Clinical Mastitis

Clinical cases of mastitis are those where the cow displays definitive symptoms of the disease. These may be acute, where the disease flares up relatively suddenly in a formerly healthy cow; these cases may be further defined as per-acute, where the rapid onset of severe inflammation, pain and systemic symptoms results in a severely ill cow within a short period of time, or sub-acute mastitis, the most frequently seen instance of the disease, where the few symptoms tend to be mild inflammation in the udder and visible changes to the milk, such as small clots.

Long-term recurring persistent cases of the disease are termed chronic. These cases may show few symptoms between repeated occasional flare-ups of the disease where symptoms are visible and can continue over periods of several months. Often with chronic mastitis, irreversible damage is caused to the udder from the repeated clinical occurrences of the illness, and often these cows are culled.