The coronavirus vaccine may give people immunity from the disease for 90 days, the government's scientific advisers have said.
A paper published by the New and Emerging Respiratory Virus Threats Advisory Group said the duration of "natural or vaccine induced immunity is not yet fully understood".
However, they added that immunity after getting a Covid-19 jab may last 90 days. Scientists wrote: "Based on the variability in the data and differential responses in the population we conservatively estimate that a protective immune response after SARS-CoV-2 infection or vaccination may last for 90 days." Their estimate is based on the fact that other coronaviruses tend to reinfect after one to two years.