Swine Flu Update: April 28, P.M. – Mexican Pig Farm Source, U.S. Cases Rise, More Travel Restrictions to Mexico Worldwide
- Pig farm seen as source – Houston Chronicle
- New infections intensify travel fears – Reuters
- Flu spreads to 7 countries – New York Times
- CA Governor declares flu emergency – Los Angeles Times
- Worldwide response – BBC
- Pandemic plans stepped up – Guardian (U.K.)
- Experts study flu’s variations – Washington Post
