If they were persistent or asked questions in a different manner they may be able to convince a parent to immunise their infant, he said.
Board member Greg Gent said it was important that if parents said no to the immunisations, it was a "well informed" no.
Dr Chamberlain said the low rate of immunisation was largely because parents were choosing not to, but partially because of the transient nature of the Northland population.
No Forced Vaccines spokeswoman Katherine Smith said she was in favour of parents' rights to make whatever vaccination decision they thought were appropriate for their children, without coercion.
"If anything goes wrong after vaccination it is parents and children who have to live with the consequences," Ms Smith said.