“Yes, you can get Omicron twice,” Stanley Weiss, an epidemiologist at Rutgers School of Public Health, told Yahoo, citing discussions with colleagues in South Africa. “If you had a mild infection, didn’t get a very good immune response, and you get exposed again with a big dose of the virus, it’s definitely possible,” he said.
https://fortune.com/2022/02/10/can-you-catch-omicron-twice-reinfections/