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Toxoplasmosis is a common zoonotic infection with various transmission mechanisms and wide distribution worldwide. Its probability of causing disease is related to alterations in the immune system as well as the parasite’s virulence. This study presents four cases of patients from rainforest areas in Colombia who did not have any known immunosuppression but do have a diagnosis of toxoplasmosis with pulmonary involvement, confirmed by serology. One of them also developed hypoxemic ventilatory failure and myocarditis. This outbreak of toxoplasmosis occurred in military personnel after coming into contact with common sources of exposure in the Colombian Amazon during a military training exercise. This article includes the diagnostic process, clinical manifestations, treatment, and importance of the parasite’s genotypic variants.