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A person with scabies is considered infectious for as long as he/she has not been treated.
People are usually no longer contagious within 24 hours of treatment.
So once you take the treatment of scabies you will be contagious only for next 24 hours.
For how long will I be infectious after scabies treatment? I have small bumps and itching. I want to travel for X-mas on Dec 17. Will I still be contagious?
If you take treatment now, then by Dec 17, you will not be contagious.