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In the United States (US), a total of 11 human cases of plague have been reported since 1 April 2015. Cases have been identified in six states: Arizona (2), California (1), Colorado (4), Georgia (1), New Mexico (2), and Oregon (1).
The cases in California and Georgia were linked to exposures at or near Yosemite National Park in the southern Sierra Nevada Mountains of California. Nine of the 11 patients were male; age range 14–79 years. Three of the cases had a fatal outcome.
Between 2001–2012, a range of 1-17 human cases of plague were reported annually in the US; it is unclear why the number of cases in 2015, is higher than normal.
( Via Morbidity and Mortality Weekly Report (MMWR) 25 Aug 2015 - accessed 26/08/15)
The steps the public can take to reduce exposure to human plague include:
Early symptoms of plague may include high fever, chills, nausea, weakness and swollen lymph nodes in the neck, armpit or groin. Travellers who develop these symptoms should seek immediate medical attention and notify their health care provider that they have been camping or out in the wilderness and have been exposed to rodents and fleas.