List of dangerous viruses

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. In December , this vaccine became the first to be approved after a large clinical trial, according to Nature. According to WHO , the disease infected camels before passing into humans and can trigger a fever, coughing and shortness of breath in infected people. There is no vaccine available to prevent this disease, according to the NHS.

The best way to reduce the chances of infection is to wash hands regularly, avoid contact with camels and not consume products containing raw animal milk. Live Science. See all comments Strategy As Amazon to Tesla fight for chips, global semiconductor industry change complexion amid shortage.

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