prophylaxis
noun [ U ] medical specialized uk/ˌprɒf.ɪˈlæk.sɪs/ us/ˌproʊ.fɪˈlæk.sɪs/
（疾病）预防
treatment or actions taken to prevent a disease
Antibiotic prophylaxis refers to the use of antibiotics to prevent infection. 抗生素预防指使用抗生素防止感染。