Sunday, July 4, 2010
Bye Bye West Nile Virus???
article in MMWR regarding West Nile Virus activity in the US. As shown in the graph, the incidence of WNV neuroinvasive disease (i.e., meningitis, encephalitis, or acute flaccid paralysis) has fallen from its peak in 2002 at slightly over 1.0 case per 100,000 population to 0.2 in 2009. The reason for the falling incidence is unknown, though the editorial comments cite possible factors such as increasing immunity in birds, less reporting of cases by the medical community, or better use of mosquito repellents by humans. Keep spraying the Off!