種牛痘 [种－－]

Jyutping zung2 ngau4 dau6
Pinyin zhòng niú dòu

Definitions (Wiktionary)
  1. verb, verb-object
    to vaccinate against smallpox
    (syn.) 種痘, 種珠, 种珠, 种痘, 點痘子, 種汞, 種花, 点痘子, 种花, 种汞

種牛痘 [种－－]

Jyutping zung2 ngau4 dau2
Pinyin zhòng niú dòu

Definitions (粵典–words.hk)
  1. 動詞
    接種​天花​疫苗​；​天花​嘅​疫苗​係​由​牛痘​發​展出​嚟​嘅​，​接種​之​後​會​喺​手臂​上面​留低​一撻​疤痕
    to get vaccinated for smallpox; literally "to plant cowpox"