Hello. My step-daughter, who lives next door, just called me and told me that she believes that two of her four children are showing signs of chickenpox (that they have little red blisters all over). We are always around each other and the kids are always at the house and vice-versa. Am I contagious? Can I spread chickenpox or shingles to others? Do I need to disinfect the entire house? What is the time frame for this disease to be infectious? Thank you.