also: ひとひとかんせん
noun
human-to-human transmission
Used in medical and epidemiological contexts to describe the spread of a disease directly between people.
このウイルスはヒトヒト感染が確認されている。
Human-to-human transmission of this virus has been confirmed.
ヒトヒト感染を防ぐためにマスクの着用が推奨
Wearing masks is recommended to prevent human-to-human transmission.