Health professionals are expecting a fourth Covid-19 vaccine dose will be less popular in its uptake.
A second booster - or fourth dose - is now available for everyone aged over 50, as well as health, aged-care and disability workers over the age of 30.
The Ministry of Health recommended people stay up to date with vaccinations but significantly fewer people have received their first booster dose than the first two jabs.
Similarly, Rotorua-based GP Cate Mills said she knew an announcement was imminent but did not know it had happened until contacted by RNZ.
She now could have patients ask for it today and has previously had some inquire.
Rotorua is in the Lakes District Health Board area, where just over 67 per cent of eligible people have had the first booster shot.
It is the second-worst rate among DHBs for boosters, slightly above its neighbour Bay of Plenty (other DHBs have worse first and second dose rates).
With more than a quarter of people nationally who turned up for the first two Covid-19 vaccinations not returning for a third, Mills expected those eligible would be even less interested in a fourth dose.
"It might only be 50 per cent," she said.
Otago University epidemiologist Nick Wilson was expecting more than half of those eligible for the fourth dose to take it.
"I would hope it would be much higher."
He wanted people to get vaccinated to keep them out of hospital and help ease the strain on the health system.
But he said many may only be able to get the fourth dose once winter was over - noting people were not supposed to get the jab within three months of having Covid-19 and must wait six months after their last shot.
Wilson said the six-month wait should be shortened "maybe even down to three or fourth months".
He suggested decisions around that could wait until officials saw what the actual fourth dose uptake was like.
Pasifika GP Network chair Dr Api Talemaitoga wanted to be optimistic but ultimately thought there was Covid-19 fatigue and convincing people to get a fourth dose would be a "hard sell".
"People are tired of hearing about the Covid messages," he said.
"A lot of people have had Covid in Aotearoa and may think 'that's enough - I don't need to have the booster shot because I've already had Covid'."
Talemaitoga said officials could not leave it to medical professionals to get the message out because they were already exhausted.