![Stylized SEM of the SARS coronavirus.](https://cdn.mos.cms.futurecdn.net/yRFT64QP8JBQAgGQB8KLRe-320-80.jpg)
COVID-19 causes some patients' immune systems to attack their own bodies
Across the world, immunologists who retooled their labs to join the fight against SARS-CoV-2 are furiously trying to explain why some people get so sick while others recover unscathed.