71.   Scientists are developing another test which they say could be applied before polio vaccines are tested on animals, leading to a possible reduction in animal use.

72.   Take the oral polio vaccine, a potent live-virus vaccine but one that carried a small risk of actually causing polio.

73.   Tens of thousands of health officials and volunteers Saturday began administering polio vaccine to children across this vast nation that remains the last stronghold of the crippling disease.

74.   That finding led to the development of polio vaccines.

75.   The inactivated polio vaccine, or IPV, is a stronger version of the first polio shot, which was invented by Dr. Jonas Salk, who recently died.

76.   The monkeys also help screen polio vaccines and probe the effect of chemicals such as PCBs and stimulants such as caffeine.

77.   The polio vaccine all but eliminated the disease from most countries decades ago.

78.   The mothers said that polio vaccine was given in oral drops three times, but it was all right to give more drops.

79.   The polio vaccine of the same batch has been withdrawn from hospitals in the state, the news agency said.

80.   The polio vaccine works by spurring the immune system to make protective antibodies.