Reuters: U.S.: West Nile cases in U.S. up nearly a third in latest week: CDC

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West Nile cases in U.S. up nearly a third in latest week: CDC Sep 12th 2012, 16:16 Wed Sep 12, 2012 12:16pm EDT (Reuters) - The number of U.S. cases of West Nile virus climbed by nearly a third in the latest week as the spread of mosquito-borne disease accelerated and threatened to make the 2012 outbreak among the most severe on record, government figures showed on Wednesday. So far this year, 2,636 cases have been reported to federal health officials, up from 1,993 reported the week before, the Centers for Disease Control and Prevention said in its weekly update of outbreak data. A total of 118 people have now died from the disease, compared with 87 reported one week ago. The disease has been reported in people, birds or mosquitoes in 48 U.S. states, so far absent only in Alaska and Hawaii. About 40 percent half of all human cases are in Texas, the CDC said. Two-thirds of the cases have cropped up in six states. Of the cases reported to the CDC this year, 1,405, or 53 percent, are of the severe neuroinvasive form of the disease, which can lead to meningitis and encephalitis. The milder form of the disease causes flu-like symptoms and is rarely lethal. West Nile outbreaks tend to be unpredictable. Hot temperatures, rainfall amounts and ecological factors such as the bird and mosquito populations have to align just right to trigger an outbreak like the one this year. (Reporting by Paul Thomasch; Editing by Bill Trott) Link this Share this Digg this Email Reprints

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