Efficacy 95 means 50.
Of those unvaccinated that get infected, 40 to 45% never develop symptoms. 95% efficacy means that percentage of those vaccinated won't get symptoms. That means an effective benefit of 50%. Also, 24% of those infected got it from asymptomatic people. If people think they are free and clear and forego masking, they can still infect others and this is not being disclosed. Human nature will cause a rise of infections when people assume that preventive protocols need not be done because they got the vaccine. Biocloud looks out for others when people won't.