**5.6 Subsequent disorders**

The probability of subsequent clinical mastitis increases in cows once infected with mastitis. As the affected udder act as reservoir for the pathogen, the affected cows increase the spreading of mastitis in the herd. Cows having experienced one case of clinical mastitis often develop a subsequent case of clinical mastitis later in lactation. Mastitis is associated with increased risk of lameness, ketosis, displaced abomasum (LDA/RDA), and paresis and fertility problems. The economic cost of various disorders and fertility problems arise after mastitis and it is also included in the total cost of mastitis [55–57].
