title: Outbreak of swine-origin influenza A (H1N1) virus infection - Mexico, March-April 2009.
abstract: In March and early April 2009, Mexico experienced outbreaks of respiratory illness and increased reports of patients with influenza-like illness (ILI) in several areas of the country. On April 12, the General Directorate of Epidemiology (DGE) reported an outbreak of ILI in a small community in the state of Veracruz to the Pan American Health Organization (PAHO) in accordance with International Health Regulations. On April 17, a case of atypical pneumonia in Oaxaca State prompted enhanced surveillance throughout Mexico. 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. This report describes the initial and ongoing investigation of the S-OIV outbreak in Mexico.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D005260:Female; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D007223:Infant; D017053:Infection Control / Q000379:methods; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology* / Q000517:prevention & control; D008297:Male; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D011159:Population Surveillance / Q000379:methods*