As people strive to keep themselves free of the coronavirus, it may be surprising to find out that humans actually breathe in tens of thousands of micro-organisms a day.
A robust immune system is vital to long-term good health. Should one catch a bug, one would display milder symptoms and recover faster.
Already a subscriber? Log in
Read the full story and more at $9.90/month
Get exclusive reports and insights with more than 500 subscriber-only articles every month
ST One Digital
$9.90/month
No contract
ST app access on 1 mobile device
Unlock these benefits
All subscriber-only content on ST app and straitstimes.com
Easy access any time via ST app on 1 mobile device
E-paper with 2-week archive so you won't miss out on content that matters to you
