Before revision:  the conditional entropy ? of vaccination distribution. Furthermore, travel activity across regional borders that accelerated infection spread so far is found to rather sup-press it if vaccination is processed at a high pace .
After revision:  the conditional entropy Hc, when we distribute vaccines to regions. The efficiency of this strategy, which maximizes Hc, was found to outperform that of vaccinating regions with a larger effective re-generation number. This law also explains the surprising result that travel activities across regional borders that accelerated infection spread so far is found to rather sup-press it if vaccination is processed at a high pace .