1.   Cohen said the potential danger was low, noting that the mosquito season had passed.

2.   Experts say it is too early in the mosquito season to estimate how far the virus will spread this year or how many people are likely to become infected.

3.   The mosquito season begins in May and continues up to November, with the most critical months July, August and September.

4.   This is particularly important during very cold weather or mosquito season.

5.   With the beginning of the summer rains comes the mosquito season in many tropical, low-lying parts of Mexico.

6.   A third round of testing is planned before the mosquito season officially ends before the first frost of the year, he said.

7.   For instance, she said, other mosquitoes that are pests to humans might adapt so that the troublesome mosquito season could grow longer and expand further north.