NEW YORK (AP) — Vaccination rates for U.S. kindergarteners dropped again last year, and federal officials are starting a new campaign to try to bring them up.

Usually, 94% to 95% of kindergarteners are vaccinated against measles, tetanus and certain other diseases. The vaccination rates dropped below 94% in the 2020-2021 school year, during the first year of the COVID-19 pandemic.

A Centers for Disease Control and Prevention study released Thursday found rates dropped again in the 2021-2022 school year, to about 93%.

The pandemic disrupted vaccinations and other routine health care for childre...