My daughter communicated with the girl-friend who in 3 days was ill with a chicken pox. Tep...

[Peter]

My daughter communicated with the girl-friend who in 3 days was ill with a chicken pox. Now we are afraid to go to holiday before the efflux or expiration 21 days. Heard, that in Moscow there is a test for a virus causing a chicken pox. Where to address?
Yours faithfully, Peter.

[The doctor]

Such tests are, but they reveal or tap a virus only when illness or disease has begun, instead of in an incubation interval or a delitescence.