"The heterozygote tva(s1/r1) and the resistant genotype tva(r2/r2) tva(r3/r3) and tva(r4/r4) were detected in Chinese chickens by direct sequencing. The resistant genotype tvb(r/r) was detected in JNBRC CB07 CB12 CB14 and CB15 by pyrosequencing."xsd:string