One of the current front runners, is said to be being developed in Britain now, at Cambridge. And since it involves a synthetic way of stimulating the bodies own cell to produce antibodies, without using real viral parts, it is said that if it works it will be ridiculously cheap, and that a litre will make a two hundred thousand or more shots, giving a price per shot of less than pence.

But of course it may not work, and if any are found and require collecting fresh viral samples each time, then they could be hugely expensive, hundreds of dollars each shot, and therefore only a luxury for rich private patients. It is just a roll of the dice how much the vaccines, if any, will cost, so it is hard to predict if they will or can be rolled out globally.