You think scientists would do something about it if they knew who to prevent it.
West Nile Virus is a mosquito-borne disease. It reproduces it self when a mosquito with the virus bites a bird, birds are killed by WNV but can also give of the virus if another mosquito bites the infected bird, the reproducing the disease.
it would prevent tumor cells from reproducing.
It's a myth. Mosquito nets prevent malaria.
You should keep clean your surrounding area and do not store waste water here and there in a small pit. And you can use mosquito nets and Mosquito Repellent.
Insect repellent is highly thought of.
You prevent yellow fever by preventing people from being bitten by an infected mosquito. You can do this to a degree by use of mosquito netting, mosquito repellent, etc. Historically, it was most effectively done by eliminating mosquito breeding ponds, thus reducing or eliminating the population of mosquitoes available to be infected. An effective vaccine against yellow fever is also available.
it would prevent tumor cells from reproducing.
Technically, no. A mosquito has 47 teeth and one long "sucker" (the proboscis). Only the female mosquito bites, and only because blood contains the nutrients required for them to reproduce and lay eggs. So, a male mosquito and the female (when it isn't reproducing) will drink nectar. They use their teeth to get into a flower to eat the nectar, they don't really eat the flower.
Get a maleria injection or take tablets
There are three basic ways to prevent malaria. Vector control- controlling mosquito populations (which carry malaria) Personal mosquito protection- Using insect repellent, screens on windows, and mosquito nets (treated with insecticide), and other measures to prevent mosquito bites. Antimalarial treatment For more information see the related link
I am not sure, but I heard mint can prevent bugs. Here is a secret, if you do get a mosquito bite, run it over with hot water. It may sting a little, then run it with cold water. Your bite may be numb for a few hours.
The insecticide DDT will sterilize a German cockroach. The insecticide will prevent the cockroaches from reproducing and will eventually kill them.