Typically, airborne viruses are the hardest to contain.

This is what happened in families before mass vaccination and medical breakthroughs made death from airborne viruses and bacteria rare.

The droplets settle about one metre away, unlike airborne viruses that are more worrying because they can travel further distances.

The HEPA filter, he noted, removes dust particles as well as airborne contaminates, which include airborne viruses as well as bacteria.

An intensive research and development effort resulted in a patented plasma technology that offers a unique and safe way to kill airborne viruses.