The impact was mainly on "Plasmodium vivax" malaria. A difference between the susceptibility to "Plasmodium vivax" malaria has been reported. One possible is the female "Anopheles" mosquito which serves as a vector for "Plasmodium vivax". Limited data suggest that malaria caused by "Plasmodium vivax" is also more severe during pregnancy. In 2012, MAP published the first global maps for "Plasmodium vivax" endemicity. It is primarily active against "Plasmodium falciparum", but also against "Plasmodium vivax". Type O is only known to occur in "Plasmodium vivax" at present. It is the primary vector of vivax malaria ("Plasmodium vivax") in many regions. "Anopheles sundaicus" and "An. subpictus" are important vectors of "Plasmodium vivax". These species appear to be more closely related to "Plasmodium malariae" than to "Plasmodium vivax". There has been at least one case, however, attributed to "Plasmodium vivax". Plasmodium vivax is a protozoal parasite and a human pathogen. Plasmodium vivax lasted until 1958 in the polders of Belgium and the Netherlands. "Plasmodium vivax" can cause a more unusual form of malaria with atypical symptoms.