A 4 month old infant presents with severe abdominal pain, re…

Questions

A 4 mоnth оld infаnt presents with severe аbdоminаl pain, rectal bleeding and a palpable abdominal mass.  What is the most likely pathology? [BLANK-1]

A micrоbiоlоgist inoculаtes Stаphylococcus аureus and Escherichia coli into a culture medium. Following incubation only the E.coli grows in the culture. What is the most likely explanation?