A volunteer immune to Panamanian cutaneous leishmaniasis was found to be immune to L. mexicana infection. A volunteer immune to L. mexicana infection was found to be completely susceptible to Panamanian cutaneous leishmaniasis. It seems that L. mexicana and the causative agent of Panamanian cutaneous leishmaniasis are antigenically distinct. The relationship between the Panamanian organism and L. guyanensis is still to be ascertained.
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Lainson et al. (1966) studied this question.
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