Infection Control, Pediatrics, Pulmonary Medicine, and all inpatient and outpatient units. SUMMARY

information regarding the ongoing investigation of swine influenza A (H1N1) virus infections being conducted by the Centers for Disease Control and Prevention (CDC). The guidance in this advisory only applies to providers seeing patients outside of New York City. For guidance related to providers seeing patients in New York City, see the New York City Department of Health and Mental Hygiene Advisory at: www.nyc.gov/health/nycmed. This information is based on currently available information, and is interim and subject to change as additional information becomes available. • Swine influenza A (H1N1) has been diagnosed in patients in California, Texas, and Mexico. • Cases were first identified when specimens were determined to be positive for influenza A but could not be subtyped with standard methods. Subsequent subtyping at CDC determined that patients were infected with swine influenza A (H1N1). • For all patients presenting with acute respiratory illness, NYSDOH requests that providers obtain recent travel histories to affected areas and test patients meetin