21.   The current vaccine shortage became apparent last fall when manufacturers unexpectedly decreased production, according to CDC.

22.   The regular doses of both the new vaccine and the current vaccine produced about the same amount of antibodies.

23.   This chemical trickery, they say, helps explain why the current Lyme vaccine has not been more protective.

24.   This chemical virtuosity, they say, helps explain why the current Lyme vaccine has not been more protective.

25.   WHOOPING COUGH VACCINE APPROVED The FDA approved a vaccine to prevent whooping cough in infants that has fewer side effects than the current vaccine.

26.   Current vaccines are protective, but they have to be changed each year because the virus itself changes constantly.

27.   The current vaccine protects against the bubonic form of plague but not the inhaled variety, which is feared as a terrorist weapon.

28.   The current vaccine candidates were based on injecting the antigens themselves into the body.

29.   The current vaccine lasts three to five years.