<prompt> Measles is infective for:One day before and 4 days after rashFour days before and five days after rashEntire incubation periodOnly during scabs falling  <response>: MeaslesEnglish Measles is spread through respiration contact with fluids from an infected person;s nose and mouth, either directly or through aerosol transmission, and is highly contagious -- 90 of people without immunity sharing a house with an infected person will catch it. The infection has an average incubation period of 14 days range 6-19 days and Period of communicability in measles is approximately 4 days before and 5 days after the appearance of the rash. Measles is an infection of the respiratory system caused by a virus, specifically a paramyxovirus. REF : ananthanarayana 10th ed 