In this area, all farmers should vaccinate with '5 in 1' at least. This covers against the five fatal Clostridial diseases that we can see. The vaccine is not particularly expensive, and well worth using.
All farmers should also consider vaccinating with '7 in 1'. This vaccine covers against the five fatal Clostridial diseases as well as two strains of Leptospira. Leptospirosis can cause disease in your herd, like abortions, and red water (bloody urine). But cows commonly get over the disease with little ill effects. The problem is that these cows can constantly shed the Bacteria in their urine. So you and your family can be affected by this. It is best to vaccinate cattle against this disease, especially if you work closely with your cattle.