A North Wales health chief has warned the new BioNtech/Pfizer vaccine will only be available in small amounts initially.

Teresa Owen, acting deputy CEO of Betsi Cadwaladr University Health Board and its executive director of public health, has urged patience from those wanting immunisation against Covid-19.

The UK has ordered an initial batch of five million doses of the German/American vaccine which will come from Pfizer’s plant in Belgium, with only a proportion of those heading for Wales.

However, Ms Owen said the health board will work hard to get the most vulnerable patients protected first.

She said: “The vaccine has come through all the trials. So, we know it’s safe - there’s rigour to that.

“We aim to work at the pace we need to now, as soon as the vaccine becomes available.

“I am thinking now of days and weeks, no more than that, we will start vaccinating.

“The truth is it’s going to come in small doses initially. I’m not expecting a big drop of vaccine in North Wales.”

The vaccine has to be transported at between -70C and -80C.

As soon as it thaws it lasts for only five days and wholesalers are not allowed to split packs, meaning all 975 doses in a pack must be used as soon as possible.

Ms Owen said: “It’s one of the more challenging vaccines because we need to store it in very cold situations and situations we never normally do with vaccines.

“(The vaccine) is fragile so we can’t necessarily move it around as we would, so it’s not like having a good vial and pulling out vaccines from that.”

The two doses of the new vaccine will be spaced 28 days apart. She said the board was well used to vaccination programmes but she had never seen anything on this scale.

“We have got a fabulous team that look after us on immunisations to make sure we work to the standards, that we follow the right protocols and we are geared up – the training’s in place.

“On this one it’s a step up again, it’s significant, it’s a population level.

“Normally it’s a chunk of the population, so it’s significant and the work is underway.”