A 6 year-old girl is brought to your office by her mother be…
A 6 year-old girl is brought to your office by her mother because of a rash. The mother first noticed the rash 1 day ago. The mother reports that several kids in the child’s school have come down with chicken pox but that the child has received all of her immunizations including two doses of the varicella vaccine. You observe the child actively playing with the toys in your waiting room before both the mother and child are brought back. The child has a temperature of 100.4 degrees F, a pulse of 90 beats per minute, a blood pressure of 100/70 mmHg and a respiration rate of 20 breaths per minute. The physical examination is unremarkable except for 20 vesicles on erythematous bases sparsely scattered on the child’s trunk and limbs. Which of the following is the most likely diagnosis?