Fig 3. Induction of virus-specific serum antibodies in 2-week-old chickens in response to oculo-nasal infection with rLaSota and rMex mutant viruses.

Chickens were inoculated with each virus (indicated on the x-axis) by the oculo-nasal route, mimicking natural infection. Sera were collected at 3 weeks post-infection. Virus-specific antibodies were measured by a hemagglutination inhibition assay using rLaSota or rMex/Las Fc virus and chicken erythrocytes.