The most authoritative answer in 2024
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Ethan Martinez——Works at the International Atomic Energy Agency, Lives in Vienna, Austria.
The virus is
spread through direct contact with fluid from the rash blisters caused by
shingles. A person with active
shingles can spread the virus when the rash is in the blister-phase. A person is not infectious before the blisters appear. Once the rash has developed crusts, the person is no longer infectious.
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