The amount represents 42 percent jump in the number of cases and a 61 percent increase in the number of deaths in a week.
"The number of human cases also marked the highest increase in transmission of the virus, according to calculations by the last week of August since the virus was first detected in the country in 1999," said the health center on Friday (31/8) morning.
But the record of the year, in 2003 there were 9862 cases of West Nile Virus were reported in the United States, and 2002 faced more than 4,100 cases, including more than 260 deaths.
More than 70 percent of cases have been reported from six states - Texas, South Dakota, Mississippi, Oklahoma, Louisiana and Michigan. Texas is a state that faces most cases, with 45 percent of cases of infection and 31 deaths across the state.
Based on previous experience, federal health officials did not expect Hurricane Isaac, who on Wednesday (29/8) fell to Tropical Storm strength again, have a huge impact on the spread of the virus this year.
West Nile Virus is a mosquito-borne disease that is generally found in temperate and tropical regions and can lead to serious neurological disease in some cases. Symptoms are caused by a virus that covers the body feels weak, dizzy, nausea, headache, and fever are sudden.
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