Oduola A O, Awe O O
Public Health Division, Nigerian Institute of Medical Research, Yaba, Lagos.
J Vector Borne Dis. 2006 Mar;43(1):16-20.
BACKGROUND & OBJECTIVES: Olfactory cues play an important role in the attraction of major disease vectors towards their host. Hence we intend to investigate the contribution of selected parts of the human host on the behavioural biting preference of Culex quinquefasciatus.
Two volunteers were trained to collect host seeking female mosquitoes landing to feed on different parts of the lower limbs. The Cx. quinquefasciatus were collected in paper cups with the aid of a flash-light and aspirator. Each paper cup was labeled to represent the selected parts where the mosquitoes were collected.
The composition of Cx. quinquefasciatus from the total mosquitoes collected showed that Cx. quinquefasciatus was more predominant (90%) over other species present. The average minimum and maximum atmospheric temperature recorded during the night catches were 27 and 29.5 degrees C while the average relative humidity range was 78-81.6%. The behavioural biting preference results obtained showed that the density of Cx. quinquefasciatus mosquitoes preferring the foot region (298) was significantly higher (p > 0.05) when compared with other different parts of the human host such as the ankle, calf and the thigh.
INTERPRETATION & CONCLUSION: The study indicates that the foot region of the human host has a stronger influence in orientating mosquitoes towards the human host. Hence, the exploitation of the characteristic human odour will add to the existing vector control strategies.
嗅觉线索在主要病媒向宿主的趋化过程中起着重要作用。因此，我们打算研究人类宿主特定部位对致倦库蚊行为性叮咬偏好的影响。
训练两名志愿者收集落在下肢不同部位觅食的宿主寻找型雌蚊。借助手电筒和吸虫器将致倦库蚊收集到纸杯里。每个纸杯都做了标记，以代表收集蚊子的特定部位。
从收集到的所有蚊子中，致倦库蚊的占比显示，致倦库蚊（90%）比其他共存物种更占优势。夜间捕捉期间记录的平均最低和最高气温分别为27和29.5摄氏度，平均相对湿度范围为78 - 81.6%。行为性叮咬偏好结果显示，与人类宿主的其他不同部位（如脚踝、小腿和大腿）相比，偏好足部区域的致倦库蚊密度（298只）显著更高（p > 0.05）。
该研究表明，人类宿主的足部区域在引导蚊子趋向人类宿主方面有更强的影响力。因此，利用人类特有的气味将有助于现有的病媒控制策略。
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