The CDC reported that 1,118 people have been infected in 38 states due to the West Nile virus this year. As of Wednesday, 42 people had died. The outbreak is on track to be the worst since the disease was detected in the U.S. in 1999. The cause of the increase is unclear, but warm weather could be a contributing factor, the CDC’s Dr. Lyle Petersen said. HealthDay News (8/22), CNN (8/23)