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Ultimately, SARS and MERS each killed fewer than 1,000 people.ĬOVID-19 is already reported to have killed more than twice that number. Had there been more of them, the disease would have spread widely. If there were mild or asymptomatic cases, they were extremely few. These diseases were highly fatal to humans. By contrast, the two prior novel coronavirus outbreaks-SARS (severe acute respiratory syndrome) and MERS (Middle East respiratory syndrome, named for where the first outbreak occurred)-were picked up from animals, as was H5N1. These are believed to have evolved in humans to maximize their own spread-which means sickening, but not killing, people. * Four coronaviruses commonly infect humans, causing colds. The virus has raised alarm not despite that low fatality rate, but because of it.Ĭoronaviruses are similar to influenza viruses in that they both contain single strands of RNA. The disease (known as COVID-19) seems to have a fatality rate of less than 2 percent-exponentially lower than most outbreaks that make global news. The new coronavirus (known technically as SARS-CoV-2) that has been spreading around the world can cause a respiratory illness that can be severe. They do not walk around feeling just a little under the weather, seeding the virus. Severe illness caused by viruses such as H5N1 also means that infected people can be identified and isolated, or that they died quickly. Read: The official coronavirus numbers are wrong, and everyone knows it The much “milder” flu viruses, by contrast, kill fewer than 0.1 percent of people they infect, on average, but are responsible for hundreds of thousands of deaths every year.
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Yet since 2003, the virus has killed only 455 people. H5N1 has a fatality rate of about 60 percent-if you get it, you’re likely to die. In part, containment was possible because the disease was so severe: Those who got it became manifestly, extremely ill. This was seen as a successful global response, and the virus was not seen again for years. By the end of the year there were 18 known cases in humans. Further cases were closely monitored and isolated. The Chinese government swiftly killed 1.5 million chickens (over the protests of chicken farmers). Scientists sent distress signals around the world. It was H5N1, or “avian flu,” discovered two decades prior, but known only to infect birds.īy then, it was August. But this type had never before been seen in humans. The results eventually confirmed that this was a variant of influenza, the virus that has killed more people than any in history. Centers for Disease Control and Prevention in Atlanta, the boy’s sputum sat for a month, waiting for its turn in a slow process of antibody-matching analysis. Read: What you can do right now about the coronavirusĪt the U.S. The chief virologist decided to ship some of the sample to colleagues in other countries. But the standard testing protocol couldn’t fully identify the virus that had caused the disease. Puzzled by his rapid deterioration, doctors sent a sample of the boy’s sputum to China’s Department of Health. There his cough worsened, and he began gasping for air. When his symptoms-sore throat, fever, and cough-persisted for six days, he was taken to the Queen Elizabeth Hospital in Hong Kong.
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In May 1997, a 3-year-old boy developed what at first seemed like the common cold.