Vaccine effectiveness against Omicron drops to zero within six months but natural immunity remains robust for at least a year, a new study from Qatar in NEJM has found.
Natural immunity from previous infection remains strong against Omicron, a study from Qatar has found, with 56% protection against reinfection and 100% protection against serious disease and death.
A recent study from Qatar shows that people who acquired natural immunity to the original Wuhan strain had excellent protection against severe disease from later variants, some of which were more virulent.
Qatar is pushing for unvaccinated footballers to be barred from next year's World Cup, which will be hosted in the country, with fans already having to prove they have had two jabs to attend matches.
