According to a finding published in the medical journal Pediatrics, a single dose of chicken pox vaccine may be inadequate to guard against chicken pox spurt in schools.
Dr. Sandra L. Snow and colleagues from the Arkansas Department of Health conducted a study during an outbreak of chicken pox at one of the schools. They observed that 96% of the 545 children attending the school had not suffered chicken and had taken the vaccination, and 14 among them had been given 2 doses of the vaccine.
It was found that 43 of the 48 students who developed chickenpox had received the vaccines and the most vulnerable classroom for maximum chicken pox spread was the first grade classroom, where all pupils had received the vaccine. It was noted that, those vaccinated had the disease in a milder form and did not have to miss school for more than 2 days.