you'd also want to note the following - while we have been unable to create vaccines for some viruses like aids/hiv, if natural immunity does not exist for this virus then we can't find a vaccine.
so, you have to understand that arguing that we need to wait for a vaccine because we can't rely on immunity is a distressingly ignorant and stupid position, despite being the one that the prime minister and his office appear to be taking.
if we can't build immunity, we can't get a vaccine either. it's the same fucking thing...