11.   The canarypox in the AIDS vaccine is a weakened form of canarypox virus that has been used to develop an experimental vaccine against rabies.

12.   The oral Sabin polio vaccine was a weakened form of the poliovirus.

13.   Using real HIV, even in a severely weakened form, would be far too risky.

14.   Using a weakened form of a virus is an accepted practice in medicine.

15.   Essentially a weakened form of the wild measles virus, the Edmonston B vaccine is no picnic.

16.   In a weakened form, it could then make life miserable for residents all the way up to Maine.

17.   Many, though, worry about giving healthy people even a weakened form of the AIDS virus, since it might cause cancer, immune suppression or even AIDS.

18.   On Saturday clouds will begin to increase late in the day with scattered rain showers as the cold front approaches from the west but in a much weakened form.

19.   The El Nino weather phenomenon, which caused thousands of deaths during its last appearance, is returning in weakened form, United Nations scientists predicted Tuesday.

20.   The strike appeared to be holding, although in a somewhat weakened form.