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Table 4 Geographic origin of H. pylori strains.

From: Geographic distribution of methyltransferases of Helicobacter pylori: evidence of human host population isolation and migration

Continent Country Number of strains Percentage
Europe   146 66.1
  Portugal 106 48.0
  France 11 5.0
  United Kingdom a) 8 3.6
  Germany 6 2.7
  Sweden 9 4.1
  Norway 6 2.7
Africa   38 17.2
  Portuguese with African origin b) 20 9.0
  Egypt 7 3.2
  Burkina Faso 11 5.0
America   27 12.2
  USA c) 1 0.5
  Costa Rica 6 2.7
  Mexico 6 2.7
  Argentina 14 6.3
Asia   10 4.5
  Singapore 10 4.5
Total   221 100.0
  1. a) Includes sequenced strain 26695;
  2. b) Strains isolated from African patients with Portuguese residence were considered African;
  3. c) Includes sequenced strain J99.