Microbiology Unknown:?

Do you know where the sample was obtained? If it was from a pond where there are birds, it's more likely to be E. cloacae. Your urea hydrolysis results seem to imply that you have E. aerogenes - a considerably larger percentage of E. aerogenes strains are negative for urea hydrolysis, but a lysine decarboxylase test or an arabinose ferment would definitely clinch it.