Why does flu come every year?

Where does the flu come from every winter?

The virus lives longer indoors in winter, because the air is less humid than outside. While it’s alive and in the air, it’s easy for people to inhale it, or for it to land on the eyes, nose, or mouth. We spend more time indoors and have closer contact with each other, which makes it easier for the virus to spread.

Where does the common flu originate from?

Note that this study says that flu strains originate in east and southeast Asia and emerge to cause disease in other parts of the world, in a highly predictable pattern.

Why do flus start in Asia?

The researchers speculate that the broad range of climates in eastern Asia allows epidemics to arise in crowded areas at different times of the year. The flu typically strikes in temperate climes (like those in China) in winter months and in tropical areas, such as those in Vietnam, during their rainy seasons.

Does the flu come every year?

Now unlike measles, which comes in only one form, the influenza virus comes in several forms and changes year to year. And that’s why each year we’re pretty much susceptible to the influenza virus that’s going around. And that’s why we have to get vaccinated against influenza each year in the fall.

Why does the flu come from Southeast Asia?

The source of the annual flu epidemic has long been a mystery. Now the biggest analysis of flu strains ever has shown it comes from eastern and southeast Asia, a product of the connectedness of people and the patchiness of the region’s rainy seasons.

What causes the flu every year?

While more than 100 different viruses can cause a cold, only influenza virus types A, B, and C cause the flu. Type A and B viruses cause the large seasonal outbreaks. Type C usually causes milder respiratory symptoms.

What animal did the flu come from?

The virus that caused the 1918 influenza pandemic probably sprang from North American domestic and wild birds, not from the mixing of human and swine viruses.

How often does the flu happen?

This is about 1 week for adults, but it can be longer for young kids. The flu usually happens in annual epidemics. An epidemic is when an illness spreads quickly and infects lots of people in an area at the same time. Some years the epidemic is more severe and widespread than others.

What animal did the Spanish flu originated from?

The Spanish flu was the name given to a form of influenza (flu) caused by an H1N1 virus that started in some type of bird (avian origin). The Spanish flu was a pandemic — a new influenza A virus that spread easily and infected people throughout the world.

Where do most flu viruses come from?

Answer: Influenza is a virus that’s spread from person to person. 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. That’s the global pattern.

Where was the source of the Spanish flu?

Some medical historians and epidemiologists have theorized that the 1918 pandemic began in Asia, citing a lethal outbreak of pulmonary disease in China as the forerunner of the pandemic. Others have speculated the virus was spread by Chinese or Vietnamese laborers either crossing the United States or working in France.

Was the Spanish flu a bird?

The Spanish flu was a type A form of influenza virus that started in a bird host (bird flu), as discovered during later research. At some point, it was transmitted to mammals.

Did the flu come from cows?

It is not known where the cattle virus originated, nor whether it can spread from cow to cow. Each year, new predominant flu strains emerge through a shuffling of the proteins in the viral coat.Jan 9, 2002

How did the flu virus start?

It was caused by an H1N1 virus with genes of avian origin. Although there is not universal consensus regarding where the virus originated, it spread worldwide during 1918-1919. In the United States, it was first identified in military personnel in spring 1918.

How many get the flu per year?

The flu has resulted in 9.3 million to 49 million illnesses each year in the United States since 2010. Each year, on average, five to 20 percent of the United States population gets the flu. It is estimated that the flu results in 31.4 million outpatient visits and more than 200,000 hospitalizations each year.

Did swine flu come from birds?

The virus had gene segments from bird, human, and pig flu viruses—what scientists call a “triple reassortant.” The pig component had come from both North American swine influenzas and one from Eurasia.

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