China reported its biggest daily jump in new Covid-19 cases in more than two months, as a city on the border with Myanmar in southwestern Yunnan province accounted for all new local cases, according to Reuters.

Ruili’s local government put residents in its urban area under home quarantine, launched a massive testing drive and began restricting people from leaving and entering the city from last week after reporting Covid-19 patients.

The city accounted for all of the 15 new local cases reported on April 4. The total number of new infections, including imported infections originating from overseas, stood at 32, marking the highest total since Jan 31.

Genetic analysis of the cases discovered in Ruili suggest the new local infections stem from viruses imported from Myanmar, state media reported. Of the new patients reported in the city, 11 of them were identified as Myanmar citizens.