ATLANTA — Another Georgia school district is switching to virtual learning, after three school bus employees died from COVID-19.

The 9,700-student Griffin-Spalding County school system made the announcement late Monday, citing a disruption in student transportation.

Districts across Georgia are struggling to line up enough drivers and monitors to keep buses running. In Savannah, some bus drivers staged a sickout for the second day on Tuesday after a similar protest Friday.

At least 210,000 Georgia students in 54 districts and charter networks have had their school schedules disrupted because of COVID-19. Some districts have taken days off, some shifted to every-other-day schedules and some sent home individual schools or grades. That’s more than 12% of Georgia’s 1.7 million public school students.

The number of COVID-19 patients in Georgia hospitals remains above 6,000, the highest level since the start of the pandemic. The number of newly reported cases has decreased in recent days, although cases remain near all-time high levels.

More than 34,000 COVID-19 cases have been reported among Georgia children aged 5-17 in the two weeks ended Sept. 2, according to state data, with more than 125 infection clusters reported in K-12 schools during that period.