The Australian Vaccination Network (AVN), which is actually anti-vaccine, is fighting an order to change its name.

It claims to be a lobby and support group that promotes health choices.

But the New South Wales Fair Trading Department says that is misleading because it is, in fact, an anti-vaccination group.

New Zealand father Ian Williams has become the latest vocal campaigner in favour of vaccination.

He and his wife had not vaccinated their children, but then their son got a cut on his foot, and the situation became very serious.

"It took a stay of 24 hours in hospital for them to diagnose it was tetanus, because the spasms started getting worse and worse," he said.

"It's a terrible thing. Your whole body arches, your arms go up in the air."

Mr Williams says the vaccine controversy is difficult to navigate.

"It looks like, when you go into it, there's a whole lot of pros and cons, and there's a 50-50 argument," he said.

In reality, almost 100 per cent of doctors are pro-vaccine.

The Australian Vaccination Network sounds like an organisation that would agree with Mr Williams' views that vaccination is a life saver, but it does not.

In fact, it actively promotes the link between vaccination and autism, a theory that was debunked by the medical world 20 years ago.

The NSW Department of Fair Trading has ordered it to change its name, but the AVN is resisting the order in court.

The parties will be back in court on Friday.

New South Wales Opposition health spokesman and paediatrician, Dr Andrew McDonald, says the AVN's name is a serious problem.

"This is all about false advertising. The Australian Vaccination Network, a vehement anti-vaccination group, who are doing whatever they can to keep their name near the top of a Google search," he said.

"They're number two on a Google search if you use the words 'Australia' and 'vaccination' and that's why they want to preserve their name to keep it there."

AVN accused of attacking pro-vaccine campaigners

Journalist Jane Hansen has been heading up a recent campaign at Sydney's Sunday Telegraph designed to raise vaccination rates.

"Anyone who criticises the AVN - and this is journalists, politicians or even parents that have had sick children who have gone public with their views on vaccination - very quickly find themselves on the end of some pretty vile attacks," she said.

"They pride themselves on this all natural approach but there's no peace, love and lentils if you criticise them.

"They come at you, criticising you of being on the payroll of 'Big Pharma'."

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Dr McDonald has also felt their sting.

"We've had the police around our office following and they've investigated threatening emails to this office," he said.

PM has contacted the founder of the AVN, Meryl Dorey, to respond to those allegations.

Dr McDonald says it is time for doctors to educate the community about the consequences of non-vaccination.

"The tragedy is that we are now seeing as much whooping cough as I did 30 years ago," he said.

"We've just had a major epidemic of measles in Campbelltown.

"Unless we improve our immunisation rates, we are at risk of future epidemics."