A Spanish health care worker has reportedly tested positive for two variants of SARS-CoV-2 just 20 days apart—the shortest-known interval between infections.
The 31-year-old woman, who was fully vaccinated and boosted, tested positive with the Delta variant in late December and then with Omicron in January, the BBC reported, citing Spanish researchers.
Dr. Gemma Recio, the study’s author, told the European Congress of Clinical Microbiology & Infectious Diseases that the case highlighted that Omicron can “evade the previous immunity acquired either from a natural infection with other variants or from vaccines.”
She said that “people who have had COVID-19 cannot assume they are protected against reinfection, even if they have been fully vaccinated.”