ArticleEcoHealth2026
Serology and PCR for Apicomplexa and SARS-CoV-2 in feral cats from a Brazilian island.
Article in EcoHealth, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Authors and funding
17 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Feral cats in insular environments represent a relevant interface between wildlife, environmental contamination, and zoonotic risk under a One Health perspective, as feralization increases exposure to infections and facilitates pathogen transmission. Herein, we surveyed Toxoplasma gondii, Sarcocystis spp., Neospora caninum, and SARS-CoV-2 in Furtada Island, Mangaratiba, Rio de Janeiro, Brazil, where there has been a feral cat population since the 1950s. This study aimed to investigate serological, molecular, and morphological indicators of infection in feral cats by assessing antibodies against Toxoplasma gondii, Sarcocystis spp., Neospora caninum, and SARS-CoV-2, detecting Apicomplexa DNA in reproductive tissues, and evaluating the morphology of the uterus, ovaries, testes, and epididymides. It was demonstrated that 40.4% (21/52) were exposed to T. gondii, 13.7% (7/52) were exposed to Sarcocystis spp., and no cats were seropositive for N. caninum. Additionally, no feline was positive for SARS-CoV-2 through serological investigation. No histological changes were observed in the reproductive tissues, and the DNA of the agents was not detected using molecular methods. This is the first investigation of host-pathogen interaction in feral cats from Furtada Island in southeastern Brazil. The data confirm that Toxoplasma gondii and Sarcocystis spp. are circulating within this feral cat population. These findings highlight the importance of feral cats as sentinels of environmental contamination and support the need for One Health-based surveillance strategies in insular ecosystems.
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Registered trials
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