Table 1. Geographical occurrence of the most common A. marginale strains.

Strains	Sructure of MSP1a tandem repeats	Number of strains	World occurrence
Most common	τ 22 13 18	7	4x Argentina, 3x Mexico
	α β β β Γ	7	4x Argentina, 2x Mexico, 1x Taiwan
Second common	34 13 4 37	6	6x South Africa
Third common	B B M	5	5x Argentina
	F M M	5	4x Argentina, 1x Mexico

The most frequent A. marginale strains and their geographical occurrence are shown. The most common tandem repeats found among all the A. marginale strains are underlined and there were found more than 60 (M), 80 (β) and 90 (B) times.