A young pregnant woman in Israel has become what is believed to be the first person infected with both Covid and the flu.
She tested positive for both viruses in Beilinson Hospital in Petah Tikva city, Israel, last week.
The woman is suffering mild symptoms.
Professor Arnon Vizhnitser told local media she had problems breathing.
"She was diagnosed with the flu and coronavirus as soon as she arrived," he told Hamodia.
"Both tests came back positive, even after we checked again.
"The disease is the same disease. They're viral and cause difficulty breathing since both attack the upper respiratory tract."
It comes after Israel's health Minister yesterday said the country is extending its offer of a fourth vaccine dose to elderly people in care facilities.
Nitzan Horowitz announced the move on Friday, citing their high exposure and vulnerability to infections.
The professor added they were seeing more pregnant women with flu which can often be confused with Covid.
'This is especially (difficult) when you do not know if it's coronavirus or the flu, so you refer to them the same. Most of the illness is respiratory."
Israel has already extended the rollout of fourth doses to people with weakened immunity.
The country is in the midst of a surge in cases, with more than 5,000 cases recorded yesterday.