Essential for diagnosis
At the early stage of onset, the disease is similar to common cold while after 1 to 2 day(s) of fever, reddish maculopapule will appear on the skin and eruption distributes all over starting from the head and face to limbs and the trunk, finally forming patches. After I to 2 day (s) of fever, the fever will abate gradually, so will the maculopapule. After the vanishment of maculopapule, desquamation may appear, but no pigmentation exists.
The general symptoms are mild, but lymphadenhypertrophy of retroauricutar, cervical and occipitoposterior regions exists.
If the disease occurs during the epidemic period,the patient may have the contact history in most cases.
Leukopenia and relative classified lymphocytosis occur; direct immunofluorescence test shows that viral antigen may be discovered in the pharyngeal secretion.