Table 1.

Prevalence of schistosomiasis and the control strategies operating over different time periods in Hunan province [Refs (1, 5, 6, 8, 24)].

Period	Prevalence of schistosomiasis	Main Control Strategy	Other Strategies
1950s	Human infection prevalence: 20.00%–68.70%. Estimated human cases: over 600,000. Snail infested areas: >2,000km2.	Snail control by environmental modification.	Surveillance. Limited human drug treatment and mollusciciding.
1980s	Human and animal infection prevalence: 5.0%–6.0%. Estimated human cases: >270,000. Snail infested areas: >1,500km2.	Morbidity control by mass praziquantel chemotherapy of humans and animals.	Surveillance. Health education. Snail control with environmental modification and mollusciciding. Safe water provision and improved sanitation.
2003	Human and animal infection prevalence: 3.35% and 4.92%, respectively. Estimated human cases: 205,932. Acute infection cases: 198. Snail infested areas: 1,752.52km2.	Transmission control with integrated approaches mainly targeting human and animal sources of infection.	Surveillance. Praziquantel treatment. Health education. Snail control with environmental modification and mollusciciding. Safe water provision and improved sanitation. Control regulation law enforcement (commenced in 2006).
2018	No active human or animal infections. Estimated human cases: 24,986. Snail infested areas: 1,730.85km2.	Transmission control with integrated approaches mainly targeting human and animal sources of infection.	Surveillance. Praziquantel treatment. Health education. Snail control with environmental modification and mollusciciding. Safe water provision and improved sanitation. Control regulation law enforcement. Fishing banned in Dongting Lake for 10 years commencing in 2019.