31.   Even if a pilot vaccine is developed, it would still take months to produce a commercial one in sufficient amounts to provide widespread protection.

32.   Even though infected people do not produce effective antibodies, scientists hoped they could develop a vaccine that would do what the body alone could not.

33.   Following the discovery that chimps can develop AIDS, several chimps have been infected with the strains with the hope of developing a vaccine for humans.

34.   From Ames, the sample was sent to the U.S. Army Medical Research Institute for Infectious Diseases at Fort Detrick, Md., which was developing a vaccine.

35.   He said scientists already have developed a vaccine for meningitis C, one of the last childhood killers, and are working on a vaccine to fight cholera.

36.   He was appointed late last year to lead the committee, whose mission is to energize the frustrating effort to develop a vaccine against the disease.

37.   He said the city needed more firms like Avax Technologies Inc., which is developing cancer vaccines.

38.   Henderson said the older vaccine was developed from virus grown on the skin of live calves.

39.   If a laboratory vaccine can be developed, the fastest a commercial vaccine could be produced would be about six months.

40.   In addition, there has been a dramatic drop in the incidence of diseases for which vaccines have been developed.