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Rumored ‘measles parties’ elicit a warning in California

February 10, 2015, 6:30 PM UTC
Demand For Measles Vaccine Increases As Outbreak Started At Disneyland In California Spreads
MIAMI, FL - JANUARY 28: In this photo illustration, a bottle containing a measles vaccine is seen at the Miami Children's Hospital on January 28, 2015 in Miami, Florida. A recent outbreak of measles has some doctors encouraging vaccination as the best way to prevent measles and its spread. (Photo illustration by Joe Raedle/Getty Images)
Photograph by Joe Raedle — Getty Images

This post is in partnership with Time. The article below was originally published at Time.com.

Parents who are fearful of vaccines should not intentionally expose their children to the measles, California health officials warned Monday, amid rumors of “measles parties” in local media.

The California Department of Health said it “strongly recommends against the intentional exposure of children to measles. It unnecessarily places the exposed children at potentially grave risk and could contribute to further spread.”

No known “measles parties” have been thrown to date, but the expression started cropping up in local media reports after a San Francisco radio station reported that a local mother had offered to arrange a play date between sick and healthy children.

Officials have confirmed 59 cases of the measles across the state, 42 of which have spread through Disney (DIS) theme parks.