As Japan's delta-induced fifth wave of COVID-19 wanes and the inoculation campaign continues, scientists are continuing to gather more data on vaccines and their effectiveness against the highly contagious variant.

While vaccines do not offer 100% protection against delta, or any other form of the virus, public health experts have repeatedly found that COVID-19 shots are effective at preventing hospitalizations and visits to emergency departments.

Here are some key questions and answers regarding COVID-19 shots and the delta variant: