Given the task definition and input, reply with output. In this task, you are given one English sentence. The major part of the sentences talk about health-related topics, but some of the them describe an organization and its activities. Your job is to translate the given sentences into Swedish.

After an incubation period of, usually, 2–3 weeks, disease symptoms may appear but more frequently they do not.

Efter en inkubationstid på normalt 2–3 veckor kan sjukdomssymtom uppträda, men gör det oftast inte.