Chloroquine resistant Plasmodium falciparum on the island of Flores, Indonesia.

The in vitro sensitivity of Plasmodium falciparum to chloroquine was studied in parasites from 45 children on the island of Flores, Indonesia. The micro in vitro culture technique and a 12-volt battery-operated field incubator were found to be well suited to the field situation encountered. Parasites from seven children (15.6%) were resistant to chloroquine in vitro: two at 8 pico-moles of chloroquine, two at 16 pico-moles, and three at 32 pico-moles. This is the first report of chloroquine resistant from Flores.