Research Article
Effect of Immunosuppression on Newcastle Disease Virus Persistence in Ducks with Different Immune Status
Table 1
Groups of ducks used to evaluate the effect of immunosuppression on persistence of Newcastle disease virus under different treatments.
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+: respective treatment administered; −: no treatment; vNDV: velogenic Newcastle disease virus; Groups tabulated as “a”: immunosuppressed and challenged with vNDV disease virus; Groups tabulated as “b”: immunosuppressed but not challenged; Groups tabulated as “c”: not immunosuppressed but challenged with vNDV; Groups tabulated as “d” are controls for group c: not immunosuppressed nor challenged; Group 3: comprises unvaccinated controls for the 4 test groups. |