Comment Comment by ethbr0 Chickenpox is caused by varicella zoster, which is a herpes virus. Which is why it can linger and re-emerge as shingles decades later.https://en.m.wikipedia.org/wiki/Varicella_zoster_virushttps://en.m.wikipedia.org/wiki/Smallpox#CauseSimilar symptoms, substantially different family trees. parent ethbr0 4 years ago
https://en.m.wikipedia.org/wiki/Varicella_zoster_virus
https://en.m.wikipedia.org/wiki/Smallpox#Cause
Similar symptoms, substantially different family trees.