1. Outbreak of swine-origin influenza A (H1N1) virus infection—Mexico, March-April 2009;MMWR Morb Mortal Wkly Rep,2009
2. Swine influenza A (H1N1) infection in two children—Southern California, March-April 2009;MMWR Morb Mortal Wkly Rep,2009
3. Update: swine influenza A (H1N1) infections—California and Texas, April 2009;MMWR Morb Mortal Wkly Rep,2009
4. Swine-origin influenza A (H1N1) virus infections in a school—New York City, April 2009;MMWR Morb Mortal Wkly Rep,2009
5. Update: infections with a swine-origin influenza A (H1N1) virus—United States and other countries, April 28, 2009;MMWR Morb Mortal Wkly Rep,2009