Efforts to accelerate and scale up vaccine production are ongoing and modelling of vaccine supply and demand is underway. However, it cannot be known at this point how many doses of vaccine will be required to bring the epidemic under control. The number of doses required and their availability will depend on the outcome of clinical trials as well as recommendations and decisions on populations to be vaccinated beyond the trials.
the theory of evolution works also for virus and bacteria, they tend to adapt quick and mutate to vaccines or drugs found. So it is a constant run between researcher and disease to get faster and find their weakness. When it happens, when scientists found it, then you need money to produce it.
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