The new discovery is unrelated, according to s, a Dutch wire agency.
Medics did not reveal what condition the patient had, how old they were, or whether they were vaccinated.
She and her team studied how the virus from nine Covid-19 patients in London changed over time, concluding that new variants may occur in immunocompromised patients.
Heathrow said it is not forecasting a return to profit and dividends this year despite an increase in outbound demand for travel.
Its surveillance study, which is based on swabs of 120,000 people and considered the best way of measuring the outbreak, estimates 3.
The Office for National Statistics suggests 38.