The New South Wales Health Minister, Jillian Skinner, has told State Parliament the Health Care Complaints Commission is launching an investigation into the anti-immunisation group, the Australian Vaccination Network.

The announcement came after the Opposition raised concerns that the AVN was using its Facebook page to encourage parents to join up to a religion, in order to avoid new State Government vaccination laws.

The laws mean unimmunised children will not be able to enrol at child care centres unless their parents have obtained a formal exemption from a GP, and childcare centres that enrol unvaccinated children could be fined up to $4,000.

This morning the AVN posted a message on its Facebook page, encouraging members to join a religion in order to gain exemption from the new vaccination laws the State Government announced yesterday.

The post suggested parents could qualify on religious grounds by joining the 'Church of Conscious Living'.

The Opposition's Dr Andrew McDonald raised the issue in Question Time.

"Minister, what steps will you take to close this loophole?" he said.

After her initial answer, The Health Minister Jillian Skinner later returned to give this update.

"I'm advised that the Health Care Complaints Commission will be launching an investigation into the AVN," she said.

If passed, the new vaccination laws come into effect next January.