Define and classily diarrhea. Write down the common causative agent of diarrhoeal disease in Bangladesh?

Q. 21. Define and classily diarrhea. Write down the common causative agent of diarrhoeal
disease in Bangladesh?
Diarrhea:-  Passage of three or more loose or watery stools in a 24 hours period is called diarrhea.
 Classification of diarrhea :-
A. According ot duration :-
1. Acute diarrhea : This  term refers to diarrhea that begins acutely lasts leas than 14 days.
2. Chronic/ persistent diarrhea :- The term diarrhea that begin acutely but last for two weeks or longer.
B. According to clinically (Clinical Classification) :-
1. Acute watery diarrhea :- This term refers to diarrhea that begins acutely, last less then 14 days and marked by the passage of frequent loose or watery stool without visible blood.
2. Invasive diarrhea (dysentery) :- This is diarrhea with visible blood in the faeces.
3. Persistent diarrhea :- This is diarrhea that begins acutely but last for two weeks or longer. The episode may begin as watery diarrhea or dysentery.
 Classification of diarrhea :-
A. According to duration :-
1. Acute diarrhea :- This term refers to diarrhea that begins acutely, lasts less than 14 days.
2. Chronic/persistent diarrhea :- This term diarrhea that begin acutely but last for two weeks or longer.
B. According to clinically (Clinical classification ) :-
1. Acute watery diarrhoea : This term refers to diarrhoea that begins acutely, last less then 14 days and marked by the passage of frequent loose or watery stool without visible blood.
2. Invasive diarrhea (dysentery) :- This is diarrhea with visible blood in the faeces.
3. Persistent diarrhea :- This is diarrhea that begins acutely but last for two weeks or longer. The
(ii) Viral infections :-
- Chicken pox (varicella )
- Measles (Measles virus/paramyxovirus)
- Mumps (Mump virus/paramyxovirus)
- Influenza (influenza virus)
- Small pox (Virus)
b) droplet nuclei :- Disease spread by droplets are spread by droplet nuclei.

c) Infected dust infections:-
-Tuberculosis (M. tuberculosis)
- pneumonia
- Streptococcal infection.
- Staphylococcal infection
- Psittacosis
B. Disease due to inhalation of air borne harmful