one shot of 3-4ml of dectomax is all thats needed but yeah they need to be kept out of the "infected" land/shed for at leasy 17 days. The lice that cause scab cannot live for more than 17 days max without a host (sheep) so in theory there could be a small percentage of lice that can reinfect sheep on land/gates/bushes etc up to 17 days after sheep are taken away from that field
If a flock is injected with Dectomax say last November and mix with other sheep with scab over the winter on commonage will the treated sheep be immune for a period ?
