41.   A preliminary study sponsored by the federal government has found that a genetically engineered flu vaccine is as effective as the one now in use.

42.   A preventive vaccine is available and is now being administered on an emergency basis in the region.

43.   A report by the National Institutes of Health cautions that finding am effective AIDS vaccine is a tremendous undertaking.

44.   A second is to determine the primate species from which the vaccine was prepared.

45.   A vaccine against chickenpox is due to be released soon.

46.   A vaccine for HIV is probably five to eight years away from being commercially available, said Dr. Gregg Lucksinger, a partner at the Austin research clinic.

47.   A vaccine is available to prevent the disease in domesticated animals.

48.   A vaccine would also be a cheap countermeasure.

49.   A. The only vaccine is in limited supply and is available now only to the military.

50.   A vaccine is available for livestock, and the government plans to immunize herds near the affected zone.