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| Stage | Infectivity | Clinical features | Duration |
|---|---|---|---|
| Incubation period | Noninfectious | Asymptomatic | 7-21 d(Mean: 13 d) |
| Prodrome | Infectious | • Fever• Lymphadenopathy:Periauricular, cervical,axillary, and inguinal• Myalgia• Fatigue | 1-3 d |
| Prodrome | Infectious | • Fever • Lymphadenopathy: Periauricular, cervical, axillary, and inguinal. • Myalgia • Fatigue |
1-3 d |
| Infectious | |||
| Infectious | |||
| Non-infectious |
