How does chicken pox occur?

Respiratory or touch: Wild chickenpox is transmitted by infected patients from 24 hours or more before the first spots for 6 days after the first ones appear.It can pass as airborne particles or through direct contact with secretions.A few hours in the room with a patient can pass it to a susceptible person.After passage, it incubates from 10-21 days before causing spots.A vaccine is available to prevent it.