Nothing can ruin a vacation like a bout of vomiting, diarrhea, and stomach cramps. Noroviruses have become notorious for sending hundreds of cruise ship passengers at a time running for their respective bathrooms and for steering entire ships back to port early.
Back on dry land, noroviruses also have a big impact on people's health. The CDC estimates that noroviruses are responsible for more than half of all food-borne disease outbreaks each year. And noroviruses are the most common cause of diarrhea...
People usually get plague from being bitten by a rodent flea
that is carrying the plague bacterium or by handling an infected animal.
Millions of people in Europe died from plague in the Middle Ages, when human
homes and places of work were inhabited by flea-infested rats. Today, modern
antibiotics are effective against plague, but if an infected person is not
treated promptly, the disease is likely to cause illness or death.
Wild rodents in certain areas around the world are infected with plague.
Outbreaks in people still occur in rural communities or in cities. They are
usually associated with infected rats and rat fleas that live in the home. In
the United States, the last urban plague epidemic occurred in Los Angeles in
1924-25. Since then, human plague in the United States has occurred as mostly
scattered cases in rural areas (an average of 10 to 15 persons each year).
Globally, the World Health Organization reports 1,000 to 3,000 cases of plague
every year. In North America, plague is found in certain animals and their
fleas from the Pacific Coast to the Great Plains, and from southwestern Canada
to Mexico. Most human cases in the United States occur in two regions: 1)
northern New Mexico, northern Arizona, and southern Colorado; and 2)
California, southern Oregon, and far western Nevada. Plague also exists in
Africa, Asia, and South America (see map).
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Campbell GL, Dennis DT. Plague and other Yersinia
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