Even the smallpox vaccine had only 95% effectiveness. It turns out that 95% effectiveness, herd immunity and the fact that smallpox is a DNA virus with low muta

Even the smallpox vaccine had only 95% effectiveness. It turns out that 95% effectiveness, herd immunity and the fact that smallpox is a DNA virus with low mutation rate (RNA viruses like covid19 have much higher mutation rate and as such a lot more variants reducing effectiveness of any given vaccine over time) was enough to eradicate Smallpox. But that doesn't mean that the vaccine was 100% effective, as an other poster pointed out, some vaccinated children still got infected with small but the vaccine reduced the risk drastically https://daraj.com/wp-content/uploads/2021/04/5a2b8126-e638-49be-8f0a-b222fb74215d.jpg https://daraj.com/wp-content/uploads/2021/04/5a2b8126-e638-4...