Roch Courreges Elementary School (Picture: Google Maps)

Thousands of schoolchildren may have been given flutes which were contaminated with a music teacher’s semen.

Parents have been warned about the allegations, which claim the tainted instruments were handed out during lessons.

An investigation is underway into the alleged ‘inappropriate sexual conduct involving a musical performer’ that affected at least 13 school districts in California.

People who were given flutes have been urged to put them in a paper bag and hand them to police for testing.

‘The performer distributes a flute-like musical instrument made of PVC pipe or bamboo to students during a music lesson, and the allegation is that he contaminated some of these instruments with semen,’ Joan Lucid, superintendent of the Saugus Union School District, notified parents on Saturday, the Orange County Register reported.

The type of flutes given out by the charity (Picture: Fountain Valley School District)

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The teacher, who worked with the charity Flutes Across the World, has not yet been identified.

A parent named only as Nate went to police station in Fountain Valley on Friday night to turn in a flute given to his child, who attends Courreges Elementary School, KNBC-TV reported.

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‘It’s disgusting, it’s unreal, you can’t even really fathom it,’ another parent, who wished to not be named, told the station.

‘It made me sick to my stomach.’

The charity Flutes Across the World gives out flutes to pupils asking them to paint them, and they will the be distributed to needy children. It has provided musical presentations at several local school districts.

Its website and Facebook page are not currently working.

Messages seeking comment from founder John Zeretzke were not immediately returned.

Several Southern California districts notified parents by email on Friday and Saturday that a performer was being investigated.

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Presenters at such programmes ‘are never alone with children’ but the performer won’t return to the district out of ‘an abundance of caution,’ the Fullerton School District said on its website.

The Philharmonic Society of Orange County sponsored some of the programmes.

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Spokesman Chantel Uchida said of the allegations: ‘We’re so shocked and disgusted.

‘We will be stepping back from this. There are no plans to continue it in the future.’