Officials: West Nile outbreak 1 of largest in US
Published On: Aug 23 2012 07:22:42 AM EDT
Updated On: Aug 23 2012 08:23:03 AM EDT
There are four times the usual number of cases in the current West Nile outbreak in the U.S. and it's too early to say how bad it will be at year's end, federal health officials said.
