The most likely diagnosis of Gastroenteritis based on the presence of  organisms which can ferment lactose and its inability to ferment sorbitol is called enterohemorrhagic E. coli.
This is referred to a type of pathogen which is a strain of E.coli and causes severe intestinal infection thereby damaging it and leading to bloody diarrhea being observed. Individuals can be infected through food sources such as raw or uncooked meat etc.
This organism mentioned above also has the ability to ferment lactose but not sorbitol and is usually treated using rehydration therapy and requires blood transfusion in sever cases.
This is therefore the reason why Enterohemorrhagic E. coli was chosen as the most appropriate choice.
Read more about Enterohemorrhagic E. coli here https://brainly.com/question/8782363
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