VERMONT — After months of having some of the fewest coronavirus cases in the country, Vermont is now trying to contain an outbreak that has hit an immigrant community in a small but densely populated city.

What health officials described as a small cluster in Winooski that they first noticed on Memorial Day has jumped to 83 cases and expanded into neighboring Burlington and other surrounding communities. No hospitalizations or deaths have been reported.

About 40% of the cases have been in children. As of Monday, only 17% of those who tested positive showed any symptoms of COVID-19, Vermont Health Commissioner Dr. Mark Levine said.

Compared with larger states, Vermont’s current outbreak is small. But for several weeks before the Winooski outbreak, the number of new cases reported in Vermont was frequently in the low single digits, with occasional days with no positive cases. Vermont has 55 COVID-19 deaths.