  The present study evaluated In vitro effect of gentamicin sulfate and
ceftiofur sodium on the viability of the Marek's disease virus. The titer of
cell associated turkey herpesvirus (HVT) vaccine was not appreciably reduced
when incubated with 50 mg/ml of gentamicin sulfate or ceftiofur sodium.
Statistic difference was not found between the number of plaqueforming units
(PFU) of reconstituted vaccine associated with both antibiotics 0, 15, 30 and
60 minutes after reconstitution of vaccine. The antibiotics did not
considerably alter the pH values. There was a significative decrease of the
titer of all vaccinal solutions when they were inoculated 30 and 60 minutes
after the reconstitution of the vaccine. Nevertheless, these titers are higher
than the required titers to protectect against the Marek disease.
