Thanks for asking on HealthcareMagic. Generally the conditions are caused due to certain viruses and are self correcting unless associated with bloody diarrhea. If the stool is blood stained, it is more likely to be caused due to invasive bacteria like Shigella and certain variety of E.coli. Amoebiasis is a condition caused by certain parasites like Entamoeba or Giardia. These are less frequent. In fact, viral causes are more frequent but are are unlikely to be associated with steaks of blood as in this case. It is unlikely that unless backed up with definite investigation that the previous cause was amoebic (since other causes are more likely). Even in case it really was, chances of it being due to the same cause is very low. Runny nose, fever and cough are likely to be unrelated to the cause of blood streaks in stool. It is generally due to certain viruses. Runny nose would not cause bloody stools.