On April 23, several cases of severe respiratory illness laboratory confirmed as swine-origin influenza A (H1N1) virus (S-OIV) infection were communicated to the PAHO. Sequence analysis revealed that the patients were infected with the same S-OIV strain detected in two children residing in California.

On April 24, 2009, CDC reported eight confirmed cases of swine-origin influenza A (H1N1) virus (S-OIV) infection in Texas and California. The strain identified in U.S. patients was confirmed by CDC as genetically similar to viruses subsequently isolated from patients in Mexico.

If H1N1 Flu is suspected, clinicians should obtain a respiratory swab for swine influenza testing and place it in a refrigerator (not a freezer).

Provides interim guidance on appropriate specimen collection, storage, and processing for patients with suspected swine influenza A (H1N1) virus infection.

CDC Briefing on Public Health Investigation of Human Cases of Swine Influenza

CDC Briefing on Public Health Investigation of Human Cases of Swine Influenza April 30, 2009, 11:30 a.m. EST

As of 11 AM, April 30, CDC has confirmed 91 confirmed cases in 10 states. The outbreak of disease in people caused by a new influenza virus of swine origin continues to grow in the United States and internationally.

This document provides interim guidance for clinicians who might provide care for patients with swine-origin influenza A (H1N1) or suspected swine-origin influenza A (H1N1) virus infection.

Two new questions answered: What is CDC doing in response to the outbreak?

This document provides interim guidance for healthcare facilities (e.g., hospitals, long-term care and outpatient facilities, and other settings where healthcare is provided) and will be updated as needed.