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. 2002 Nov 4;99(23):15107–15111. doi: 10.1073/pnas.242574599

Table 2.

Prevalence of vacA s-region allotypes in samples from East Asia, Western countries, or Venezuela

s allotype
Percent of sample showing specified allotypes
East Asia (n = 15)
Western countries (n = 15)
Venezuela
Puerto Ayacucho (n = 17) Caracas (n = 13)
s1 100 67 94 46
s1a 27 20 0 0
s1b 0 47 36 46
s1c 73 0 58 0
s2 0 33 6 53
*

s allotype was determined by sequence of PCR products using primers VAIF and VAIX as described.

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