August 1, 2007

West Nile Virus Epidemic Continues

mosquito caption 480A 14 percent increase in reported cases of West Nile Virus neuroinvasive disease (WNND) last year suggests that the West Nile Virus (WNV) epidemic is here to stay. The number of WNND cases reported to the Centers for Disease Control and Prevention (CDC) rose to 1,491 last year – the highest number reported since 2003. The west-central states and Idaho hosted the majority of human WNV disease cases and Washington reported its first human cases. This increase in WNV activity across the United States emphasizes the need for continued surveillance, research, and mosquito control. Click here for the CDC’s 2006 West Nile Virus activity report.


Malaria Rates Increase in 2005 

The Centers for Disease Control and Prevention (CDC) saw an increase of about 15 percent in reported malaria cases in 2005. Most of the increase resulted from cases from the Americas and Asia. It is unclear, however, whether this is due to better reporting or an increase in travel to these areas. Among travelers, those returning from West Africa had the highest case rates.

Only 18 percent of those who acquired malaria while traveling had followed a CDC-recommended chemoprophylaxis regimen. See

Click here for the CDC’s 2005 malaria surveillance summary.

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