Featured Research

from universities, journals, and other organizations

Controlling Schistosomiasis: Buffalo Or Snails?

Date:
January 23, 2008
Source:
PLoS Medicine
Summary:
A parasitic infection common in China and Southeast Asia could be effectively reduced by controlling snail populations, according to research. Infection with schistosomes of various species affects some 200 million people worldwide, and can cause serious chronic illnesses, including liver failure.

Histopathological image of old state of schistosomiasis incidentally found at autopsy. The deposition of calcified eggs in the colonic submucosa suggests prior infection of Schistosoma japonicum.
Credit: Riley S, Carabin H, Belisle P, Joseph L, Tallo V et al.

A parasitic infection common in China and Southeast Asia could be effectively reduced by controlling snail populations, according to new research.

Related Articles


Infection with schistosomes of various species affects some 200 million people worldwide, and can cause serious chronic illnesses, including liver failure. Steven Riley of the University of Hong Kong and collaborators analyzed infection patterns of the parasitic worm Schistosoma japonicum in fifty villages in Samar Province, the Philippines. Rates of infection among humans and animals have been found to differ among villages, and the researchers developed a mathematical model incorporating fecal parasite test results from thousands of people and animals (including, cats, pigs, dogs, water buffalo, and rats) to explain these differences.

Schistosomes are passed from mammals to fresh-water snails via feces, and then cycle back to infect mammals that contact water inhabited by infected snails. Using the mathematical model, the team found that transmission from snails to mammals was a more important factor in explaining the differences among villages than transmission from mammals to snails.

As with all scientific models, the findings of this one depend on the assumptions made to build the model. Nevertheless, the findings suggest that interventions to reduce the size of the snail population and the exposure of mammals to parasite-containing water might reduce human infection levels more effectively than interventions that interrupt other parts of the parasite's life cycle.

The results also indicate that the contribution of water buffaloes to human S. japonicum infection in the Philippines is not particularly important. This finding contrasts with a recent study that identified water buffalo as the major mammalian reservoir for S. japonicum in China and suggests that further studies of t he transmission of S. japonicum by water buffalo are warranted before efforts are dedicated to treat or vaccinate water buffalo as a control measure against human S. japonicum infection.

In a related perspective article, Song Liang and Robert Spear, who were not involved in the study, discuss the findings and conclude that the "modeling approach can be a useful tool in exploring schistosomiasis transmission in other settings, and may even apply to other macroparasites."

Journal citation: Riley S, Carabin H, Belisle P, Joseph L, Tallo V et al (2008) Multihost transmission dynamics of Schistosoma japonicumin in Samar Province, the Philippines. PLoS Med 5(1): e18.http://medicine.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pmed.0050018


Story Source:

The above story is based on materials provided by PLoS Medicine. Note: Materials may be edited for content and length.


Cite This Page:

PLoS Medicine. "Controlling Schistosomiasis: Buffalo Or Snails?." ScienceDaily. ScienceDaily, 23 January 2008. <www.sciencedaily.com/releases/2008/01/080122102221.htm>.
PLoS Medicine. (2008, January 23). Controlling Schistosomiasis: Buffalo Or Snails?. ScienceDaily. Retrieved November 27, 2014 from www.sciencedaily.com/releases/2008/01/080122102221.htm
PLoS Medicine. "Controlling Schistosomiasis: Buffalo Or Snails?." ScienceDaily. www.sciencedaily.com/releases/2008/01/080122102221.htm (accessed November 27, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Thursday, November 27, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Pet Dogs to Be Used in Anti-Ageing Trial

Pet Dogs to Be Used in Anti-Ageing Trial

Reuters - Innovations Video Online (Nov. 26, 2014) Researchers in the United States are preparing to discover whether a drug commonly used in human organ transplants can extend the lifespan and health quality of pet dogs. Video provided by Reuters
Powered by NewsLook.com
Today's Prostheses Are More Capable Than Ever

Today's Prostheses Are More Capable Than Ever

Newsy (Nov. 26, 2014) Advances in prosthetics are making replacement body parts stronger and more lifelike than they’ve ever been. Video provided by Newsy
Powered by NewsLook.com
From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

Newsy (Nov. 25, 2014) The US FDA is announcing new calorie rules on Tuesday that will require everywhere from theaters to vending machines to include calorie counts. Video provided by Newsy
Powered by NewsLook.com
Daily Serving Of Yogurt Could Reduce Risk Of Type 2 Diabetes

Daily Serving Of Yogurt Could Reduce Risk Of Type 2 Diabetes

Newsy (Nov. 25, 2014) Need another reason to eat yogurt every day? Researchers now say it could reduce a person's risk of developing type 2 diabetes. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins