Europeans brought many diseases to the Americas. Which disease did they carry back?

Tuberculosis
Smallpox
Typhus
Syphilis
Syphilis was present in the Americas before European contact. It was carried from the Americas to Europe by the returning crewmen from Christopher Columbus's voyage. The first outbreak of syphilis in Europe occurred in 1494 in Naples, Italy, during a French invasion.
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Answers by country

Tuberculosis
Smallpox
Typhus
Syphilis
answers
flagPakistan
1%
14%
3%
80%
55
flagGreece
13%
8%
4%
73%
23
flagGermany
5%
12%
16%
65%
72
flagBelarus
4%
22%
9%
63%
22
flagRepublic of Ireland
4%
16%
20%
58%
24
flagKazakhstan
6%
25%
12%
56%
16
flagItaly
0%
6%
40%
53%
15
flagAustralia
7%
41%
2%
46%
41
flagUnknown
8%
40%
8%
44%
25
flagthe United Kingdom
8%
25%
19%
43%
172
flagUkraine
9%
28%
15%
43%
132
flagRussia
9%
32%
16%
43%
100
flagthe United States
8%
34%
13%
41%
417
flagMalaysia
5%
23%
23%
41%
17
flagCanada
7%
31%
18%
39%
38
flagPoland
8%
23%
29%
38%
17521
flagIndia
7%
40%
16%
35%
229
flagNigeria
0%
66%
0%
33%
12
flagthe Philippines
18%
37%
14%
29%
27
flagSouth Africa
7%
28%
28%
28%
14