1.3.2. INDOOR AND OUTDOOR BITING ACTIVITIES OF MALARIA VECTORS IN TH...

4.1.3.2. Indoor and outdoor biting activities of malaria vectors In this study, the biting activity of mossquitoes was higher outdoor than indoor in both the village and in the field. This finding is also consistent with other domestic and international studies. However, indoor or outdoor biting activities vary depending on the time and place. Some other studies show that the indoor biting activity is higher than outdoor activity. According to Krajana (2014) in Thailand, An. dirus had the ratio of indoor biting/outdoor biting was 9:8 [83]. In Northern Thailand, the indoor biting habit of An. dirus was not much more than outdoor [113], while in Cambodia [70] and in Central Vietnam, An. dirus was caught indoor 2-5 times more than outdoor [43]. A survey conducted in Van Canh district as well as in central Vietnam showed that An. dirus was more active outdoor from 18h to 22h and more active indoor from 22h to 5h, so the indoor and outdoor biting density was equal for the whole night [35].