Which public health measures are effective in reducing hydatid disease in endemic regions?

• A. Deworming dogs, proper disposal of offal, and public education
• B. Screening only at clinics
• C. Vaccinating humans
• D. Eliminating all dogs from communities

Answer: (A)

Interrupting the transmission cycle between dogs and livestock is the most effective way to reduce hydatid disease. The parasite’s adult tapeworm lives in dogs, who shed eggs in their feces. Humans and other hosts become infected by ingesting those eggs from contaminated hands, food, or water. So, strategies that target the source of infection and the exposure pathway work best.

Deworming dogs with a drug like praziquantel reduces the number of dogs carrying and shedding the tapeworm, cutting the environmental contamination with eggs. Proper disposal of offal prevents dogs from feeding on infected organs from livestock, which stops the parasite from moving from livestock to dogs in the first place. Public education is essential to ensure communities understand how eggs spread, promote good hygiene, safe meat handling, and consistent practices like regular deworming and offal disposal. Together, these measures disrupt the parasite’s life cycle and lower disease risk far more effectively than screening alone, which doesn’t reduce transmission; human vaccination isn’t available or proven as a control strategy; and eliminating all dogs is neither practical nor ethical.