IELTS Reading Articles and Doubts June 2020 - tarunchhabra/parakalo GitHub Wiki

1. Under rarer circumstances, patients may experience symptoms that are similar to, or perhaps even more severe, than the first time their body encountered the pathogen.

Even then, while a positive antibody test (also called a serology test) can say a lot about the past, it may not indicate much about a person’s future.

Q: how to use comma?

https://www.smithsonianmag.com/science-nature/coronavirus-immunity-complicated-180974970/