LIVING IN THE NORTHERN UNITED STATES, ONE DOESN'T EXPECT TO CONTRACT ESSENTIALLY TROPICAL DISEASES LIKE MALARIA (see Lancet's chart on left), and yet, would you be surprised that, in the early-to-mid-19th century, Norwegian pioneers settling in Wisconsin - as a rule - feared malaria significantly more than cholera? Malaria actually remained endemic in much of the United States (more in the South, obviously) through the 1940s, whereas today in a state like Wisconsin, virtually all cases that present themselves (roughly a dozen a year) feature travelers just back from tropical locations. But that's changing, per a great WAPO in-depth story of a few days back ...
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