[MSAR] West Nile Virus

Una Smith una at lanl.gov
Wed Jan 7 13:42:12 EST 2004


Current data on West Nile Virus from the US Department of
Agriculture (http://www.aphis.usda.gov/vs/nahps/equine/wnv/)
includes the following statistics for equine cases:

Year	Reported
----	--------
1999	      25
2000	      60
2001	     738
2002	   15257
2003	    4554

The decrease from 2002 to 2003 is especially interesting in
light of the fact that the geographic spread of the virus
was larger in 2003 than in 2002.  Is the vaccine responsible
for this marked decrease?  Hard to say;  correlation is not 
proof of causation.

	Una Smith
	Santa Fe County Sheriff's Posse, in New Mexico




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