潛伏期(Latency Period)

refer from:
www.asbestos.net/medical-glossary/latency-period.html

A latency period, or latent period, is the time between exposure to a disease-causing agent and the onset of the disease. Sometimes the term is used synonymously with "incubation period", and though they not the same, in some cases the latency period and incubation period are the same length of time. The distinction is that the latency period involves the time between exposure and evidence that the disease has manifested (i.e., it is clinically detectable); the incubation period, on the other hand, refers to the period where an individual has been infected with a disease (and it is therefore clinically detectable), but the disease is dormant and asymptomatic. The incubation period ends when the disease becomes symptomatic.

所以大概指的是，若潛伏期是有症狀的，就用latency period；若潛伏期是沒有症狀的，就用incubation period這個字。