Where did the H1N1 virus originated?
The H1N1/pdm2009 virus was first isolated from humans in North America in April 2009 (Smith et al., 2009). After its emergence, the H1N1/pdm2009 virus has replaced the previous human seasonal H1N1 and has circulated as a seasonal virus, posing a substantial risk to human populations.
What is H1N1 and where did it come from?
In the spring of 2009, scientists recognized a particular strain of flu virus known as H1N1. This virus is a combination of viruses from pigs, birds and humans that causes disease in humans. During the 2009-10 flu season, H1N1 caused the respiratory infection in humans that was commonly referred to as swine flu.
How did H1N1 spread from pigs to humans?
The virus likely spreads from pig to pig through contact with infected mucous secretions. (When pigs are really sick, their mucous carries high levels of virus). Strains of swine flu virus also can be directly transmissible to humans. Most human infections occurred following direct contact with infected pigs.
How did swine flu jump to humans?
Transmission of swine influenza viruses to humans is uncommon. However, the swine influenza virus can be transmitted to humans via contact with infected pigs or environments contaminated with swine influenza viruses.
How many people died from the bird flu?
Confirmed human cases and mortality rate of avian influenza (H5N1)
|Source: World Health Organization Human Animal Interface|
How did bird flu start?
The virus was first detected in 1996 in geese in China. Asian H5N1 was first detected in humans in 1997 during a poultry outbreak in Hong Kong and has since been detected in poultry and wild birds in more than 50 countries in Africa, Asia, Europe, and the Middle East.
Is Spanish flu the same as H1N1?
Spanish flu, also known as the Great Influenza epidemic or the 1918 influenza pandemic, was an exceptionally deadly global influenza pandemic caused by the H1N1 influenza A virus.