How a pregnancy test for humans caused a wave of global extinctions
2013 05 17

By Joseph Bennington-Castro | io9.com


The deadly fungus Batrachochytrium dendrobatidis has been wiping out amphibian species across the globe for decades. But how did this global environmental disaster get started? A new study suggests that it came from doctors importing frogs for use in pregnancy tests.

Since the 1980s, amphibian species have experienced a sharp decline in their numbers. Some estimates suggest that 400 or more amphibian species have gone extinct or near extinct since the die-offs began. Scientists eventually pinpointed the major cause of the devastation: chytridiomycosis, a disease brought on by an infection by the fungus Batrachochytrium dendrobatidis, or Bd.

When Bd fins its away into an amphibian, it severely thickens the animal’s skin, disrupting its ability to breathe and take in nutrients. Some species have a 100 percent mortality rate — but others survive the infection, seemingly unaffected by the fungus.

One Bd-resistant species is the African clawed frog (Xenopus laevis). About a decade ago scientists suspected that this particular species may have served as a carrier, and facilitated the spread of chytridiomycosis, when they found Bd in a museum specimen dating back to 1934.

And now, a new analysis now links the spread of the fungus in the U.S. with the spread of X. laevis, which initially began in the early 1900s. You see, at this time people were importing large numbers of the amphibian for use in research and to use as pets. Doctors eventually discovered that the African clawed frog could also be used as a pregnancy test, further increasing the number of frogs imported.

The pregnancy test worked by injecting a woman’s urine under the skin of a female frog. If the woman was actually pregnant, her hormones would stimulate ovulation in the frog. In the 1960s, doctors phased out this practice for more reliable pregnancy tests based on hormonal readings, and many of the test frogs were probably released in the wild. Though these frogs are no longer being imported for pregnancy tests, they are still used in research.

[...]

Read the full article at: io9.com



Related Articles
Frog That Gives Birth Through Mouth to be Brought Back From Extinction
Worlds Cutest Frog - Desert Rain Frog
Common pesticides ’can kill frogs within an hour’
Killer frog virus sweeps Britain wiping out hundreds of thousands of amphibians
Frogs found whose toes morph into claws


Latest News from our Front Page

The Aeon of Horus is Ending and the Elites are Nervous as their Icons are Dying
2014 04 18
I predict there is going to be a huge resurgence of interest in European indigenous spiritual traditions from Norse to Celtic/Gaelic to Slavic and so on. Millions of Europeans are going to realise that we are the victims of Christianity and New Age garbage. Their bastardised Kabbalah, the psychic force used by Crowley and the elites to cement his Aeon ...
Easter - Christian or Pagan?
2014 04 18
From: truthbeknown.com Contrary to popular belief, Easter does not represent the "historical" crucifixion and resurrection of Jesus Christ. In reality, the gospel tale reflects the annual "crossification" of the sun through the vernal equinox (Spring), at which time the sun is "resurrected," as the day begins to become longer than the night. Rather than being a "Christian" holiday, Easter celebrations date back ...
Man-Made Blood Might Be Used in Transfusions by 2016
2014 04 18
Researchers in the U.K. have created the first man-made red blood cells of high enough quality to be introduced into the human body The premise of the HBO show and book series True Blood revolves around a technological breakthrough: scientists figure out how to synthesize artificial human blood, which, as an ample new source of non-human food, allows vampires to "come ...
The Trials of the Cherokee Were Reflected In Their Skulls
2014 04 18
Researchers from North Carolina State University and the University of Tennessee have found that environmental stressors – from the Trail of Tears to the Civil War – led to significant changes in the shape of skulls in the eastern and western bands of the Cherokee people. The findings highlight the role of environmental factors in shaping our physical characteristics. ...
Our Fears May Be Shaped by Ancestral Trauma
2014 04 18
Last December, an unsettling Nature Neuroscience study found that mice who were taught to associate the smell of cherry blossoms with pain produced offspring who feared the smell of cherry blossoms, even if they had never been exposed to it before. We knew that the process was epigenetic—that it was not hard-wired in the permanent genetic structure of the mouse—but ...
More News »