TABLE 1.
Strain | Passage no. | Hemagglutination assay titera | Amino acid at position 190b |
---|---|---|---|
BOL/96 | 2 | <4 | −c |
3 | 8 | K | |
4 | 64 | Q | |
5 | 128 | Q | |
ALV/96 | 2 | <4 | −c |
3 | 16 | K | |
4 | 126 | Q | |
5 | 256 | Q |
Hemagglutinating assay titer is expressed as the reciprocal of the highest dilution of allantoic fluid agglutinating an equal volume of 1% chick erythrocytes.
Deduced amino acid at position 190 of the virus HA, determined by sequencing of amplification products.
−, no amplification product detected.