As part of an on-going malaria surveillance effort conducted by the Korea Center for Disease Concectration & Prevention (KCDC), a total of anopheline mosquitoes was tested for the presence of Plasmodium vavax 18s protein. Mosquitoes were collected (using black light traps) from 2 quarantine stations (Kimpo branch office of Incheon Airport National quarantine station, Paju city and Sokcho branch office of Donghae National quarantine station, Goseong county), identified to species, and tested by PCR for the presence of P. vivax 18s protein. The quarantine stations is located near de-militarized zone in Republic of Korea . A total of 140 Anopheles bellene, 3 An. lesteri, 153 An. pullus, 238 An. kleini, and 1,523 An. sinensis was tested. Two Anopheles bellene, Seven An. kleini, and Nineteen An. sinensis were positive for P. vivax 18s protein. Anopheles sinensis is the predominent Anopheline mosquito encountered in the northern part of the ROK and is a known malaria vector. Other potential vectors include An. lesteri Baisas & Hu and An. yatsushiroensis Miyazaki. Anopheles bellene haven't been reported as vector of malaria until now. However, in this study, positive results were detected from An. bellene collected at Paju city and Goseong county, 27 May and 22 Jun, respectively. Anopheles bellene as potential vector of P. vivax might be further studied.

The susceptibility of the Blattella germcanica (L.) in the Republic of Korea (ROK) to insecticides was evaluated under laboratory conditions using 12 insecticides currently used by the local public health centers and/or pest control operators in the ROK. The insecticides included seven pyrethroids and five organophosphages. Based on their LD50values, the order of susceptibility of B. germanica adults to the insecticides was chlorpyrifos-methyl, profenofos, and chlorpyrifos with the values of 0.07, 0.29, and 0.88 ㎍/♀, respectively. The least susceptibility was obtained with tetramethrin at LD50 of 7.39 ㎍/♀. In the comparative resistance test, the resistance ratios (RR) of 12 insecticides were compared to each other using field collected B. germanica adults in Seoul between 1993 and 2007. Blattella germanica demonstrated higher RRs to pyrethroids such as λ-cyhalothrin, and low RRs among the organophosphates. Among the pyrethroids, λ-cyhalothrin had the highest RRs of 111 and 129 fold differences at LD50 and LD90 values, respectively. Among the organophosphates, profenofos was observed to have the highest RRs of 4 and 15 fold differences at LD50 and LD90 values, respectively. However, there were no significant differences in susceptibility to tetramethrin, chlorpyrifos, and fenitrothion. Blattella germanica was more susceptible to pyridafenthion showing a 0.7 fold difference in a resistance rate (RRLD50), respectively. Resistance ratio of tetramethrin was low, but susceptibility was also not high.