Ingelvac PRRS KV Dosage and administration Administer a 2 ml dose by deep intramuscular injection, in the neck muscles behind the ear, according to the following vaccination scheme: Primary vaccination course Gilts: Two injections three to four weeks apart, at least three weeks before mating. Sows Two injections three to four weeks apart. Vaccination of all sows in the herd within a short period is recommended. Revaccination One injection at 60 – 70 days of each pregnancy, starting from the first pregnancy following the primary vaccination course.