Since the outbreak of the global pandemic in early 2020, Chad has recorded a total 7,417 cases and 194 deaths from Covid-19.
Last week, a total 33 new cases were reported in the capital N'Djamena alone.
"In view of the epidemiological situation of the Covid-19 pandemic both worldwide and in Chad in particular... all preventative measures against disease, particular mask-wearing and social-distancing, must be adhered to," the health ministry said in a statement.
The ministry said that vaccination "remains strongly recommended for the entire population."
The African Development Bank has said that Covid-19 "likely exacerbated poverty rates" in the landlocked country.
Chad is ranked by the United Nations as the third-least-developed country in the world and suffers from very high rates of deaths in childbirth, with one child in every five dying before reaching the age of five.