From the LA Times.

"The results from the second set of mice were not yet complete, but Kramer said about 45% of the traps set in Tuolumne Meadows were successful, up from previous years. In 2007, only 17% of traps were successful; in 2008, 25%.

Some experts have wondered if more deer mice contributed to the Yosemite outbreak, as hantavirus cases in the past have been linked to an abundant population.
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Verum audaces non gerunt indusia alba. - Ipsi dixit MCMLXXII