The 31-year-old woman from Spain became infected with the Delta variant followed by the Omicron variant of the virus in under three weeks.
However just days after she returned to work in January she began to show symptoms of the virus - a cough and fever as well as feeling generally unwell - and tested positive.
Her case, which is being presented to the European Congress of Clinical Microbiology and Infectious Diseases in Portugal, is believed to be the shortest known gap between infections.Dr Recio said:"People who have had COVID-19 cannot assume they are protected against reinfection, even if they have been fully vaccinated.
"Nevertheless, both previous infection with other variants and vaccination do seem to partially protect against severe disease and hospitalisation in those with Omicron. "This case also underscores the need to carry out genomic surveillance of viruses in infections in those who are fully vaccinated and in reinfections.Work by the Office for National Statistics suggests the risk of reinfection is 10 times higher with the Omicron variant compared with the Delta variant.
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