Which infectious human disease has been eradicated?

smallpox
leprosy
cholera
typhus
After vaccination campaigns throughout the 19th and 20th centuries, the WHO certified the eradication of smallpox in 1979. The fact that humans are the only reservoir for smallpox infection, and that carriers did not exist, played a significant role in the eradication of smallpox. So far, it is the only eradicated infectious human disease.
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Answers by country

smallpox
leprosy
cholera
typhus
answers
flagPakistan
85%
8%
2%
4%
48
flagRepublic of Ireland
85%
7%
7%
0%
14
flagMalaysia
83%
0%
11%
0%
18
flagIndia
69%
11%
9%
7%
246
flagthe Netherlands
69%
7%
0%
23%
13
flagthe United States
68%
12%
7%
9%
481
flagSouth Africa
66%
16%
8%
0%
12
flagthe United Kingdom
64%
14%
9%
9%
141
flagAustralia
64%
14%
11%
8%
34
flagUnknown
64%
7%
14%
14%
14
flagthe Philippines
63%
16%
13%
6%
30
flagItaly
61%
16%
5%
16%
18
flagGermany
59%
15%
11%
13%
110
flagCanada
58%
12%
15%
10%
39
flagPoland
45%
16%
21%
15%
14994
flagSweden
45%
18%
18%
9%
11
flagNigeria
42%
35%
7%
14%
14
flagSwitzerland
32%
16%
21%
29%
37
flagGreece
28%
57%
7%
7%
14
flagAustria
25%
41%
16%
16%
12