Omicron infections appear no less severe than Delta; COVID-19 lowers sperm count, motility | Reuters

…the odds of reinfection with Omicron are 5.4 times greater than for reinfection with Delta. A study of healthcare workers in the pre-Omicron era estimated that a prior SARS-CoV-2 infection afforded 85% protection against a second infection over 6 months, the researchers said, while "the protection against reinfection by Omicron afforded by past infection may be as low as 19%."

https://www.reuters.com/business/healthcare-pharmaceuticals/omicron-infections-appear-no-less-severe-than-delta-covid-19-lowers-sperm-count-2021-12-20/