People who have been infected with Covid-19 in the past year are likely to be protected against reinfection for several months, a Public Health England (PHE) study has found.
PHE has been regularly testing tens of thousands of health care workers across the UK since June for new Covid-19 infections as well as the presence of antibodies, which suggest people have been infected before.
Scientists working on the study have concluded naturally acquired immunity as a result of past infections provide 83% protection against reinfection, compared to people who have not had the disease before. This appears to last at least for 5 months from first becoming sick.
This means people who contracted the disease in the first wave may now be vulnerable to catching it again.
Between 18th June and 24th November, scientists detected 44 potential reinfections (2 ‘probable’ and 42 ‘possible’ reinfections) out of 6,614 participants who had tested positive for antibodies. This represents an 83% rate of protection from reinfection.
PHE also warned that although those with antibodies have some protection from becoming ill with COVID-19 themselves, early evidence from the next stage of the study suggests that some of these individuals carry high levels of virus and could continue to transmit the virus to others.
It is therefore crucial that everyone continues to follow the rules and stays at home, even if they have previously had COVID-19, to prevent spreading the virus to others.
Remember to wash hands regularly, wear face coverings and make space from others to help reduce the likelihood of passing on the virus.
Professor Susan Hopkins, Senior Medical Advisor at Public Health England said: “This study has given us the clearest picture to date of the nature of antibody protection against COVID-19 but it is critical people do not misunderstand these early findings.
“We now know that most of those who have had the virus, and developed antibodies, are protected from reinfection, but this is not total and we do not yet know how long protection lasts. Crucially, we believe people may still be able to pass the virus on.
“This means even if you believe you already had the disease and are protected, you can be reassured it is highly unlikely you will develop severe infections but there is still a risk that you could acquire an infection and transmit to others.
“Now more than ever it is vital we all stay at home to protect our health service and save lives.”
