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The Differences Between Chickenpox and Other Childhood Diseases
Unlike measles, chickenpox doesn't need a certain population size in order to survive. It can pop up later in life as shingles. Zoster has this amazing survival strategy that allows it to persist in these and even small nomadic populations rather than needing the agricultural revolution to take hold. Instead of being vertically transmitted, like so many other herpes viruses, this is still a horizontally transmitted pathogen.