August 22, 2012 — An outbreak of West Nile virus infections that has claimed more than 3 dozen lives this year could shape up to be worst ever, the US Centers for Disease Control and Prevention (CDC) announced today. The number of reported cases jumped in just a week's time from 693, as of August 14, to 1118, as of August 21, according to the agency. During that same period, the number of reported deaths rose from 26 to 41. "We're in the midst of one of the largest outbreaks of West Nile virus ever seen," said Lyle Petersen, MD, MPH, director of the CDC's Division of Vector-Borne Infectious Diseases, in a press briefing today. The number of disease cases reported in 2012 through August 21 is the highest for this time frame since the mosquito-borne virus was first detected in the United States in 1999. West Nile virus infections typically peak in mid-August, but the CDC expects the case count to continue rising through the end of September because of delay...