The cause of infantile diarrhoea is true
A.
mild diarrhea is mostly extraintestinal(肠外) infection
B.
severe diarrhea is mostly intestinal(肠内) infection
C.
the main cause of infantile diarrhoea is the infection factor
D.
Duovirus(轮状病毒)and pathogenic Escherichia coli(致病性大肠杆菌) are the most common intestinal infections.
E.
all of the above statements are true