so with all these lock-downs and closures, just what is the criteria for re-opening?
considering the last I saw of a viable vaccine being about 18months away, just how long are the predictions?
It was discussed before but I would take any vaccine time line estimations with an enormous pinch of salt. From what I've seen they are taking lead candidates from SARS and MERS research and testing them against this virus. That makes perfect sense but the rate limiting step is producing enough vaccine for clinical trials, recruiting participants and checking the data. They may accelerate these processes, and 12-18 months is possible, but it's very much a perfect case situation.
However, once the vaccine has been developed they then need to produce it and get it to the most at risk people first. This means setting up a facility that can reliably produce large quantities of the vaccine and this isn't simple. Scale up of any drug production can have very large issues. You then need to produce enough to vaccinate your at risk people. In the US alone, going on 70+ years of age only, that's between 35 and 36 million people. Compare this with the number of births, as most vaccines are given to children, which is about 4 million. In other words, you need to produce ten times as much vaccine for this one thing than is currently produced for any other vaccine (even vaccines/boosters given at other ages will be tied to the number of births). After the SARS and MERS epidemics they did start to plan for such an eventuality, but unsurprisingly, for reasons we really can't discuss, this was stopped almost as soon as SARS was eradicated.
The next issue is these viruses tend to mutate quickly. It's likely any such mutations which persist will make lower mortality rates, and it's possible that some learned immunity may aid in fighting off new strains, but the vaccine may not be effective. Similar to the flu vaccine which isn't 100% and we've been exposed to flu for long enough that there is inherited immunity present in the population. As such, any mutations could cause similar outbreaks and the cycle will need to be repeated.
Thinking a vaccine is going to do much for this immediate situation is likely a forlorn hope.