<prompt> Infective period of chicken pox is2 days before and 2 days after rash appearance2 days before and 5 days after rash appearance4 days before and 4 days after rash appearance4 days before and 5 days after rash appearance  <response>: Chicken Pox Synonym: Varicella Causative agent : Varicella zoster virus Incubation period: 14-16 days Source of infection : Case person-to-person contact Mode of transmission : Air droplets respiratory Period of communicability : 1-2 days before to 4-5 days after appearance of rash Secondary Attack rate : 90 Rash: Dew drop on rose petal Apperance. Centripetal distribution pleomorphic rash Ref: Park 25th edition Pgno : 157 