111.   If after three years results show the vaccine is highly effective, the study will be stopped and all participants on placebos will get the vaccine.

112.   If more vaccine were needed, it would take up to a year to produce it, since there is presently no manufacturing capacity for the product.

113.   If the vaccine is effective, it could substantially alter the debate about how the nation should prepare for a possible attack by terrorists using smallpox.

114.   If so, they say, vaccines are a good deterrent and a relatively cheap insurance policy.

115.   If the vaccine is on target, people have a better chance to ward off those wintertime aches and pains.

116.   If the money comes through, a vaccine could be widely available by the end of the decade.

117.   If the rate of autism is increasing and the MMR vaccine is not to blame, what else might be causing it?

118.   In fact, some researchers doubt this vaccine is strong enough to be effective.

119.   In some cases, she said, the vaccine was stored at the wrong temperature and that some patients were not fully informed of the risks.

120.   Instead the stockpiled vaccines would be available in case of an outbreak.