"People with chickenpox can spread the virus to others from up to five days before the rash appears and until five days after the rash appears. They are most contagious from the day before and for the first few days after the rash appears. To help reduce the spread of chickenpox, children with the illness should be kept away from daycare or school until five days after the rash first appears. It usually takes two to three weeks from the time there is contact with the virus until a person gets sick. If your child is exposed to chickenpox, watch for signs of the illness for the next two to three weeks."
"Prevention methods may include a medication called Acyclovir, an injection of Varicella Zoster Immune Globulin (VZIG) or the varicella vaccine. The VZIG shot may prevent chickenpox, if given within 96 hours after being near a person who has chickenpox. VZIG is available for certain people at higher risk of complications, such as pregnant women, people with weakened immune systems and some newborn infants. Acyclovir is available for other groups of people that are at high risk of complications of the illness. In addition to pregnant women, newborn babies, and people with certain immune system problems, Acyclovir may be used for people over 13 years of age, children over one year of age with chronic skin or lung disorders, and children on chronic aspirin treatment. This medication must be prescribed by a doctor and given within the first 24 hours after the rash starts. Acyclovir is not recommended for healthy children who get chickenpox.
Healthy people who have not been vaccinated and have not had chickenpox, but get exposed to the chickenpox virus can lessen the severity of the illness by getting vaccinated within the first 3 to 5 days after their first exposure."
(from here, if you wish more information. Short answer, I think it's probably too late, if you were exposed a week ago.
no subject
"Prevention methods may include a medication called Acyclovir, an injection of Varicella Zoster Immune Globulin (VZIG) or the varicella vaccine. The VZIG shot may prevent chickenpox, if given within 96 hours after being near a person who has chickenpox. VZIG is available for certain people at higher risk of complications, such as pregnant women, people with weakened immune systems and some newborn infants. Acyclovir is available for other groups of people that are at high risk of complications of the illness. In addition to pregnant women, newborn babies, and people with certain immune system problems, Acyclovir may be used for people over 13 years of age, children over one year of age with chronic skin or lung disorders, and children on chronic aspirin treatment. This medication must be prescribed by a doctor and given within the first 24 hours after the rash starts. Acyclovir is not recommended for healthy children who get chickenpox.
Healthy people who have not been vaccinated and have not had chickenpox, but get exposed to the chickenpox virus can lessen the severity of the illness by getting vaccinated within the first 3 to 5 days after their first exposure."
(from here, if you wish more information. Short answer, I think it's probably too late, if you were exposed a week ago.