Via: Business Insider:
A study published Friday in the journal Cell suggests that everyone who gets COVID-19 – even people with mild or asymptomatic cases – develops T cells that can hunt down the coronavirus if they get exposed again later.
“Memory T cells will likely prove critical for long-term immune protection against COVID-19,” the study authors wrote, adding that they “may prevent recurrent episodes of severe COVID-19.”
That’s because memory T cells can stick around for years, while antibody levels drop following an infection.
Study: Robust T cell immunity in convalescent individuals with asymptomatic or mild COVID-19