Question 1: Do you also have a significant protection against reinfections when your first SARS-CoV-2 infection was asymptomatic? Answer: Yes (Clinical Infectious Diseases)
https://academic.oup.com/cid/advance-…
Question 2: Are the data on natural immunity also valid for the Omicron variant? Answer: Yes, (Letter to NEJM) Protection against the Omicron Variant from Previous SARS-CoV-2 Infection