<prompt> Which of the following is true of chicken pox ?Virus not found in scabVirus can be grown on the chick embryoCaused by RNA virusDoes not cross the placental barrier  <response>: Ans. is a i.e., Virus not found in scab The fluid of vesicle of chickenpox contains virus during first 3 days of illness, but scab is noninfective. About other options Option b VZV does not grow in experimental animal or chick embryo. It can be grown in tissue culture cell lines --- Human fibroblast, hela cells, vero cells. o Option c VZV is a DNA virus. o Option d VZV can cross placenta and infect the fetus. 