Waterborne disease outbreaks have historically been traced to inadequate disinfection of drinking water. Which disease among the following has been linked to this issue?

• A. Typhoid, cholera, and dysentery
• B. Legionnaire's disease and bacterial pneumonia
• C. Liver and kidney disease
• D. Blue baby syndrome and diuresis

Answer: (A)

When drinking water isn’t properly disinfected, pathogens from fecal contamination can survive and reach people who drink the water, leading to outbreaks. The diseases most clearly tied to this problem are typhoid fever, cholera, and dysentery. Typhoid fever is caused by Salmonella typhi and spreads through water or food contaminated with feces; cholera by Vibrio cholerae causes severe watery diarrhea that spreads in similarly contaminated water; dysentery, typically due to Shigella, also transmits via contaminated water and results in painful diarrhea. These outbreaks were historically major when disinfection was inadequate. Other options involve different transmission routes or causes—Legionnaire’s disease is linked to contaminated water systems and aerosol exposure rather than simply drinking water, while blue baby syndrome and diuresis arise from chemical contamination or metabolic factors rather than disinfection lapses. Ensuring effective disinfection and proper water treatment prevents these waterborne outbreaks.