The Living Rainforest: Where Did Influenza Come From

Monday, April 5, 2021

Where Did Influenza Come From

Its unknown exactly where the particular strain of influenza that caused the pandemic came from. Around 2008 or 2009 an influenza A virus that had been circulating undetected in swine entered human population.

Influenza Wikipedia

It is a critical tool for tracking the movement of.

Where did influenza come from. The 2009 H1N1 influenza virus referred to as swine flu early on was first detected in people in the United States in April 2009. Influenza comes to English from Italian where it derived from the Medieval Latin word influentia. Though they dont mutate as quickly when they.

There were about 60 million reported cases of infection with more than 274000 hospitalizations and upward of 12000 deaths in the United States. There are four influenza strains that circulate in the human population. One of the earliest reports of an influenza-like illness comes from Hippocrates who described a highly contagious disease from northern Greece ca.

Thats the global pattern. Six of the genes are closest in sequence to those of H1N2 triple-reassortant influenza viruses isolated from pigs in North America around 1999-2000. Michael Worobey at the University of Arizona in Tucson and colleagues developed an unprecedentedly accurate molecular clock approach and used it to reconstruct the origins of the 1918 pandemic H1N1 influenza A virus IAV the classical swine H1N1 influenza virus and the post-pandemic seasonal H1N1 lineage that circulated from 1918 until 1957.

It originates actually among birds and other animals such as pigs and new viral strains of influenza come to this country and to Europe from Southeast Asia. So while a lot of H1N1 strains still come from Asia the map shows they spread from other places too. The 2009 swine H1N1 flu pandemic -- responsible for more than 17000 deaths worldwide -- originated in pigs from a very small region in central Mexico a research team is reportingThe scientists.

They evolve just enough to evade human immune systems but not enough to develop into completely new versions of the virus. FluNet a web-based flu surveillance tool is launched by WHO. These viruses spread seasonally each year because of a phenomenon known as antigenic drift.

The word influenza however wasnt. Russell said that he and his colleagues found that each year since 2002 new strains of influenza A H3N2 the most infectious variety of seasonal flu. Both etyma translate to influence in their respective languages an allusion to how the disease was traditionally attributed to the influence of the stars.

Influenza is a virus thats spread from person to person. The swine-origin influenza A H1N1 virus that appeared in 2009 and was first found in human beings in Mexico is a reassortant with at least three parents. Genetic analysis indicates the virus has been circulating in the human population since last September and its entirely possible given the close connection.

This virus was originally referred to as swine flu because laboratory testing showed that its gene segments were similar to influenza viruses that were most recently identified in and known to circulate among pigs. As many influenza A strains were known to arise in the Orient it was first thought that the virulent 1918 form had also began in the east. However the 1918 flu was first observed in Europe America and areas of.

All influenza A pandemics since that time and indeed almost all cases of influenza A worldwide excepting human infections from avian viruses such as H5N1 and H7N7 have been caused by descendants of the 1918 virus including drifted H1N1 viruses and reassorted H2N2 and H3N2 viruses. The influenza is thought to have spread from Camp Funston in the Unites States Immediately following the 1918 influenza pandemic many researchers speculated on the origin of the disease. Unlike most swine influenza infections of humans this virus established sustained human-to-human transmission leading to a global pandemic.

The H1N1 swine flu pandemiccaused by the same strain of virus responsible for the 1918 pandemicoriginated in Mexico and spread rapidly killing up to a half-million people worldwide. An avian influenza H5N1 virus is first isolated from a farmed goose in China. Where did the 2009 H1N1 flu virus come from.

Historians have suggested that the Spanish influenza mutated and became most deadly in spring 1918 spreading from Europe to ports as far apart. The first human infection with an avian influenza A H5N1 virus is identified in Hong Kong. AH3N2 AH1N1 and two B variants.

Influenza