Word: antigensâ
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...product of more than a decade of development by the National Institute of Allergy and Infectious Diseases, the vaccine is made from purified bacterial antigens???the chemical keys by which the body recognizes invading germs and orders up antibodies against them. The variety used in San Francisco contained antigens from eight of the most common types of pneumococci. Other recent field trials have involved vaccines with as many as 14 different antigens. Surveying these tests, Dr. Robert Austrian of the University of Pennsylvania concludes that the vaccines are safe, at least 80% effective and apparently provide long-term immunity...
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