1.   American vaccines, he said, generally rely on chemical reactions and require several inoculations to be effective.

2.   But veterinary vaccines may carry more serious side effects than the American vaccine for people, they warn.

3.   Friedlander said there was no way of knowing whether the American vaccine would protect against such a genetically changed organism, which probably kills by a different mechanism.

4.   Since they would almost certainly have acquired the American vaccine, some experts believe that the multistrain blend was designed to overcome its defenses.

5.   Six American experts on anthrax vaccines said the Russian vaccine was probably even more effective than the American vaccine in preventing the recipient from falling ill with anthrax.

6.   The American vaccine has protected people who handle goat and sheep wool from cutaneous anthrax, the usually nonlethal form of the disease that attacks the skin.

7.   The Americans also wanted to test whether the microbe could defeat the American vaccine, which is different from that used by Russia.

8.   The American vaccine can cause redness and itching at the site of the injection and sometimes flulike illnesses.

9.   The British vaccine is similar to the American vaccine.

10.   The purpose of such a mixture, Jackson suggested, might have been to overwhelm the American vaccine.