FIG 2.

Generation of chimeric or mutated TMUVs for duck transmissibility studies. The colored bars indicate the origin of the viral protein (red, FX2010; blue, MM1775). The viruses were rescued in a background of FX2010 (A) or MM1775 (B). Whether virus transmission occurred was determined based on the seroconversion of specific TMUV antibody in contact ducks that were cohoused with originally inoculated ducks at 14 days postcontact. The transmissibility of each virus is specified on the right of the figure.