11.   Many vets believe that vaccines would not be as effective at controling rabies as our present quarantine laws.

12.   As the England rugby squad prove, the new vaccine is straightforward.

13.   Researchers believe the vaccine is a major breakthrough in tackling a form of pneumonia, meningitis and septaecemia, caused by the microorganism streptococcus pneumoniae.

14.   It sounds as if the virus is com, is impossible to hold down, could there be a vaccine created for such a changing virus?

15.   Is there a chance if it changes so rapidly, that there could never be a vaccine for the whole strain, for the whole H I V virus.

16.   How effective is the vaccine itself?

17.   Although Harrison of the FDA acknowledged that the pertussis vaccine was not risk-free, she said it was important to consider the risk of not vaccinating.

18.   Also in early stages are vaccines against cocaine, methamphetamine, and PCP, an anesthetic drug called phencycladine that is often abused.

19.   Also uncertain is whether the vaccine is safe for those with arthritis or undetected Lyme disease.

20.   Although these vaccines are safe for human use, it is not yet clear how effective they are, researchers say.