Therefore,
simultaneous
vaccination with live Ulster 2C strain
intra-
nasally,
Inactivated
LaSota strain
subcutaneously
injected
into the base of the skull at 1 day old,
And a booster vaccination with live Ulster 2C or B1 strian intra-nasally at 7-day-old was effective against the challenge with vNDV at 28-day-old.