21.   A. Infected mosquitoes are the primary source for West Nile virus.

22.   Also thriving are mosquitoes.

23.   But above all, what strikes many entomologists is that mosquitoes are enormously adaptable to new threats and environments.

24.   But for millions of people, including thousands in this country each year, the mosquito is far more than a pest.

25.   But mosquitos are tough customers.

26.   But mosquitoes are still a problem locally.

27.   But our mosquito is unaware of all this.

28.   But the mosquitoes were so bad that the game was called in the second inning.

29.   Control of dengue fever is relatively easy, since the mosquito is particularly fastidious and not a strong flyer, Oliveros said.

30.   Cuban flags, on both sides of the Straits of Florida, are as abundant as are mosquitoes in August.