SCIENCE IN THE NEWS DAILY
In Good Health? Thank Your 100 Trillion Bacteria
from the New York Times (Registration Required)
For years, bacteria have had a bad name. They are the cause of infections, of diseases. They are something to be scrubbed away, things to be avoided.
But now researchers have taken a detailed look at another set of bacteria that may play even bigger roles in health and disease: the 100 trillion good bacteria that live in or on the human body. No one really knew much about them. They are essential for human life, needed to digest food, to synthesize certain vitamins, to form a barricade against disease-causing bacteria. But what do they look like in healthy people, and how much do they vary from person to person?
In a new five-year federal endeavor, the Human Microbiome Project, which has been compared to the Human Genome Project, 200 scientists at 80 institutions sequenced the genetic material of bacteria taken from nearly 250 healthy people. They discovered more strains than they had ever imagined -- as many as a thousand bacterial strains on each person. And each person's collection of microbes, the microbiome, was different from the next person's. To the scientists' surprise, they also found genetic signatures of disease-causing bacteria lurking in everyone's microbiome. But instead of making people ill, or even infectious, these disease-causing microbes simply live peacefully among their neighbors.
Subscribe to Our Content!
Visit our RSS Feeds page to choose among 13 customized feeds, or create a free My AmSci account to request an email notice whenever a specified author, department or discipline appears online.
A free daily summary of the latest news in scientific research. Each story is summarized concisely and linked directly to the original source for further reading.
An early peek at each new issue, with descriptions of feature articles, columns,
and more. Every other issue contains links to everything in the latest issue's table of contents.
News of book reviews published in
and around the web, as well as other noteworthy happenings in the world of science books.
To sign up for automatic emails of the
Update and Scientists' Nightstand issues, create an
online profile, then sign up in the
My AmSci area.
Science in the Media
Magazines and Web Sites:
The Science-Media Intersection: