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The influenza A virus subtype H1N1 (initially known as swine influenza virus or as new flu, and also locally known as gripe A, gripe porcina, and influenza porcina) arrived in Argentina in late April 2009, through air traffic contact with endemic areas, especially Mexico and the United States.
Influenza, commonly known as the flu, is an infectious disease caused by influenza viruses.Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue.
[71] [72] As well as persisting in pigs, the descendants of the 1918 virus have also circulated in humans through the 20th century, contributing to the normal seasonal epidemics of influenza. [72] However, direct transmission from pigs to humans is rare, with only 12 recorded cases in the U.S. since 2005. [73]
Influenza A virus (IAV) is the only species of the genus Alphainfluenzavirus of the virus family Orthomyxoviridae. [1] It is a pathogen with strains that infect birds and some mammals, as well as causing seasonal flu in humans. [2]
The 2009 swine flu pandemic, caused by the H1N1/swine flu/influenza virus and declared by the World Health Organization (WHO) from June 2009 to August 2010, was the third recent flu pandemic involving the H1N1 virus (the first being the 1918–1920 Spanish flu pandemic and the second being the 1977 Russian flu).
The Hong Kong flu, also known as the 1968 flu pandemic, was an influenza pandemic that occurred between 1968 and 1970 and which killed between one and four million people globally.
Modern transport infrastructure assisted the spread of the 1889 pandemic. The 19 largest European countries, including the Russian Empire, had about 200,000 km of railroads, and transatlantic travel by sea took less than six days (not significantly different from current travel time by air, given the timescale of the global spread of a pandemic). [11]