Pennsylvania's measles outbreak has grown to 890 cases after officials confirmed 55 new infections.

The outbreak is heavily concentrated in the state's traditional Amish settlements, the article reports.

Health experts say cultural factors and lower baseline vaccination rates there have complicated the response.

Nursing teams are going door to door to deliver vaccines, educate families, and monitor symptoms.

Local clinics are handling a steady influx of children who need urgent care.

The CDC has faced scrutiny for initially excluding certain local deaths from its main tracking figures.

Analysts suggest the reporting gaps stem from strict verification criteria, the piece says.

An NBC News headline cited says America had wiped out measles, and now babies are infected at birth.

Doctors warn infections could keep climbing if vaccination efforts face more resistance.

Read the full article on Pennsylvania's growing measles outbreak and the response.