Diseases & National Health Programme
Which of the following is not true regarding Aedes mosquito?
|A||It bites repeatedly|
|B||It transmits dengue|
|C||Eggs cannot survive for more than one week without water|
|D||Incubation period in mosquito is 7-8 days|
(Ref: Park 20th edition; Pg-715)
a. Under favourable conditions, the egg stage of mosquitoes lasts for 1-2 days (Acc. To Park) but the eggs of aedes can survive in water for almost a year.
b. The extrinsic IP ie the IP in mosquito is 8-10 days not 7-8 days so this might as well be the option but since the figures are close to each other we go with option C as the answer. The other two options regarding Aedes aegypti are correct.
Some important facts about Aedes:
a. Aedes mosquito are easily distinguished by white stripes on their black body, hence also known as ‘tiger mosquito’.
b. It is widely distributed in India & is responsible for transmitting Dengue, DHF, Yellow fever (not in India), chikungunia, rift valley fever & filarial (not in India)..
c. It breeds in artificial accumulations of water in and around human dwellings, such as water found in discarded tins, broken bottles, fire buckets, flower pots, coconut shells, earthen pots, tree holes and the like.
d. It lays eggs singly which are cigar shaped. The females are fearless biters & bite chiefly during the day.
e. They do not fly over long distances- usually less than 100 meters. Hence, under IHR all airports & seaports are kept free from all types of mosquitoes for a distance of 400m around their perimeter. The aedes aegypti index should be kept at zero at all ports.