The Center for Disease Control (CDC) has added a new color to its flu activity level chart, indicating areas with very high levels of respiratory illnesses.
Purple on a map shows the highest level of ILI activity. According to the CDC, the system monitors respiratory illness, including fever plus a cough or sore throat, also referred to as ILI.
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According to week 43, the District of Columbia, Alabama, South Carolina and Tennessee are deemed very high for influenza-like illnesses.
For more information on ILI activity levels, click here.