Public Health England (PHE) has published the results of a study indicating that infection from coronavirus (COVID 19) results in some naturally acquired immunity for at least five months. However, this has come with a warning from experts that those people may still be able to transmit the virus, despite not suffering reinfection, as they can carry it in their throat and nose. PHE therefore has stressed the importance of everyone continuing to follow the rules, including those that have already had the virus.