More than 500 people are currently in intensive care in Tunisia, a level previously unseen in the North African country.
Tunisia on Sunday started a week of coronavirus restrictions covering the Eid holiday, as hospitals battle to stay afloat amid soaring COVID-19 cases.
Prime Minister Hichem Mechichi said on Friday that Tunisia was going through “the worst health crisis in its history” and that health facilities were at risk of collapse.
Until next Sunday, mosques, markets and non-essential shops must close, gatherings and family or cultural celebrations are banned, and people are forbidden from travelling between regions.
An overnight curfew begins at 7pm (18:00 GMT) instead of 10pm, and is in force until 5am.
Schools have been closed since mid-April.
Shops along Tunis’s central Habib Bourguiba Avenue and in the old city were all closed on Sunday, a correspondent of the AFP news agency said.
But videos shared on social media appeared to show almost normal activity in several other parts of the country, including people without masks and failing to respect social distancing.
The Eid al-Fitr holidays that mark the end of Ramadan are traditionally a time when Muslim families and friends get together.
This year, the holiday is expected to begin on Thursday.
Tunisia, a country of almost 12 million, has officially recorded more than 319,000 coronavirus cases and 11,350 deaths.
More than 500 people are currently in intensive care, a level previously unseen in the North African country.
The country has set up field hospitals to deal with the influx of patients.
It is also struggling to meet its oxygen needs, and has appealed for assistance from European countries and even neighbouring Algeria, struggling with its own health crisis.
A vaccination campaign launched in mid-March, a month later than planned, is moving slower than anticipated.
“The number of patients in hospitals has almost doubled in just a month,” said Amen-Allah Messadi, a doctor on the country’s COVID-19 scientific task force.
He added that oxygen consumption had “multiplied by four or six”.
“The situation is very serious,” he said.