The term "plague" is usually associated with the Black Death of the 14th Century, which destroyed a fourth of Europe's inhabitants, or the Great Plague of London, which killed 70,000 people in 1665. Surprised last week were the readers of Science and Science News Letter to find that seven States in the western U. S. are plague-stricken.* Not humans, but thousands of rats and squirrels are the victims. The situation, however, is serious, since the disease is readily transmitted from animals to man by fleas. Five human cases of plague have appeared this year,...
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