Fig. 1

Flowchart depicting the samples collected and analyzed for antibody and cellular immune responses in the COVID-19 re-infection and its predictors (CORES) cohort participants. “+” denotes “positive”, D0- Day 0, D30- Day 30 and D90- Day 90, ACE2- Angiotensin-converting enzyme2, RT-PCR- reverse transcriptase polymerase chain reaction, ELISPOT- Enzyme-Linked ImmunoSpot.