81.   Even if a vaccine were to be developed, the cost of research and development could far outweigh the revenues the vaccine could generate, said Blair.

82.   Even if she had, there is no guarantee that the vaccines would have been there.

83.   Eight such vaccines are in various stages of development, said another federal agency, the National Institutes of Allergy and Infectious Diseases.

84.   Even with these concerns, researchers generally agree that the vaccine is a major advance for people living in places where there are lots of infected ticks.

85.   Experts agree that the vaccine is not perfect.

86.   Even if all goes well, it could take several years before any therapy or vaccine is in widespread use.

87.   Federal authorities require vaccine makers to show only that a vaccine is effective for a reasonable amount of time, usually one year.

88.   Federal officials say there is no proof yet that killed-virus vaccines are effective in protecting people from smallpox.

89.   Fauci said the vaccine is effective if one receives the shot within four days of exposure.

90.   Flu and pneumonoccus vaccines are available free for Massachusetts residents who go to local boards of health and nationwide, for anyone covered by Medicare Part B.