Infection of the umbilical remnants ('navel ill') is a common and significant condition affecting large animal neonates. The umbilicus contains the umbilical vein, a pair of umbilical arteries and the urachus (Table 1). These structures may become infected alone or in combination (Table 2). The umbilical arteries and urachus were reported as the most commonly affected structures in the horse, versus the urachus and umbilical veins in cattle.
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