For example , 70 to 80 percent of diarrhea is caused by viral pathogens , for which antibiotics are not effective .
Another cause can be physicians not knowing when to prescribe antibiotics or being overly cautious for medical or legal reasons .
70 to 80 percent of diarrhea is caused by viral pathogens , for which antibiotics are not effective .
Another cause can be physicians not knowing when to prescribe antibiotics or being overly cautious for medical or legal reasons .