A member of the Iranian Health Ministrys Infectious Diseases Center has called for injection of booster doses amid a new wave of Covid that is expected to last for at least two weeks more.
Babak Eshrati says those who are infected should stay at home for at least five days after their symptoms are no more there to help the disease be curbed.
He said students are of special concern here as children normally contract less severe Covid but they spread the virus faster.
Iran confirmed 634 new cases of Covid on Sunday as well as 22 deaths.
Over 145,000 people have so far lost their lives to Covid in Iran since the pandemic struck the country three years ago.
Earlier, Irans Health Ministry had categorized 19 cities as red or high risk on its coronavirus-tracking map, as the number of patients diagnosed with Covid-19 continues to surge countrywide.
In the latest updates to the map, released Friday, the number of red cities rose from 10 to 19, while 45 cities were classified as orange or moderate risk.
The number of yellow or low risk cities increased from 194 to 233.
The situation is still blue or normal in 153 cities, with the figure showing a gradual decline with a rise in infections.
On Friday, the Health Ministry said 1,140 people were diagnosed with Covid-19, out of whom 29 lost their lives, in 24 hours.