South Carolina reported 847 measles cases on Friday, state health data showed, including 58 additional infections since Tuesday, as officials warned the widening outbreak could last weeks or months amid lagging vaccine uptake.

There are currently 443 people in quarantine and 20 in isolation. The latest end of quarantine for these is February 24, the state health department said.

The outbreak, which began in October, has been centered in the northwest part of the state, which includes Greenville and Spartanburg, according to the South Carolina Department of Public Health.

Of those infected, 760 were unvaccinated, 15 were partially vaccinated with one of the recommended two-dose measles-mumps-rubella vaccines, 20 were fully vaccinated and 52 had unknown vaccination status.

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(Reporting by Mariam Sunny and Siddhi Mahatole in Bengaluru; Editing by Krishna Chandra Eluri)