although only minor increases in antibody titres could be achieved by repeated vaccination with inactivated ilt vaccine at 2 to 5 weeks after primary vaccination at 10-weeks-old with attenuated or inactivated ilt vaccines , the protection conferred by vaccination with a single dose of the trial inactivated ilt vaccine appeared to be effective for at least 12 months .
C0042212
inactivated
C0042210
vaccine