The education authorities in Mozambique’s capital, Maputo, say 40 students have tested positive for Covid-19.
The test results came back last week but were announced on Monday by the provincial education director, Deolinda Cossa.
Of the 40 students, 23 study at Casa do Gaiato Reception Centre and had returned to home during the festive season.
The infected students are in institutional and home isolation.
The governor of Maputo province, Júlio Parruque, urged schools to intensify enforcement of public health measures in order to reverse the situation.
Mr Parruque said wearing of face masks, social distancing and handwashing were mandatory.