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Measles and chickenpox are often confused despite having significant differences in symptoms, severity, and treatment options. We break down the key distinctions between these two infectious diseases, highlighting why measles is significantly more dangerous and why vaccination remains critical for public health.

• Measles starts on head and neck, spreads downward through the body
• Measles is highly contagious with an R0 of 18, spreading through respiratory droplets
• Patients are infectious for four days before and after rash appears
• Serious complications include pneumonia, encephalitis, and potentially fatal SSPE years later
• No specific treatment exists for measles beyond supportive care
• Chickenpox presents as vesicular lesions, commonly on face, chest and back
• Chickenpox is less severe with lower mortality rates than measles
• Antiviral treatments like acyclovir are effective for high-risk chickenpox patients
• Herpesvirus nature of chickenpox means it can reactivate later as shingles (zoster)
• Vaccination has reduced global measles deaths from millions to about 100,000 annually
• Current Texas outbreak has already caused two deaths among unvaccinated individuals

Vaccination saves lives. The diseases we prevent are far worse than unfounded concerns about vaccine safety.