jaylucy. Yes - infectious stage starts two days before the blistery spots, continues until they are "crusted" or dried over with scabs. So the infected person could be at large for those two days. However, usually a person has symptoms similar to a bad cold, runny nose, feeling poorly etc. If it is known that ch/pox is in the area then schools can advise parents, for example, to keep children at home if they have the cold-type symptoms.
Talk to me about Dog Walkers (please! 😊)
from someone who estranged from daughters for more than 20 years