Human cases of novel H1N1 flu virus infection have been identified in the United States and several countries around the world. For daily updates on where cases have been identified, see the CDC H1N1 Flu website.

CDC is working very closely with officials in states where human cases of novel H1N1 flu have been identified, as well as with the World Health Organization (WHO) and health officials in Mexico and Canada. CDC also has prepared some information below about issues related to the travel industry. This is a rapidly evolving situation, and CDC will provide new information as it becomes available.

General Info on Novel H1N1 Flu

• Novel H1N1 Flu: General Information 
• Información en español: Datos importantes sobre la influenza H1N1 (porcina)

Travel Notices

Domestic Travel

• Outbreak Notice: Novel H1N1 Flu in the United States Updated April 30, 2009

International Travel

• Travel Warning: Novel H1N1 Flu in Mexico - Avoid Nonessential Travel to Mexico Updated April 30, 2009

General Information for Travelers

• Risk of Novel H1N1 Flu Associated with Travel to Affected Areas Updated May 04, 2009
• Riesgo de contraer influenza H1N1 (porcina) asociado a viajes a áreas afectadas Updated April 30, 2009

Health Information for Travelers Exposed During Travel

• Information for airline passengers exposed to novel H1N1 flu (189.00 KB, 4 pages) - 4/26/2009
• Información para los pasajeros de líneas aéreas expuestas a la gripe H1N1 (porcina) (120.00 KB, 4 pages)  - April 26, 2009

Information for the Travel Industry

Airlines

• Guidance to Assist Airline Flight Deck and Cabin Crew in Identifying Passengers Who May Have Novel H1N1 Flu - April 30, 2009
• Guidance for Airlines Regarding Flight Crews Arriving from Domestic and International Areas Affected by Novel H1N1 Flu - April 30, 2009

Cruise Ships

• Interim Novel Influenza A (H1N1) Guidance for Cruise Ships - May 4, 2009