Sanae Yamamoto's 1926 public-health film showing how one careless person's illness spreads to a household and then a whole town.

Public domain (US): Japanese film published 1926; all works published before 1931 (including foreign works restored under URAA) are public domain in the US (95-year term expired). Source: Internet Archive (https://archive.org/details/SanaeYamamotoEnglish).

Credit: digital copy, English subtitles and title cards courtesy of the National Film Archive of Japan (NFAJ).