51.   A vaccine is available to some US soldiers, though not the public.

52.   A working AIDS vaccine is still years away, vaccine experts say.

53.   But Fauci said the new vaccine might not be any safer than the old one.

54.   But he also knows there are no vaccines for other viruses, bacteria, pesticides, fertilizers, oils, greases and pollutants found in floodwaters.

55.   But he and other experts said much more research was needed to be sure that such an attenuated virus vaccine was both safe and effective.

56.   But in the two years the vaccine has been on the market, many doctors have disregarded federal recommendations that most children be immunized.

57.   But many scientists doubt that a killed-virus vaccine is the best way to achieve those goals.

58.   But no vaccine is imminent, and even small advances in treatment are likely to be measured in years, not months.

59.   But now health officials in Cuba say a new AIDS vaccine will be ready for use within two to five years.

60.   But researchers said the tests show that edible, plant-based vaccines are feasible.