The outbreak of human infection due to the novel swine-origin influenza A (H1N1) virus
began in Mexico in March 2009. As of July 6, 2009, more than 94 000 laboratory-confirmed …

A swine-origin influenza A (H1N1) virus is currently responsible for an outbreak of infections
in the human population, with laboratory-confirmed cases reported in several countries and …

Background On April 15 and April 17, 2009, novel swine-origin influenza A (H1N1) virus (S-
OIV) was identified in specimens obtained from two epidemiologically unlinked patients in …

Background. A novel swine-origin influenza A (H1N1) virus was identified in March 2009
and subsequently caused worldwide outbreaks. The San Diego region was an early focal …

In mid-March 2009, the Ministry of Health of Mexico began to identify an unusual increase in
the number of cases of influenza-like illness at a time when seasonal outbreaks are typically …

Abstract A novel influenza A H1N1 virus of swine origin is responsible for the influenza
epidemic affecting Mexico, the United States of America (USA), and 39 other countries …

In the spring of 2009, a new human influenza A H1N1 virus emerged in Mexico and the
United States. The strain was referred to as “swine flu” as it has strong similarities with …

Since April 21, 2009, CDC has reported cases of respiratory infection with a swine-origin
influenza A (H1N1) virus (S-OIV) transmitted through human-to-human contact. This report …

In the 4 months since it was first recognized, the pandemic strain of a novel influenza A
(H1N1) virus has spread to all continents and, after documentation of human-to-human …

Since mid-April 2009, CDC, state and local health authorities in the United States, the World
Health Organization (WHO), and health ministries in several countries have been …