91.   Most experts believe that genetically stable flu viruses reside harmlessly in birds, but that occasionally one of these bird viruses infects pigs.

92.   Ms Lok said the medical staff in these units faced the highest risk of direct contact with patients and could easily be exposed to the bird flu virus.

93.   Mrs Wei made the announcement after she visited the market, which is suspected to have been one of the sources of the deadly bird flu virus.

94.   Nobody knows if the flu virus will develop resistance to long-term Tamiflu use, something the FDA will monitor.

95.   Researchers create flu virus in laboratory in work that could lead to new vaccine.

96.   Researchers immunized the mice with three injections at three-week intervals, and exposed them three weeks later to a large, potentially lethal dose of flu virus.

97.   Shenzhen farmers, however, denied reports that a large number of their chickens had succumbed to the bird flu virus.

98.   Rural residents complained that dogs and rats were getting at the carcasses, prompting fears that they might spread the bird flu virus.

99.   Scientists have to devise a new vaccine annually to meet changes in the strains of the flu virus.

100.   She said the timing of the order should not be seen as an indication that the battle against the new flu virus has become more intense.