潜伏期
incubation period

8月19日，国家卫健委办公厅、国家中医药管理局办公室印发了《新型冠状病毒肺炎诊疗方案（试行第八版）》。

The incubation period for COVID-19, the time between exposure to the virus and the onset of symptoms, is about three to seven days for most people and can be up to 14 days, during which these pre-symptomatic patients can be contagious, according to the latest guideline.
试行第八版诊疗方案提出，新冠肺炎的潜伏期（感染病毒到出现症状之前）多为3到7天，最长可达14天，潜伏期即有传染性。

The five days after symptoms occur is when the disease becomes highly transmissible, the guideline said.
发病后5天内传染性较强。