A health and safety review is under way after three Waikato prisoners were infected with campylobacter.
A total of 62 prisoners at Spring Hill Corrections Facility told staff they felt unwell amid a mass illness that was believed to have started on Christmas Eve.
Acting deputy prison director Megan Tuhoro said three prisoners were confirmed as having campylobacter and had since recovered.
READ MORE:
• New Corrections Māori strategy: Prison should not traumatise inmates more than loss of liberty
• Ombudsman: Northland's Ngawha Prison conditions breach Convention against Torture
• Inmate seriously injured at Auckland's Paremoremo Prison
As of Wednesday, no prisoners at the site have reported symptoms of gastroenteritis.