51.   Smallpox vaccine, they say, should be used only in the event of a smallpox outbreak.

52.   Stocks of smallpox vaccine have to be refrigerated.

53.   The administration eventually hopes to stockpile enough smallpox vaccine to treat every American.

54.   The animal research should allow the CDC to test new smallpox vaccines as well.

55.   The contract also positions Acambis to become the sole supplier of smallpox vaccine worldwide.

56.   The Centers for Disease Contol and Prevention, meanwhile, has awarded a contract to Oravax, a company in Cambridge, Mass., to produce smallpox vaccine.

57.   The current recommendation is that smallpox vaccine be given only to the small number of scientists and laboratory workers who work with smallpox and closely related viruses.

58.   The federal government recently announced plans to stockpile enough smallpox vaccine to treat all Americans, if necessary.

59.   The decision to pursue more stocks of smallpox vaccine came as fears of attack with another biological agent, anthrax, spread across the country.

60.   The government owns all smallpox vaccine, which it classifies as investigational.