Table 1.

HI titers of antisera and MAbs

StrainTiteraICPIbPathotypec
NDV serumMAb 7B7MAb 7D4MAb 5A1MAb 4D6
LaSota E13-12563205,1204010,2400.31Lentogenic
NDFL1282,56010,2401,28010,2400.00Lentogenic
NDFLtag25664010,2402010,2401.28Mesogenic
NDFLtagHPA1282,5602,56064010,2401.18Mesogenic
Hitchner B12568032010,2400.11Lentogenic
Herts1282,5601.86Velogenic
Texas GB12810,24010,2401.64Velogenic
  • a Expressed as the reciprocal of the highest serum dilution that caused inhibition of hemagglutination. Results for control serum and APMV3 serum were in all cases negative.

  • b Determined as described by Alexander (1).

  • c Lentogenic strains, ICPI < 0.7; mesogenic strains, ICPI 0.7 to 1.4; velogenic strains, ICPI > 1.4.