[Silent, no sound]

[This tape was duplicated from a 16mm film by Erickson Archival for the National Library of Medicine, July 2003. NLM call number HF0772.]

[A Communicable Disease Center Study Film. US Public Health Service. Federal Security Agency.]

[Australorbis Glabratus. Host of Schistosoma mansoni in Puerto Rico.]

[This is assembled film footage not used in "Manson's Blood Fluke." Its value is restricted to students of helminthology.]

[Snails moving up and down grass stems in water.]

[Microscopic views of cells growing.]

[Snails moving up and down on grass stems in water.]

[Close-up view of snails in water.]

[Snails moving up and down on grass stems in water.]

[The end. CDC 4 - 066.0]