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

Table 4 Geographic origin of H. pylori strains.

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

a) Includes sequenced strain 26695;
b) Strains isolated from African patients with Portuguese residence were considered African;
c) Includes sequenced strain J99.

ISSN: 1471-2180