Health Minister Saeed Namaki says people should not use school closures to take a holiday.
|The authorities say people driving are spreading the virus|
Iran is limiting travel between its major cities as it tries to halt the spread of the coronavirus, which has killed at least 107 people there.
The country has already shut schools until April, and Health Minister Saeed Namaki said people should not use the break as an opportunity to travel.
He also urged Iranians to reduce the use of paper banknotes.
The measures come as the World Health Organization warned some countries were not doing enough to stop the virus.
But WHO chief Tedros Adhanom Ghebreyesus insisted containment was still possible, adding: "This is not a time to give up."
Iran is one of the worst-hit countries outside China, where the Covid-19 virus - which causes the coronavirus disease - originated.
Worldwide, authorities have confirmed more than 92,000 cases of the virus, of which more than 80,000 are in China.
More than 3,000 people have died globally, the vast majority of them in China.
What's the latest from Iran?
The country's official death toll on Thursday rose by 15 to 107, and the number of confirmed cases increased by 591 to 3,513.
But state news agency Irna said the number of dead could be higher, citing data from medical universities.
The data did not include statistics from the capital Tehran and Gilan province - two of the hardest-hit areas. The toll there was listed as "unknown", Irna said.
Last month sources in the country's health system told BBC Persian the death toll was at least 210, with most victims in Tehran and the holy city of Qom.
Mr Namaki said checkpoints would go up to limit travel between major cities.
In a televised press conference, he said travel was "very dangerous" and reports showed "many cars on the roads are taking the virus with them" to uninfected areas.
He added that schools and universities would remain closed until Nowruz, the Persian new year, on 20 March, which marks the beginning of a national holiday.
"People should not consider this as an opportunity to go travelling. They should stay home and take our warnings seriously," he said.
"This virus is highly contagious. It is a serious matter, do not joke about it."
How are Iranians reacting?
Ladan, an asthma sufferer in Tehran, told the BBC increased stress was the worst aspect of the outbreak for her so far.
"It feels so unsafe now. I quarantined myself without having any sanitizer. I am starting to see everything like a virus. I feel like I am becoming paranoid about whatever I buy and bring into my house," she said.
In the western city of Hamedan Mohammedreza said the crisis had provoked an "epidemic of fear".
A doctor in western Iran who gave his name as Mehrzad told the BBC his hospital had done nothing to prepare for the outbreak as late as a week ago. He said he had ended up buying extra masks and gloves out of his own pocket.
By contrast, in the central city of Isfahan, Mohammad said very few people were taking the outbreak seriously.
"Many believe it is happening anywhere else but Isfahan. You barely see anyone wearing masks or gloves," he said.
"But what is striking is the food prices, which are rising on a daily basis - and everyone buys more than their needs as if a famine is on its way."
What is happening elsewhere?
- Iraq has announced its first two confirmed deaths - one of them in the capital Baghdad - from the virus
- Israel and the Palestinian Authority have put the city of Bethlehem under quarantine after seven people were diagnosed with the coronavirus there
- New York state has 22 confirmed coronavirus cases, Governor Andrew Cuomo says. Eighteen US states now have cases
- California, Washington and Florida states have all declared states of emergency. Ten of the 11 US deaths were in Washington state
- A cruise ship, the Grand Princess, with 21 people who have symptoms is being held off the coast of San Francisco. Thousands of people are aboard the vessel, which is where California's first victim is thought to have caught the virus
- The UK has recorded its first death - an older patient with underlying health conditions. The number of UK people diagnosed with the virus has reached 116, a rise of more than 30 since Wednesday
- Italy reported 41 new deaths, the highest single-day toll so far, bringing its total to 148. The country has closed all schools and universities for at least 10 days
- The Paris Marathon has been postponed to a later date, French media report. About 65,000 runners were registered to take part, Le Parisien said
- South Africa's President Cyril Ramaphosa warned of a "national crisis" after the country confirmed its first case
- The International Monetary Fund has announced $50bn in funding for affected countries
The Department of Consular Affairs under the Ministry of Foreign Affairs has urged Vietnamese in Iran and Italy to stay vigilant as the acute respiratory disease caused by the SARS-CoV-2 (COVID-19) is rampant in those countries.
A judiciary spokesman says the inmates were granted furlough after testing negative for Covid-19.