Health care providers administered more than 100,000 doses of Moderna’s COVID-19 vaccine to first-time recipients, the state Department of Health said Wednesday, despite earmarking those shots for individuals receiving a second dose.

The cumulative error dates to early January, although health officials said they first discovered the problem over the weekend. About 100,000 residents will see their immunization appointments rescheduled in the coming weeks, including between 30,000 and 60,000 set to receive the second dose, Secretary of Health Alison Beam said.