21.   Nevertheless, the findings may shed new light on earlier studies in which a number of chimpanzees have been injected with experimental AIDS vaccines.

22.   No experimental vaccine has produced the harmful immune responses that some scientists theorized might occur from vaccines.

23.   Pasteur, on the other hand, has aggressively pursued an experimental vaccine that is nearing government approval for a large-scale human study.

24.   Piot also has urged government, industry, researchers and developing countries to expedite testing of experimental HIV vaccines, particularly in areas where they are needed most.

25.   Researchers have now found some success with an experimental genetic vaccine against TB.

26.   Several countries in southern and central Africa are eagerly collaborating with foreign researchers to create or test experimental vaccines.

27.   So far, researchers have been unable to prove the experimental vaccine will successfully halt the spread of rabies among South Texas coyotes.

28.   Some volunteers will be injected with an experimental vaccine and others with a placebo.

29.   Such proteins are generally considered the most important indication of protection from an experimental vaccine.

30.   Surprisingly, this preliminary work has already led to an experimental vaccine that, in guinea pigs at least, seems to thwart the virus.