Summary

Neonatal isolated suppurative submandibular sialadenitis (NISSS) is rare, with only 21 cases described in the English literature. All cases, with the exception of one, were caused by Staphylococcus aureus. In this case report, we describe a preterm neonate with NISSS due to infection by S aureus and Klebsiella pneumonia presenting on day 11 of life with submandibular swelling and low-grade fever. Possible contributors for the development of the infection include prematurity, neutropenia, prolonged orogastric feed and bacterial virulence. Antibiotic treatment was effective. To the best of our knowledge, this is the first case report of NISSS caused by a mixed flora.