Table 2.

Types of cercariae damage.

Damage Type	Description
Type I normal movement	Fast swimming employing tail movement
Type II resting position	Floating in a vertical position without movement
Type III sinking to the bottom	No movement; sinking to the bottom
Type IV crawling at the bottom	Spasmodic motion at the bottom
Type V normal movement with tail detachment	Active crawling of the cercarial body at the bottom
Type VI agony	Occasional twitches at the bottom
Type VII death	No activity
Type VIII death with tail detachment	No activity; the tails detached