The state of Pará encompasses 26% of Brazilian Amazon where an enormous diversity of arboviruses has been found. This study aimed to assess the prevalence and distribution of hemagglutination-inhibition antibodies against antigens of six Flavivirus (yellow fever virus, Ilheus virus, Saint Louis encephalitis virus, Cacipacore virus, Bussuquara virus and Rocio virus) in water buffaloes in Pará state, Brazil. The prevalence of antibodies in these farm animals is important to determine the circulating arboviruses.

Feline sporotrichosis is a subcutaneous, infectious, and contagious mycosis, with zoonotic characteristics. Until now there are no reports on the isolation of Sporothrix sp. in cats in the state of Pará. The present work aimed to isolate Sporothrix spp. from a cat with possible zoonotic involvement in the city of Belém, Pará. Through the active search for suspected cases of sporotrichosis, carried out by members of the Center for the Control of Zoonoses of Belém (CCZ, Belém) the suspicion of the disease in a feline was reported, with probable transmission to its owner. Clinical evaluation was performed, and biological material was collected from the animal for identifying the agent. Microscopic evaluation of the collected sample and microbial culture confirmed the presence of Sporothrix sp. in the sample. This study is the first to report the microbiological isolation of Sporothrix sp. in a cat in the metropolitan region of Belém, Pará, with possible zoonotic transmission. This indicates a probable underreporting of cases, an unknowing regarding the reality of health conditions and the need for more accurate and comprehensive evaluation of sporotrichosis in this region.

The nutritional composition of bovine liver, particularly in terms of vitamins E, β-carotene, and cholesterol concentration, is significantly influenced by the cattle-rearing system and diet. This study aimed to elucidate the impact of four predominant cattle-rearing systems in the Eastern Amazon region on the vitamin E, β-carotene content, and cholesterol levels in bovine liver during the rainy season. Liver-tissue samples were collected from 48 cattle, with twelve specimens representing each rearing system. The systems encompassed two native pastures located in flood-prone areas, cultivated pastures on upland terrain and a confinement-rearing system. Our findings indicate that, when considering all rearing systems collectively, there were no significant differences in the levels of vitamins and cholesterol in the liver tissues (p > 0.05). However, a marked disparity in cholesterol levels emerged when comparing intensive rearing systems to extensive ones, with the former demonstrating notably higher concentrations (p = 0.01). Additionally, the intensive rearing system was associated with elevated levels of β-carotene (p < 0.01), α-tocopherol (p = 0.01), and β-tocopherol (p = 0.01) relative to the extensive systems. No significant variations were observed amongst the different extensive systems (p > 0.05). These results suggest that, while all rearing systems yielded liver tissues with typical concentrations of vitamins and cholesterol, the intensive rearing system led to a higher accumulation of certain vitamin compounds. This study highlights the substantial nutritional implications of different cattle-rearing systems in the Eastern Amazon and provides valuable insights for developing dietary strategies to optimize the nutritional quality of bovine liver. Therefore, the generated results are groundbreaking in the Eastern Amazon, Brazil, and inspire the development of new research projects to address other demands in this field and achieve additional outcomes.

The scientific literature currently lacks studies that evaluate the nutritional composition of the tissues of cattle raised in different systems, so that the nutritional effects can be known and used to enhance consumption and use in the diet. The aim was therefore to assess whether the mineral content of muscle tissue (longissimus lumborum) in cattle finished during the rainy season in the Eastern Amazon is influenced by different farming systems. The treatments consisted of four systems (three pasture production systems and one feedlot system). 1. native wetland pasture in Santa Cruz do Arari (Mesoregion of Marajó); 2. native wetland pasture in Monte Alegre (Mesoregion of Baixo Amazonas); 3. cultivated dryland pasture in São Miguel do Guamá (Mesoregion of Nordeste Paraense); and 4. Confinement in Santa Izabel do Pará (Metropolitan Region of Belém). The analyses were carried out on samples of the longissimus lumborum muscle tissue of 48 male, castrated, crossbred Nelore cattle, twelve per breeding system, from commercial farms, destined for meat production, finished during the rainiest period of the year (between January and June). In systems 1 and 2, the animals were slaughtered in licensed slaughterhouses; the animals in systems 3 and 4 were slaughtered in commercial slaughterhouses. Food sampling and chemical analysis, soil sample collection and analysis, longissimus lumborum muscle tissue collection, sample preparation and digestion, and inductively coupled plasma optical emission spectrometry were evaluated. The experimental design was completely randomized in a linear model with four rearing systems and one period (rainy). The data was compared using the Statistical Analysis Systems (SAS) program. All analyses were carried out considering a significance level of 0.05. Samples of the diets offered (pasture and concentrate) were also collected. The Amazon systems influenced the macro- and micromineral content in the muscles of cattle (p < 0.05). The interaction between pasture systems vs. confinement showed differences in the minerals calcium (Ca), magnesium (Mg), phosphorus (P), copper (Cu), zinc (Zn), iron (Fe), and manganese (Mn) (p < 0.05). However, there was no difference in the values of sodium (Na), potassium (K), and sulfur (S) between the rearing systems (p > 0.05). By contrast, the cultivated pasture system vs. extensive pasture showed differences in all the elements evaluated (p < 0.05). The rearing systems of the Eastern Amazon influenced the mineral content of beef, which continues to be an excellent source of macro- and microminerals and can compose the human diet.

The objective of this study was to investigate the etiology and sensitivity profile of Gram positive bacteria isolated from the milk of cows with mastitis. Milk samples were analyzed from the Nova Jerusalem, community located in the municipality of Paragominas, Southeast Region of the state of Pará. Of the total of 24 samples collected, 24.56% of the isolates were identified as Staphylococcus aureus, 14.03% as coagulase-negative Staphylococcus and 3.51% Streptococcus spp. The Staphylococcus aureus showed sensitivity to ceftiofur, enrofloxacin, streptomycin, neomycin, and norfloxacin, and higher resistance to bacitracin, penicillin G, and sulfonamides, the samples of coagulase-negative Staphylococcus were shown to be sensitive to the antimicrobials cephalothin, ceftiofur, enrofloxacin, streptomycin, and norfloxacin, and showed greater resistance to bacitracin and lincomycin, whereas in the samples that were isolated Streptococcus spp., were observed higher percentages of sensitivity against cephalothin, ceftiofur, gentamicin, and norfloxacin, and higher resistance to bacitracin and penicillin G. The results obtained may be related to the fact that the antimicrobials that showed bigger efficiency are not routinely used in the treatment of the animals studied, mainly because they have a higher market value, in relation to those that obtained greater microbial resistance.

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.