Brian Geiss/The Conversation
More from Brian Geiss/The Conversation
![President Donald Trump signing an executive order in the White House in 2017](https://www.popsci.com/wp-content/uploads/2020/10/06/QWMMHSN2ENFH3BPT7IIOAX4II4.jpg?w=675)
COVID-19
Why COVID-19 attacks aging immune systems so fiercely Why COVID-19 attacks aging immune systems so fiercely
By Brian Geiss/The Conversation
October 6, 2020