On Monday, New York officials reported the death of a child in Lewis County, the state’s first such death in 30 years. On Wednesday, Pennsylvania officials announced their sixth measles-related death this year in Jefferson County. On Thursday, Wisconsin announced an infant death in the southwest part of the state, where an outbreak has spread to 13 counties and infected 431 people.

In one week, the U.S. had as many measles deaths as it did from 2001 to 2022. On Nov. 6, the U.S. Centers for Disease Control and Prevention (CDC) reported 5,164 confirmed measles cases nationwide, the highest number in 35 years. The CDC also reported an additional 18 cases among foreign tourists who were infected while visiting the U.S. However, the measles tracker at Johns Hopkins University reports 5,400 confirmed cases because it draws upon data gathered directly from state and county health officials.