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Di laman Escherichia coli O104:H4:

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Escherichia coli O104:H4 adalah suatu strain bakteria Escherichia coli enterohemoragik yang jarang, dan penyebab bagi wabak Escherichia coli O104:H4 2011.[perlu rujukan] Huruf "O" di dalam pengkelasan serologi mengenal pasti dinding sel antigen lipopolisakarida , dan huruf "H" mengenal pasti antigen flagella .