This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
In cholera epidemic which step should be first taken 
Select and explain. 
A. Vaccination to all individuals immediately, B. Primary chemoprophylaxis, C. Cure with tetracycline, D. Safe water supply and sanitation
D: Safe water supply and sanitation
Answer: D: Safe water supply and sanitation 
Explanation: Cholera is an acute diarrheal disease caused by Vibrio cholerae.

I.P.-1-2 days
First step in epidemic of cholera: Verification of diagnosis
First line treatment of choice: water and electrolyte replacement.
In the given question, safe water supply and sanitation should be the 1 st step to decrease mortality from cholera. Also know
Stool appearance of cholera: “Rice watery stool • Chemoprophylaxis of cholera: Tetracycline 500mg BID for 5 days.

Drug of choice for cholera:

Adults: Doxycycline 300 mg stat.
Children: Cotrimoxazole 5mg/kg BID for 3 days
Pregnant female: Furazolidone 100mg QID for 3 days