https://arstechnica.com/science/2020/03/spacex-and-tesla-could-build-ventilators-musk-tells-twitter-fan/

As with previous epidemics that attack the lungs, one of the biggest worries about COVID-19 is that we simply won't have enough ventilators to treat critically ill patients. It's a valid concern, based on reports from Italy. The US government has confirmed that the nation has a stockpile of more than 10,000 ventilators, but President Trump also recently told Twitter that it should be the states' responsibility to buy these vital life-saving devices.

Over the past few days, there have been growing calls to mobilize advanced manufacturing industries to meet this need, and on Wednesday night, Elon Musk replied to a fan on twitter that his companies "will make ventilators if there is a shortage."