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.

How Did Influenza Start

The virus is contagious spreading easily from one person to another and from one country to another. That gave others the.

Influenza Precautions Then And Now Circulating Now From Nlm

Unlike the world affected by the 1918 influenza pandemic we now have antivirals vaccines diagnostic tests and modern surveillance techniques.

How did influenza start. This particular H1N1 strain has not circulated previously in humans. Many of these advances were spearheaded by WHO in close collaboration with other agencies and national and regional institutions. Influenza-like illness epidemic develops in Europe preferentially killing elderly and debilitating persons.

The great influenza pandemic of 1918-19 often called the Spanish flu caused about 50 million deaths worldwide. Thats the global pattern. An outbreak can occur if a new strain of influenza virus emerges against which the population has no immunity.

It would be applied again to the epidemic in 13861387. Although there is not universal consensus regarding where the virus originated it spread worldwide during 1918-1919. The name of Spanish Flu came from the early affliction and large mortalities in Spain BMJ10191918 where it allegedly killed 8 million in May BMJ 7131918.

The 1918 influenza pandemic was the most severe pandemic in recent history. 70 rows The term influenza is first used to describe a disease prevailing in 1357. As of today nearly 30000 confirmed cases have been reported in 74 countries.

Few noticed the epidemic in the midst of the war. The 1918 flu pandemic struck in three waves across the globe starting in the spring of that year and is tied to a strain of H1N1 influenza ancestral to ones still virulent today. Roy Grist a physician at the hospital wrote a colleague These men start with what appears to be an ordinary attack of LaGrippe or Influenza and when brought to.

The virus is entirely new. Of the suggestion that the 1918-19 influenza virus may have originated in China as well as the suggestion that Chinese workers who traveled to France during World War I may have been responsible for spreading the disease far more widely. In 1933 three scientists isolated the Influenza A virus in ferrets one of the three types of flu and in 1936 it was discovered that the virus could be grown inside embryonated chicken eggs a.

The Asian flu swept the world in 1957 the Hong Kong flu in 1968 and in 1976 the swine flu looked enough like the 1918 virus that President Ford ordered the. Influenza is caused by a virus that is transmitted from person to person through airborne respiratory secretions. Franciss network began reporting influenza cases at the test sites 17 at U-M then 100 at St.

Influenza is a virus thats spread from person to person. Far more than the deaths from combat casualties in the World War. Soon it was clear that a major flu epidemic was underway the most widespread since 1918 though this years strain didnt attack the lungs so there were few fatalities.

The influenza pandemic of 191819 resulted from such an occurrence and affected populations throughout the world. However a first wave of influenza appeared early in the spring of 1918 in Kansas and in military camps throughout the US. 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.

The flu investigators began to tabulate the results. In 1936 Burnet discovers that influenza virus can be grown in embryonated hens eggs. In late April WHO announced the emergence of a novel influenza A virus.

The world looks very different from it did 100 years ago however. Thomas Francis Jr MD and Jonas Salk MD serve as lead researchers at the University of Michigan to develop the first inactivated flu vaccine with support from the US. In March of that year the United States experienced the first outbreaks of what would become known as The Spanish Flu an erroneous term adopted because the press in neutral Spain escaped wartime censorship and freely wrote about the illness.

Influenza has likely been around for millennia though its cause was only identified relatively recently. The 1957 pandemic flu virus or influenza A subtype H2N2 is thought to have given rise to H3N2 through a process called antigenic shift in which the hemagglutinin H antigen a substance that stimulates an immune response on the outer surface of the virus underwent genetic mutation to. It was caused by an H1N1 virus with genes of avian origin.

I conclude that influenza was widespread in China in 1918-. One of the earliest reports of an influenza-like illness comes from Hippocrates who.