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Ranchers.net
I've never had a case before in the 18 some years we've run cattle here, but I guess there's a first time for everything and consequently have never vaccinated for it. I took two weaned calves to the vet on monday that acted like they couldn't see and generally just dumb acting. They had a high fever, nasal discharge, and in his opinion the signs of h. somnus. He doctored them with nuflor and vitamins.
I'm not sure how contagious this is so I've isolated the two that were doctored, sorted through the others and see no others with any symptoms. Moved 'em to a clean pasture and water source monday afternoon.
Yesterday we vaccinated all the weaners with Somubac, Virashield 6, and backpour with ivermectin. I was going to work them on friday anyhow but was spurred into action.
The vet recommended that I begin feeding my calves a tetracycline medicated cake for at least 7 days to ward off any additional cases while the vaccine has a chance to start building some immunity.