Credit: NATIONAL INSTITUTES OF HEALTH/SCIENCE PHOTO LIBRARY

Caption: Biomphalaria glabrata snail, parasite host. Underwater footage of the air-breathing freshwater snail Biomphalaria glabrata (formerly Australorbis glabratus). This snail is the host for the parasitic trematode flatworm Schistosoma mansoni. This is one of several flatworms that cause the tropical disease schistosomiasis. Eggs are expelled into lakes and rivers in urine from infected humans. The eggs hatch into larvae, infect aquatic snails, and develop into cercariae. After leaving the snail, the cercariae infect humans who enter the water. The mature adult form lives in veins around the bladder, where the females lay many hundreds of eggs that accumulate in body tissues and cause damage. These snails were filmed in Puerto Rico, as part of an educational film produced by the Communicable Disease Center (CDC) for the US Public Health Service. Published in the USA in 1947.

Release details: Model release not required. Property release not required.

Keywords: 1900s, 1940s, 1947, 20th century, american, animal, aquatic, australorbis glabratus, bilharzia, biological, biology, biomphalaria glabrata, black-and-white, cdc, communicable disease center, education, educational, epidemiology, fauna, flatworm, flatworms, gastropod, host, intermediate, invertebrate, medical, medicine, mollusc, monochrome, mute, nature, no-one, nobody, north america, north american, parasite, parasitic, parasitology, phs, public health service, puerto rico, schistosoma mansoni, schistosomiasis, snail, snail fever, trematode, tropical, tropics, under water, underwater, united states, us, usa, water, wildlife, zoological, zoology

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Biomphalaria glabrata snail, parasite host

K005/6498 Rights Managed

Downloadable master

Duration: 00:00:19.24

Frame size: 640x480

Frame rate: 29.97

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 87.7M

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Capture format: Unknown

Codec: MPEG-4 Video

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