When has the H1N1 flu virus been known?

Since it was discovered and started to erupt into epidemics, the swine flu virus also has the scientific name H1N1 has become an obsession for many countries around the world.

However, this virus is not new in the past few years as many people still mistakenly believe. In fact, H1N1 has been around for more than a century and is known by many different names.

Molecular structure of influenza virus.

Starting from the flu in 1889

In early 1889, the most widely circulated flu virus in humans began with the strain of H1 virus. However, at that time, the world also witnessed the emergence of the H2 influenza virus in Russia. H2 flu viruses have rapidly spread around the world and killed more than 1 million people. The "fame" of the flu virus H2 then even overwhelmed the H1 virus and made people forget the H1 flu virus. In addition, because people who had the flu at that time began to have immunity to H1, when the H1N1 pandemic broke out in 1918, many people were not infected.

Spanish flu in 1918

1918 is known for the outbreak of the Spanish flu "Spanish flu". The flu has killed at least 50 million people worldwide. It is also caused by the H1N1 virus and begins to spread from a bird to a human. In the summer of 1918, the flu epidemic spread throughout the world. One-third of the world's population has been infected with the flu and most of it is caused by contact with wild animals that mediate pathogens. Most people who suffer from the disease have serious lung damage after being infected with the virus. Many cases have died after being infected with the virus. After 1919, the next generation of H1N1 viruses continued to develop and change, they transformed into the influenza virus that developed and spread strongly in humans and pigs. In 1931, the swine flu epidemic first appeared in Iowa.

1933

The first influenza virus on humans appeared at Mill Hill - London - England. When introducing the virus into the bodies of ferrets, the disease that appears in ferrets also has the same expression as the swine flu in Iowa. However, when analyzing human influenza viruses and influenza viruses in Iowa pigs, there are two different types of viruses. Since then, scientists have discovered that influenza viruses have begun to change when attacking different hosts.

1957

The H2N2 virus that causes influenza pandemic in Asia has completely replaced the H1N1 virus that attacked humans in 1918. The flu has killed 1 to 1.5 billion people worldwide. H2N2 virus was first discovered on birds and poultry. H and N are symbols of the detected proteins that almost everyone's body does not have antibodies to this virus. However, after many attacks by influenza viruses, the human body has gradually formed a significant immunity. This makes the number of victims killed by influenza virus in 1957 much more limited.

1968

H3N2 virus has caused a terrible disease in Hong Kong. It killed an estimated 0.75 million to 1 million people around the world. Unlike the structure of H2N2, the structure of H3N2 is more different, some people still have the ability to resist virus attack. In 1968, H3N2 completely replaced H2N2 in humans. No one born in 1968 has an immune system that is resistant to H2.

1972

Researcher Graham Laver and Robert Webster discovered that waterbirds are the hosts of the flu strain. And this virus can spread from birds to humans quickly and is also very easy to transform.

In 1976

The H1N1 virus moved from pigs to humans and was the culprit of death for some soldiers in the US military. However, this virus strain does not spread strongly and does not form epidemics as in many previous cases. However, the obsession with the recurrence of the 1918 pandemic caused more than 48 million people to rush to vaccinate against the swine flu virus. Unfortunately, this vaccine has caused many people with Guillain - Barré syndrome: with 532 people to get sick and 25 to die after using the antiviral vaccine.

1977

H1N1 virus appears in Northeast China and begins to spread on people. It has caused chronic flu for many years after that. No one was able to understand the origin of the influenza virus, although it was relatively similar to the H1N1 virus that appeared in the Soviet Union in 1950. Some scientists also hypothesized to suspect that the virus was Results of an experimental accident.

In 1998

The precursor influenza virus of the later swine flu virus has appeared in the United States. That is the result of a combination of human influenza viruses, poultry and swine flu viruses. In 1999, this virus broke out in the United States. Farms in the United States have used vaccines, but they are not very effective, because the virus changes so quickly.

Year 2004 - 2006

H5N1 influenza virus first appeared in Hong Kong and spread rapidly to countries in Asia and around the world. It killed the first victims infected with H5N1. Although health organizations around the world are constantly giving worrying warnings about the potential of the virus to spread from person to person, in fact, the H5N1 virus has only spread in poultry and poultry. birds and pigs.

2007 - 2008

Fearful of the risk of an outbreak of influenza, European scientists began to consider changing the direction of migration of wild birds - considered host carriers. However, H5N1 began to be found in Indonesia shortly thereafter.

2009

The first cases of swine flu were detected in Mexico in March 2009. In just over a month, the World Health Organization has continuously raised the alert level of the danger of influenza. across the globe.