An in vivo chloroquine sensitivity study in relation to low transmission potential and imported malaria in Kerala.

The study highlights the presence of chloroquine resistant Plasmodium falciparum strains in Kerala state, India for the first time. The emergence of chloroquine resistant P. falciparum in a low transmission area is dependent on the imported cases while build up of resistance is mainly due to persistence of resistant parasites which have more opportunities for transmission.

An in-vitro profile of the action of four antimalarials on indigenous cases of Plasmodium falciparum malaria in Karnataka.

In view of the emergence of chloroquine resistant Plasmodium falciparum from more and more geographical areas profiling of the responses to other available antimalarials by in vitro methods have become essential. A preliminary study undertaken in two Primary Health Centres of Karnataka State, India show the presence of strains of P. falciparum resistant to chloroquine and amodiaquine. The response for amodiaquine was poor as compared to chloroquine. The isolates were, however, sensitive to mefloquine and quinine.

Localization of the focus of origin of resistance in Plasmodium falciparum.

An attempt has been made to identify the focus of origin of Plasmodium falciparum resistance. Several factors have been analysed and the importance of mean parasite recrudescence time (M.P.R.T.) in the identification of focus of origin of resistance is highlighted.