A customer of the cafe posted a photo to Twitter on Tuesday afternoon showing a cartoon which promoted anti-vaccination messaging displayed on the counter next to the mandatory Check-in CBR QR code.

The cafe owner, who The Canberra Times has chosen not to name, removed the sign when approached about it, saying it was initially put up as a joke.

The ACT Health Minister Rachel Stephen-Smith has called on Canberrans to access COVID-19 vaccine and health information from trusted sources in light of the incident.

"I think the majority of Canberrans understand the benefits of a COVID-19 vaccine for themselves and the wider community," Ms Stephen-Smith said.

"Throughout COVID-19, we've seen the community respond positively to health advice and be very receptive to requirements and information."

Ms Stephen-Smith urged residents to check the credibility of sources for health information and speak to their doctor about any concerns.

"I urge all Canberrans to access information about COVID-19 vaccines from trusted sources only," she said.

"ACT Health and Commonwealth government channels provide up to date, factual and reliable information for people to stay informed.

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"Throughout COVID-19, we have listened to the advice of public health experts who have the knowledge and experience to guide us through the pandemic.

"We will continue to take appropriate action based on the best evidence available and the advice of health experts."

The ACT is among the top performers nationally in the race to vaccinate against COVID-19 with almost 20 per cent of the eligible population aged above 16 fully vaccinated.

It came after unofficial QR codes with the message "you are complicit in your own surveillance" were placed over some ACT government QR check-ins.

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