was performed for positive samples, and the obtained sequences were identified by comparison with sequences in GenBank. The DNA of T. gondii was detected in 5.8% (7/120) of the pool samples, of which 7.5% (3/40) was in the GIT, 5% (2/40) in the gills, and 5% (2/40) was in the intervalvular liquid. The obtained sequences presented 100% identity and overlap with T. gondii DNA sequences. This is the report of detection of T. gondii DNA in oysters from genus Crassostrea spp. originating from the state of Pará, eastern Amazon.

Introduction: Serological surveys are important to assess the health status of wild animals. In this study, antibodies against Leptospira spp, causal agents of leptospirosis, were detected in free-living marsupials in the State of Pará, Brazil. Methods: Nineteen blood samples collected from marsupials in the municipalities of Peixe-Boi, Viseu, and Castanhal were subjected to microscopic agglutination tests. Results: In total, 36.8% (7/19) of samples were positive, and two exhibited coagglutination. The most frequent serovars were Icterohaemorrhagiae (60%; 3/5), Panama (20%; 1/5), and Nupezo (20%; 1/5). Conclusions: Anti-Leptospira spp antibodies currently circulate in free-living marsupials in Northeastern Pará.

Leptospirosis is a zoonosis of worldwide distribution in which the agent can infect several animal species and accidentally humans. In view of the limited number of studies on anti-Leptospira antibodies in wild animal species, especially those living in aquatic environments, we sought in this study to investigate the presence of these antibodies in the spot-legged turtle (Rhinoclemmys punctularia) maintained in captivity in the Rodrigues Alves Botanical Garden-Amazon Zoobotanical Park, located in Belém, Pará State, Brazil. Serum samples were collected from 31 turtles, and identification of anti-Leptospira antibodies was performed using the microscopic agglutination test, using a collection of 31 live antigens which represent 19 serogroups of Leptospira. Among the analyzed samples, 54.83% (17/31) were observed to be reactive, and co-agglutination was detected in a further six samples which were not accounted for in the frequency of serogroups. The most frequently detected serogroups were Tarassovi 72.72% (8/11), Celledoni 18.18% (2/11), and Pomona 9.09% (1/11)], with titers ranging from 200 to 400, being this the first study to report infection of these serogroups in this species of chelonios. The animals were kept in water tanks, which probably favored the transport of the agent and allowed its transmission to the spot-legged turtle. We thus confirmed presence of anti-Leptospira antibodies in chelonians maintained in the Rodrigues Alves Botanical Garden.

We describe anti-Leptospira spp. agglutinin in yellow-spotted river turtles (Podocnemis unifilis)in the Amazon region. Ninety-eight serum samples from individuals housed at the Bosque Rodrigues Alves Zoobotanical Garden of Amazonia, Belém, PA, Brazil, were subject to the microscopic agglutination test (MAT) using 19 different Leptospira spp. antigen serogroups. Thirty-four of the 98 samples (35%) were reactive, with titers ranging from 100 to 3200, and eight 8 reactive samples (23.5%) co-agglutinated under two or more serovars.The most common serogroup was Hebdomadis (26.9%, 7/26), followed by Semaranga (23%, 6/26), Shermani (19.2%, 5/26), Djasiman (11.5%, 3/26), and Australis (7.7%, 2/26); Bataviae, Javanica, and Sejroewere represented by a single sample each (3.9%). The presence of turtles reactive to anti-Leptospira spp. antibodies implies exposure to the pathogen.

Abstract We evaluated the prevalence of anti-Toxoplasma gondii antibodies in the serum samples collected from domestic cats in Belém, Pará, Brazil. We also correlated the presence of T. gondii antibodies with environmental variables and cat-owner habits. Four-hundred and forty-seven serum samples from domestic cats were analyzed. The sera were tested using an indirect immunofluorescence assay. Among the animals analyzed, 21.92% (98/447) were seropositive. A statistically significant association was found in relation to age and serology among the animals over 1 year old (p<0.01): in the group up to 1 year old, 12.82% (20/156) of the animals were positive, and in the group over 1 year old, 26.80% (78/291) were positive. Our results show that the cats in Belém, Pará region have anti-T. gondii antibodies, and their owners are not aware of toxoplasmosis or how to prevent its transmission.

Tick-borne blood cell pathogens, which are challenging to diagnose, are primarily detected using molecular techniques. Therefore, this study aimed to detect the main infectious agents involved in 50 cases of suspected hemoparasitosis in dogs treated at the Veterinary Hospital Mário Dias Teixeira of the Federal Rural University of the Amazon. Hematological parameters were evaluated, and blood samples were subjected to polymerase chain reaction (PCR) assays for DNA amplification of the following species: Ehrlichia canis, Anaplasma platys, and Babesia canis. The PCR test results indicated that the most prevalent infectious agent was E. canis, present in 12% (6/50) infected animals, followed by A. platys and B. canis, present in 8% (4/50) and 2% (1/50) infected animals, respectively. Regarding hematological analysis, the most relevant changes were anemia, lymphopenia, thrombocytopenia, leukocytosis, and leukopenia. The availability of molecular techniques allows the management of the most appropriate treatment to infected animals in a rapid and specific way.

Although, serological studies for leptospirosis in iguanas have already been performed, there is no report in the Amazon region. Therefore, the present study aimed to investigate the presence of anti-Leptospira sp. in free living Iguanas-verdes (Iguana iguana) of Mangal das Garças Park, metropolitan region of Belém, Pará, Northern region of Brazil. Twenty-nine blood samples of Iguana-verde (I. iguana) were collected from Mangal das Garças Park. For the serological diagnosis of Leptospira sp. it was employed microscopic agglutination test (MAT) with 25 live antigens of Leptospira sp. as antigens. It was observed that all samples were non-reactive, suggesting no exposure to the agent.

Free-living Columbidae are considered the second largest reservoir of Chlamydia psittaci, transmitting the agent to humans and other animals. The present study aimed to identify the presence of Chlamydia spp. in samples of lung and stool collected from free-living domestic pigeons (Columba livia domestica) captured at the Mangal das Garças Naturalistic Park in Belém, Pará, Brazil, using semi-nested polymerase chain reaction, and also correlate the clinical and post-mortem findings of animals positive for Chlamydia spp. Among the 45 animals analyzed, 10 (22.2%) were positive for Chlamydia spp.; the positive findings originated from 5 (50%) lung samples and 5 (50%) stool samples, with no overlap between animals and samples. None of the animals evaluated in this study showed clinical signs of chlamydiosis; rather, these were only found during necropsy of positive animals, mainly through pulmonary, hepatic, splenic, and intestinal changes. These findings demonstrate that free-living pigeons can be reservoirs of Chlamydia spp. and transmit the agent silently to humans and animals, which is concerning for public and animal health, since these birds are easily found in urban areas cohabitating with humans, other species of birds, and other animals.