As the Government races to vaccinate as many people as possible against the coronavirus, some are wondering if they're already immune to the disease.
This week Public Health England released a study which had followed almost 21,000 NHS workers for close to five months. It found that those who suffered from the coronavirus and had symptoms had a 90 per cent chance of avoiding falling unwell again with the disease over the next five months.
When people who had caught the virus but had been asymptomatic were taken into account, that number fell to 83 per cent. PHE's Siren Study will now continue to see how long natural immunity tends to last for among people who've caught the bug.