RESUMO: O objetivo deste artigo foi descrever a frequência e as lesões causadas por parasitas metazoários e protozoários em gambás (Didelphis virginiana) no México. De 2019 a 2021, vinte Gambás (D. virginiana) foram coletados no estado de Colima, México. Estudos post mortem, parasitológicos e histopatológicos foram realizados para identificar e descrever suas lesões. Todos os gambás (20/20) apresentaram pelo menos um tipo de parasita dos doze encontrados, os mais abundantes foram os nematóides 58,33% (7/12) Didelphostrongylus hayesi, Turgida turgida, Cruzia sp., Viannaia sp., Trichuris didelphis, Trichostrongylidae e Gnathostoma sp. Protozoários 25% (3/12) Sarcocystis sp., Besnoitia sp. e Sarcocystis sp. Só uma única espécie de Mathevotaenia sp., 8,3% (1/12) e Paragonimus mexicanus 8,3% (1/12). Os sistemas mais acometidos foram o digestivo, respiratório e musculoesquelético. Os parasitas mais abundantes foram T. turgida (20/20) 100%, Cruzia sp., 80% (16/20), e Viannaia sp., 30% (6/20), seguidos pelos cistos de Sarcocystis sp., 30% (6/20). As lesões observadas causadas pelos vários tipos de parasitas foram: D. hayesi produziu broncopneumonia granulomatosa eosinofílica, P. mexicanus gerou pneumonia granulomatosa focal eosinofílica e Besnoitia sp. produziu pneumonia intersticial linfoplasmocítica eosinofílica focal. Ganthostoma e T. turgida geraram uma gastrite focal granulomatosa eosinofílica grave. Viannaia sp., Sarcocystis sp., Mathevotaenia sp. e Trichostrongylidae causaram enterite mucosa eosinofílica difusa. Cruzia sp. e Trichuris didelphis causaram tiflite mucosa eosinofílica difusa. Cistos de Sarcocystis spp. foram detectados no citoplasma das fibras musculares, sem alterações histológicas. RESUMO Didelphis virginiana México 201 2021 D (D Colima mortem 20/20 2020 20 (20/20 encontrados 5833 58 33 58,33 7/12 712 7 12 (7/12 sp 25 3/12 312 3 (3/12 83 8 8,3 1/12 112 1 (1/12 1/12. . digestivo musculoesquelético T 100 100% 80 16/20, 1620 16/20 , 16 (16/20) 30 6/20, 620 6/20 6 (6/20) 6/20. P grave difusa spp musculares histológicas 202 20/2 2 (20/2 583 5 58,3 7/1 71 (7/1 3/1 31 (3/1 8, 1/1 11 (1/1 10 162 16/2 (16/20 62 6/2 (6/20 20/ (20/ 58, 7/ (7/ 3/ (3/ 1/ (1/ 16/ (16/2 6/ (6/2 (20 (7 (3 (1 (16/ (6/ (2 ( (16 (6
ABSTRACT: The aim was to describe the incidence and lesions caused by metazoan and protozoan parasites in Didelphis virginiana opossums in Mexico. From 2019 to 2021, twenty D. virginiana were collected from the state of Colima, Mexico. Post mortem, parasitological, and histopathological studies were performed to identify and describe their lesions and findings. All opossums(20/20) presented at least one type of parasite of the twelve found; the most abundant were nematodes 58.33% (7/12) Didelphostrongylus hayesi, Turgida turgida, Cruzia sp., Viannaia sp., Trichuris didelphis, Trichostrongylidae and Gnathostoma sp. Protozoa 25% (3/12), including Sarcocystis sp., Besnoitia sp., and Sarcocystis sp. A single specimen of Mathevotaenia sp., 8.3% (1/12), and Paragonimus mexicanus 8.3%, were identified (1/12). The most affected systems were the digestive, respiratory, and musculoskeletal. The most abundant parasites were Turgida turgida (20/20) 100%, Cruzia sp., (16/20) 80%, and Viannaia sp. (6/20) 30%, followed by Sarcocystis sp. cysts, (6/20) 30%. The associated parasitic lesions were: D. hayesi produce eosinophilic granulomatous bronchopneumonia, P. mexicanus eosinophilic focal granulomatous pneumonia, and Besnoitia sp., focal eosinophilic lymphoplasmacytic interstitial pneumonia. Gnathostoma and T. turgida caused severe eosinophilic granulomatous focal gastritis. Viannaia sp., Sarcocystis sp., Mathevotaenia sp., and Trichostrongylidae; caused diffuse eosinophilic mucosal enteritis. Cruzia sp., and T. didelphis, induced diffuse eosinophilic mucosal typhlitis. Sarcocystis sp. cysts were detected in the cytoplasm of muscle fibers without histological changes. ABSTRACT Mexico 201 2021 D Colima mortem parasitological findings opossums20/20 opossums2020 20/20 20 opossums(20/20 found 5833 58 33 58.33 7/12 712 7 12 (7/12 sp didelphis 25 3/12, 312 3/12 , 3 (3/12) 83 8 8.3 1/12, 112 1/12 1 (1/12) 1/12. . digestive respiratory musculoskeletal 2020 (20/20 100 100% 16/20 1620 16 (16/20 80 80% 6/20 620 6 (6/20 30 30% bronchopneumonia P pneumonia T gastritis enteritis typhlitis changes 202 opossums20 opossums20/2 opossums202 20/2 2 opossums(20/2 583 5 58.3 7/1 71 (7/1 31 3/1 (3/12 8. 11 1/1 (1/12 (20/2 10 16/2 162 (16/2 6/2 62 (6/2 opossums2 opossums20/ 20/ opossums(20/ 58. 7/ (7/ 3/ (3/1 1/ (1/1 (20/ 16/ (16/ 6/ (6/ opossums(20 (7 (3/ (1/ (20 (16 (6 opossums(2 ( (3 (1 (2 opossums(