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An influenza pandemic is a global outbreak of a new influenza A virus that is very different from current and recently circulating human seasonal influenza A viruses. Influenza A viruses are constantly changing, making it possible on very rare occasions for non-human influenza viruses to change in such a way that they can infect people easily and spread efficiently from person to person.

Read more about pandemics in recent history. Skip directly to site content Skip directly to page options Skip directly to A-Z link. Influenza Flu. Section Navigation. The Debate. Breaking News. The new Facebook update has made it harder for users to find the most recent option. Here's a tutorial for it. Written By. Is Facebook Most Recent gone? Tap on the three lines icon on the top right of the Facebook app that discloses the entire menu. From there, scroll down to 'See More' to find more features listed below.

Upon clicking, the user will then be redirected to the most recent timeline, which will be paired alongside favourites. In populations outside of Europe, where people had little contact with the virus before visitors brought it to their regions, mortality rates were much higher.

In the 20th century alone, smallpox killed million people, the BBC reported. Hantavirus pulmonary syndrome HPS first gained wide attention in the U. A few months later, health authorities isolated hantavirus from a deer mouse living in the home of one of the infected people. More than people in the U. The virus is not transmitted from one person to another, rather, people contract the disease from exposure to the droppings of infected mice. Previously, a different hantavirus caused an outbreak in the early s, during the Korean War, according to a paper in the journal Clinical Microbiology Reviews.

While the virus was new to Western medicine when it was discovered in the U. During a typical flu season, up to , people worldwide will die from the illness, according to WHO. But occasionally, when a new flu strain emerges, a pandemic results in a faster spread of disease and, often, higher mortality rates. Dengue virus first appeared in the s in the Philippines and Thailand and has since spread throughout the tropical and subtropical regions of the globe, according to Clinical Microbiology Reviews.

A vaccine for Dengue was approved in by the U. Food and Drug Administration for use in children years old living in areas where dengue is common and with a confirmed history of virus infection, according to the CDC. In some countries, an approved vaccine is available for those years old, but again, recipients must have contracted a confirmed case of dengue in the past.

Those who have not caught the virus before could be put at risk of developing severe dengue if given the vaccine. Two vaccines are now available to protect children from rotavirus, the leading cause of severe diarrheal illness among babies and young children. The virus can spread rapidly, through what researchers call the fecal-oral route meaning that small particles of feces end up being consumed.

Although children in the developed world rarely die from rotavirus infection , the disease is a killer in the developing world, where rehydration treatments are not widely available. The WHO estimates that worldwide, there are more than 25 million outpatient visits and two million hospitalizations each year due to rotavirus infections. Countries that have introduced the vaccine have reported sharp declines in rotavirus hospitalizations and deaths. The virus likely emerged in bats initially, then hopped into nocturnal mammals called civets before finally infecting humans, according to the Journal of Virology.

After triggering an outbreak in China, SARS spread to 26 countries around the world, infecting more than people and killing more than over the course of several months, according to History. The disease causes fever, chills and body aches, and often progresses to pneumonia, a severe condition in which the lungs become inflamed and fill with pus.

SARS has an estimated mortality rate of 9. The virus may have originated in bats and passed through an intermediate animal before infecting people, according to Nature. The initial outbreak prompted an extensive quarantine of Wuhan and nearby cities, restrictions on travel to and from affected countries and a worldwide effort to develop diagnostics, treatments and vaccines.

Since its appearance, the virus has caused over five million deaths worldwide, according to Reuters. Common symptoms include fever, cough, loss of taste or smell and shortness of breath and more serious symptoms include breathing difficulties, chest pain and loss of mobility. On Aug.