Equine flu vaccination?

Yup you can ride after the horse should have no adverse effects of the vaccination. Some horses have a stiff neck for 12-24 hrs after vaccination so maybe just dont ask him for a lot of bend or collection but other then that he'll be fine ... although he might not be in the best of mood's but every horse is diffrent just like people. Some take the shot and go back to work some go home and complain for a day. Either way you won't do any harm to him by riding afterwards,