Measles

No new measles cases reported last week for first time since January

Measles
Measles virus. Photo: BSIP/Universal Images Group via Getty Images

No new cases of measles were reported the week of Sept. 6–12 to the Centers for Disease Control and Prevention for the first time since January.

Why it matters: Despite the milestone, public health officials warn that this does not mean the outbreak is over, particularly as other countries and 2 New York counties continue efforts to stem their outbreaks. Measles is an extremely contagious disease with harmful side effects that range from possible lowered immunity to other diseases to death, though infection is largely preventable via vaccination.

Go deeper: Read Axios' full coverage of the measles outbreak here.

New measles cases decline in U.S., but the outbreak isn't over yet

Data: Centers for Disease Control and Prevention; Chart: Harry Stevens/Axios

U.S. measles cases have been dropping over the past couple of weeks, with 7 cases reported the week ending Sept. 5. Only 2 of those cases were new illnesses, the Centers for Disease Control and Prevention announced Monday.

Why it matters: Most cases are in unvaccinated people, whose infections often originated from travelers from countries where "large measles outbreaks are occurring," CDC said. And while the numbers here have dropped, it only takes one unvaccinated group for the extremely contagious virus to establish a new foothold.