Doctors believe three people left gravely ill after eating wild boar are suffering from botulism, a Waikato Hospital spokeswoman says.
"While we don't know the exact cause and source of this illness, we now believe it is botulism. The three patients are responding to botulism anti-toxin and are recovering in hospital.
"We have sent samples off to a specialist centre in Queensland for testing but it may take several weeks before we get the results. We have no evidence to believe there is any public health issue."
Husband and wife Shibu Kochummen, 35, and Subi Babu, 32, and Kochummen's 62-year-old mother, Alekutty Daniel fell ill a week ago after eating what is thought to have been contaminated wild boar. All are stable in the Hamilton hospital's acute ward.
Botulism, a rare and potentially fatal illness, is caused by the bacteria Clostridium botulinum. Symptoms can include vomiting, muscle weakness and paralysis.