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The latest: Health officials in the United States warned Tuesday that the spread of the novel coronavirus in the country appears inevitable. Coronavirus is moving closer to becoming a pandemic.

Problems with a U.S. government-created coronavirus test have limited the country’s capacity to rapidly increase testing, just as the outbreak has entered a worrisome new phase. The Dow Jones industrial average sank 879 points Tuesday as investors absorbed increasingly worrisome forecasts.

What is coronavirus, and how does it spread? Coronaviruses are a large family of viruses whose effects range from causing the common cold to triggering much more serious diseases, such as severe acute respiratory syndrome, or SARS. Here’s how epidemics such as that involving covid-19 end (and how to end them faster).

Mapping the spread of the new coronavirus: More than 25 countries have reported at least one case of coronavirus. Infections have been confirmed in France, India, Hong Kong, Japan, Nepal, Spain, Cambodia, Belgium, Singapore, Sweden, Egypt, the United Arab Emirates, Italy, Vietnam, Taiwan, Canada and Sri Lanka.

How does the coronavirus make people sick, and why does it kill some of them? When people die of the coronavirus, it’s not just the virus that kills them — it’s their own immune system. These are the biggest questions surrounding the virus.