1.   But researchers say that in places like Botswana and South Africa, where infection rates are high, even a partly effective vaccine can make a big difference.

2.   He was negative, but the vaccine would make him test positive.

3.   One vaccine has made it to the second of the three stages of trials that are needed before it could be marketed.

4.   Some dentists have come to be skeptical that a vaccine will make it into widespread use.

5.   Such a vaccine would make it possible to differentiate between infected and vaccinated animals.

6.   The Department of Defense owns all the vaccine the company makes, so it would also have to give permission for the vaccine to be used.

7.   The pig was selected in part because vaccines made from porcine zona pellucida work on more species than vaccines made from the zona pellucida of other animals.

8.   The oral vaccine made the job easier as it required only two drops into the mouths of children.

9.   Another HIV vaccine made with DNA and a booster using the smallpox vaccine has been developed in England.

10.   Few cancer vaccines so far have made tumors disappear in cases where the disease has spread in the body, he said.