The coronavirus outbreak has now spread to 23 countries, and experts are increasingly pessimistic about the chances of containing it. Chinese authorities say there have been more than 17,000 cases, but scientists believe the real figure could be closer to 100,000, the New York Times reports. They warn that it is very likely to become a pandemic—a new disease that spreads worldwide—but what's still unclear is how deadly the coronavirus will turn out to be. Officials say the mortality rate so far has been around 2%, but that figure is likely to drop when more mild cases are detected. "It’s very, very transmissible, and it almost certainly is going to be a pandemic,” says Dr. Anthony S. Fauci, director of the National Institute of Allergy and Infectious Diseases. "But will it be catastrophic? I don't know."
- New evidence of origin. Chinese researchers presented more evidence in two studies released Monday that the virus, like the viruses that cause Severe Acute Respiratory Syndrome, originated in bats, though it may have infected humans via another species, the AP reports. "In essence, it’s a version of SARS that spreads more easily but causes less damage," says Ian Jones, a professor of virology at the University of Reading. "The virus also uses the same receptor, the door used to get into human cells, which explains transmission and why it causes pneumonia."