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Plasmodium ovale species in Papua New Guinea--lest we forget.

The microscopical diagnosis of Plasmodium ovale infection is reviewed and its similarity to Plasmodium vivax emphasized. Its presence in Papua New Guinea has been recognized for many years, from a time not long after Stephens first described the species in 1922, but it is rarely reported. There is no doubt of its presence in Papua New Guinea, together with P. falciparum, P. vivax and P. malariae, but its exact prevalence and distribution has not been determined.