1.   Although West Nile virus mainly infects birds, it can be transmitted to humans by mosquitoes.

2.   Back at the county health department, the blood is centrifuged and refrigerated, then shipped to a lab in Raleigh to check whether the birds are infected.

3.   Healthy birds apparently are infected when they come into contact with sick birds or objects contaminated by them.

4.   The virus infects birds that roost near freshwater swamps, where the swamp mosquito Culiseta melanura dwells.

5.   Although most live poultry in Hong Kong is imported from China, it is unclear when and where the birds were infected, Fukuda said.

6.   New York health officials have now found seven birds infected with West Nile.

7.   The rare strain of flu virus caught by the boys was previously previously thought to infect only birds.

8.   The virus has long been known to infect birds, but it jumped to humans for the first time this year.

9.   The virus, carried by house mosquitoes, touched off a scare last fall after killing seven New Yorkers and infecting birds in Connecticut.

10.   The virus has sometimes infected migratory birds but Dr. Margaret Chan, director of health, said there is no evidence they are involved in the current outbreak.

v. + bird >>共 504
kill 5.77%
see 3.12%
find 3.06%
attract 2.30%
feed 2.30%
keep 2.24%
watch 1.94%
protect 1.82%
hear 1.82%
release 1.53%
infect 0.65%
infect + n. >>共 341
people 10.43%
human 6.98%
cell 4.25%
animal 3.45%
patient 3.37%
person 2.81%
computer 2.65%
child 2.25%
wound 2.00%
woman 1.76%
bird 0.88%
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