1. Health Alert #11: swine influenza update- April 25, 2009;New York City Department of Health and Mental Hygiene
2. Swine-origin influenza A (H1N1) virus infections in a school - New York City, April 2009;Centers for Disease Control Prevention;MMWR Morb Mortal Wkly Rep,2009
3. Daily attendance rates - all schools are open, reopened schools;New York City Department of Education
4. Statement from Governor David A. Paterson on the closing of additional New York City schools due to H1N1–5/15/09;New York State Department of Health
5. Community strategy for pandemic influenza mitigation;Centers for Disease Control and Prevention