Sales records of vaccines. [Photo: Agencies]

Authorities in Hong Kong are moving to limit the number of non-resident children who will be allowed vaccinations at government-funded clinics.

The decision comes amid fears mainland families will end up flocking to the city for inoculations amid the current vaccine scandal on the mainland.

Starting tomorrow, Hong Kong's Maternal and Child Health Centres will only accept 120 non-resident children a month for vaccinations.

Non-resident children will only be given an appointment when there is extra room.

The fees for their shots will also be higher.

Authorities in Macau have also launched similar restrictions, limiting government-sponsored vaccinations to residents only.

Mainland authorities have launched a series of criminal investigations after discovering that a mother and daughter had been illegally trading vaccines worth close to 90 million US dollars on the black-market to hospitals for close to 5-years.

The vaccines themselves were made by licensed producers, but were not kept refrigerated, meaning they could be ineffective.

Around 70 different criminal cases involving over 130 people have been launched in the fall out from this month's scandal.