Obsolete term for a male public health nurse; the modern equivalent is 保健師 (ほけんし), which is gender-neutral.
See also: 保健師
There used to be male public health nurses called 保健士, but now the term has been unified to 保健師.
Compound of 保健 (health) and 士 (professional suffix, often male-specific in older usage). The term was replaced by 保健師, which uses the gender-neutral suffix 師.