The decision was announced on Tuesday night following the recommendations of the country’s Covid-19 scientific committee.
More than 120,000 positive cases have been recorded since March but the majority of infections are from recent months.
The health ministry said the new strain of Covid-19 has not been recorded in Tunisia but added that the country was expected to roll out vaccines in April.
Official figures show that the death rate is averaging more than 40 a day and 77% of ICU beds across the country are now occupied.
But there is growing public frustration over the continued restrictive measures to curb the spread of the virus.