SF is the third adolescent case in adjacent CA counties: Alameda confirmed with unknown source, and Marin presumptive but could very well have been raw milk. How is this different from when community transmission of Swine flu was discovered in 2009, Helen?

The third adolescent presumed bird flu case in adjacent CA counties? SF, Alameda, and Marin--the latter could well have been raw milk. Migratory birds in the bay or time to worry about underlying H2H? Is contact tracing reliable with so many possible sources and voluntary participation?