These symptoms can last several weeks, and some damage to the brain and nerves may be permanent. These severe symptoms can include disorientation, coma, convulsions, tremors, and paralysis. A small number of people (about 1 in 150) will develop severe illness.
In some people, fatigue may linger for several weeks. Most of the symptoms last for a few days.
People typically get symptoms 4 to 10 days after they are bitten by an infected mosquito. Although it's not clear how the virus came to our area, experts believe West Nile virus disease is now a seasonal epidemic in North America that flares up in the summer and continues into the fall. Before 1999, West Nile virus had never been found in the Western Hemisphere. West Nile virus disease is a potentially serious illness spread by mosquitoes. Note: Aspects of the original outbreaks and investigations have been altered to fit the format and length of this application. But because much of the mining activities continue, the outbreak has not ended. CDC, Nigerian authorities, Doctors Without Borders, and other organizations have worked hard to provide chelation therapy and to repair the environment by removing contaminated soil. Scientists have called this the worst case of mass lead poisoning in modern times.Ĭonditions were especially bad because much of the mining was done in family compounds, where children were exposed to huge amounts of lead through dust and other means. The cause of the outbreak was traced to what is called "artisanal gold mining," or small-scale mining using primitive tools and little, if any, protective equipment. CDC scientists raced to the scene, where tests quickly showed that the children (and some adults) had severe lead poisoning. In May 2010, Doctors Without Borders contacted the CDC and other groups after it discovered that a staggering number of children were dying in villages in a remote part of Zamfara Province. This fictional scenario is based on a real-life outbreak that is still claiming lives in Nigeria. Based on the epi curve, which of the following do you think is happening?