Transmission of Chicken Pox
Chicken Pox is transmitted from person to person by droplet infection, and by droplet nuclei. Most patients are infected by “Face to face”, (personal) contact. The portal of entry of the virus is through the respiratory tract. Since the virus is extremely labile, it is unlikely that fomites play a significant role in its transmission. Contact infection undoubtedly plays a role when an individual with Herpes Zoster is an index case. The virus can cross the placental barrier and infect the fetus, a condition known as Congenital Varicella.

Incubation Period of Chicken Pox
Usually, the incubation period is about 14 to 16 days, although extremes as wide as 21 days have been reported.