<prompt> All of the following are true about varicella ExceptPeriod of communicability is 2 days after rashAll stages of rash are seen at the same timeSecondary attack rate is 90Rash commonly seen in flexor area  <response>: - Period of communicability is 1 to 2 days before the appearance of rash and 4 to 5 days thereafter.- Incubation period 14-16 days 10-21- The second attack rate in household contacts approaches 90- In 10-30 may reactivate resulting in herpes zosterPark 23e pg: 144 