300 facts about influenza (Flu) H1N1, H3N2, and bird flu H5N1



Introduction(300 facts about influenza)

Influenza or flu commonly called “the flu causes due to the viruses and it infects the respiratory tract. The common symptoms of it are fever, chills, cough, sore throat, headache, muscle aches, and tiredness. The flu symptoms in the majority of individuals remain for about one to two weeks and then recover with no problems. Compared with other viral respiratory infections, like common cold, influenza (flu) infection is more severe infection with a mortality rate of about 0.1% among those who are infected with the virus.(300 facts about influenza)

Sometimes some severe outbreaks of flu occur when an infected human population is exposed to a flu strain against the population who has little or no immunity since the virus has become altered in a significant way. These outbreaks are called epidemics. Abnormally severe globally outbreaks (pandemics) have happened several times in the last hundred years since influenza virus was identified in 1933. the worst influenza pandemic (Spanish flu or Spanish influenza) happened in 1918 when the virus caused between 40-100 million deaths globally, with a mortality rate likely to range from 2%-20%.(300 facts about influenza)

In April 2009, a brand new respiratory disorder strain that the global population has very little or no immunity was isolated from humans in the United Mexican States. It quickly unfolds throughout the globe thus quick that the World Health Organization declared this new respiratory illness strain (first termed novel H1N1 respiratory disorder A grippe, typically later shortened to H1N1 or even-toed ungulate flu) because of the reason for a deadly disease on November 2009. This was the primary declared respiratory illness pandemic in forty-one years. fortuitously, there was a worldwide response that enclosed immunizing agent production, sensible hygiene practices (especially hand washing) were stressed, and also the virus (H1N1) caused way less morbidity and mortality than was expected and foreseen. The United Nations agency declared the pandemic’s endways August. 10, 2010, as a result of it does not work into the WHO’s criteria for a deadly disease.(300 facts about influenza)

A new respiratory disorder strain, H3N2, was known in 2011; however this strain has caused solely concerning 330 infections with one death within the U.S. Another strain, H5N1, a bird flu virus, has been known since 2003 and has caused concerning 650 human infections; this virus has not been detected within the U.S. and presently isn’t known  to simply unfold among individuals in distinction to different respiratory illness strains. The individuals infected with H5N1 have a high death rate (about hr of infected individuals die); presently, H5N1 isn’t without delay transferred from person to person like different respiratory illness viruses.

The most recent information for the mortality (death rates) from respiratory disorder rate (death rate) for us in 2016 indicates that mortality from respiratory disorder varies from year to year. Death rates calculable by the CDC vary from concerning twelve,000 throughout 2011-2012 to fifty-six,000 throughout 2012-2013.

Hemophilic influenza may be a microorganism that was incorrectly thought-about to cause the respiratory illness till the virus was incontestable to be the proper cause in 1933. This microorganism will cause respiratory organ infections in infants and youngsters, and it sometimes causes ear, eye, sinus, joint, and a number of different infections, however, it doesn’t cause the respiratory illness.(300 facts about influenza)

Another confusing term is an inflammatory disease. This term refers to an epithelial duct infection, not an infection like respiratory disorder (flu); inflammatory disease (gastroenteritis) isn’t caused by respiratory disorder viruses.(300 facts about influenza)

Although ab initio symptoms of respiratory disorder could mimic those of a chilly, respiratory disorder is a lot of debilitating with symptoms of fatigue, fever, and metastasis congestion. Colds may be caused by over one hundred totally different virus varieties, however, solely respiratory disorder viruses (and subtypes) A, B, and C cause the respiratory illness. Additionally, colds don’t cause serious diseases like a respiratory disease; however severe infections with respiratory disorder viruses will cause respiratory disease or maybe death.

Flu Shot aspect Effects(300 facts about influenza)

Many people worry concerning aspect effects from the respiratory illness shot, however, serious complications are rare. Some individuals believe that they will truly get the respiratory illness from receiving the shot, however, this is often not the case. For the bulk of individuals, the risks of developing the respiratory illness are way larger than any risks related to the immunizing agent.

Most aspect effects and reactions to the respiratory illness shot ar delicate. Most typically, individual’s expertise soreness, redness, or delicate swelling at the location wherever the shot was given. These effects usually don’t last for quite two days. In rare cases, individuals could develop different delicate reactions to the respiratory illness immunizing agent like fever and aches, which can erroneously lead them to believe that they developed the respiratory illness as results of the immunizing agent. These symptoms conjointly escape when concerning one to two days. Hypersensitive reactions to the respiratory illness shot are terribly rare.

Facts about Influenza(300 facts about influenza)

       *      Infection period remains around one to four days.

  • Flu is infectious, and its symptoms can last for 7 to 14 days.
  • Flu is analyzed by studying patient’s history, physical and laboratory tests.
  • The Flu spreads directly or indirectly from a person to person by sneezing or coughing and the contamination on surfaces that are touched by an uninfected person.
  • Viruses of Influenza are divided into three types which are designated as A, B, and C. A-type influenza usually causing the greatest problems in humans.
  • People who acquire conventional or seasonal flu get well totally in one to two weeks. However, some people grow serious and potentially life-threatening flue like pneumonia.
  • Mostly illness and death caused by conventional or seasonal influenza can be stopped by influenza vaccination.
  • Influenza A undergoes common antigenic changes that necessitate new vaccines to be developed and people to obtain a new vaccination every year.
  • A new virus namely H1N1 swine flu was from Mexico In April 2009 and it spread all over the world.  WHO declares flu epidemic in 2010. Again in 2012another new type of flu strain developed that is H3N2. However, it did not develop any epidemic situations.
  • Flu vaccine Effectiveness varies year to year because flu strains also vary year on year.
  • Symptoms flu may be treated by some home remedies.
  •  Treatments for flu is changing and improving, the timely vaccination is considered to be the best protection against the flu. U.S. Centers for Disease Control and Prevention (CDC) considers antiviral drugs are an important assistant to the flu vaccine to control the disease.
  • People should be aware that flu. Severe flu can be the symptoms of epidemics. It could sometimes cause death in many people who are susceptible to the pandemic flu than the conventional flu.  
  • Bird flu (H5N1) infects humans who have close acquaintances with birds.
  • People should take advice with their doctors to determine if they considered being at higher risk of getting severe flu symptoms than the normal.

The following table is provided by the CDC to know distinguish between influenza and cold(300 facts about influenza)

Sign and symptom influenza cold
Symptom start Abrupt Gradual
Fever Usual; lasts 3-4 days Rare
Aches Usual; often severe Slight
Chills Fairly common Uncommon
Fatigue, weakness Usual Sometimes
Sneezing Sometimes Common
Stuffy nose Sometimes Common
A sore throat Sometimes Common
Chest discomfort, cough Common; can be severe Mild to moderate; a hacking cough
Headache Common Rare

Source- http://journals.plos.org/plospathogens/article?d=10.1371/journal.ppat.1006450


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