BRACE Yourself: Unexpected Ineffectiveness of BCG Vaccine Against COVID-19 in Healthcare Workers

Long COVID: Cedars-Sinai Researchers Find COVID-19 Vaccine Produces Antibodies Far Longer Than Expected

A Dangerous Connection Unveiled: Long COVID & Physical Inactivity

Researchers disagree over how bad it is to be reinfected, and whether COVID-19 can cause lasting changes to the immune system. (Nature)