Ever since it made its notorious globe-girdling trip in 1918, influenza has remained the most peripatetic of plagues. A 1968 epidemic afflicted more than 30 million in the U.S. alone; similar, though considerably less serious outbreaks of the disease erupted in 1972 and 1973. Now the flu is once again making the grand tour. The disease, which causes the all too familiar headache, upset stomach, coughing and fever, has struck hard in Eastern Europe and turned up in the western part of the Continent. It has also gained a foothold in the U.S., where,...
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