Table 2.

Coefficients of antigenic similarity (R) between NDV isolates and LaSota strain

Strains	R valuec	345–353 Residues of HN
SD-01-11-Ch	0.04a 0.12b	PDKQDYQIR
JS-07-11-Ch	0.12a 0.12b	PDKQDYQIR
JS-14-12-Ch	0.06a 0.12b	PDKQDYQIR
HeN-01-12-Ch	0.12a 0.12b	PDKQDYQIR
JS-27-13-Ch	0.17a 0.25b	PDKQDYQIR
JS-08-11-Ch	0.35a 0.35b	PDGQDYQIR
JS-15-11-Ch	0.35a 0.5b	PDEQDYQIR
JS-05-12-Ch	0.35a 0.35b	PDEQDYQIR
JS-18-12-Ch	0.25a 0.35b	PDEQDYQIR
JS-22-12-Ch	0.35a 0.35b	PDEQDYQIR

^aChicken embryo cross-neutralization test

^bCross-hemagglutination inhibition test

^c0.67 ≤ R ≤ 1.5, indicates no significant antigenic difference between the two viruses

0.5 ≤ R ≤ 0.67 indicates a minor difference between the two viruses

R < 0.5 indicates a major difference between the two virus strains