Japan will soon launch a system to allocate extra doses to the most vaccine-starved municipalities as it seeks to rectify the ongoing shortage of Pfizer Inc.'s COVID-19 shots, which has thwarted some local governments' rollout efforts.

Starting in August, the central government will set aside a certain quantity of Pfizer doses that prefectures can distribute to municipalities that need them the most.

The move comes amid simmering frustrations among some municipalities that their rollout schedule has been thrown into disarray due to a shortage of doses.