CDC officials warned on Tuesday that the coronavirus could spread in the US. Health experts say the US is already lagging behind other countries in terms of testing for the virus. The nation is also 270 million masks short of the total it needs to protect healthcare workers, Health and Human Services Secretary Alex Azar said on Wednesday. For the latest case total, death toll, and travel information, see Business Insider's live updates here. Visit Business Insider's homepage for more stories. US health officials issued a dire warning to American citizens on Tuesday: Prepare for a coronavirus outbreak. "It's not so much of a question of if this will happen anymore, but rather more of a question of exactly when this will happen," Nancy Messonnier, director of the National Center for Immunization and Respiratory Diseases, said in a press briefing.