How are smallpox and chickenpox distinguished from each other?

Totally different: Viruses and the manifestations of the diseases caused by them are similar only by the formation of blisters (vesicles) in the skin. Two important ways to tell them apart, chickenpox is most concentrated on the face and torso and smallpox on the face and extremities. Chickenpox lesions are in all stages of development and smallpox lesions look all the same.

1 exists 1doesn't: Chickenpox is a human only viral infection that is often experienced in childhood.A vaccine is available to prevent it.Chickenpox is relatively low risk with 1death/80, 000 cases.Smallpox was a human only viral infection that last caused disease in the wild in 1978.It was high risk, 30% of cases were fatal. The world health organization declared smallpox extinct.