Navigation Links
El Ni?o cycles linked to cholera outbreaks ,,

About 11 months after the start of an El Ni?o event in the equatorial Pacific, hospitals thousands of miles away in Bangladesh can expect a surge of cholera cases, according to the first mathematical model to link climatic cycles with subsequent cholera outbreaks.

Details of the climate-disease model are reported in the latest issue of the journal Science by ecologists at Cornell University and the universities of Barcelona, Maryland and London. Cholera is caused by the pathogenic microorganism Vibrio cholerae , a bacterium that lives among zooplankton in brackish waters and in estuaries where rivers meet the sea, and infects humans through contaminated water.

Researchers previously had proposed a link between cholera outbreaks and distant El Ni?o Southern Oscillation (ENSO) events that were mediated by increased sea-surface temperatures and higher numbers of bacteria-bearing zooplankton. But it took a complex model that could account for all contributing factors while discounting insignificant correlations --as well as month-by-month records of cholera cases -- to prove the link. Data on cholera incidence, which normally can rise and fall twice each year with local influences such as monsoons and seasonal temperature changes, came from a hospital in Bangladesh that had tested all incoming patients for cholera for 18 years, from January 1980 to March 1998. The Ellner model took into consideration recent frequencies of cholera cases, an ENSO index based on sea-surface temperatures in the Pacific and seasonal variation in local climates. Peaks in cholera incidence at the Bangladesh hospital were found to occur every 3.7 years -- exactly the same frequency as of ENSO events between 1980 and 1998. But the cholera outbreaks and ENSO events did not precisely coincide: The scientists found an 11-month time lag from the start of an ENSO event near the equator and a peak in cholera incidence. A separate analysis o f climate variables including humidity in the troposphere layer of the Earth's atmosphere, cloud cover and the amount of absorbed solar radiation -- suggested that the 11-month lag results from a six-month lag between an ENSO and increases in sea-surface temperatures off the coast of Bangladesh, plus a five-month lag between increased sea-surface temperatures and a peak in cholera. These results indicate that the dynamics of cholera in Bangladesh are consistent with a remote forcing by ENSO. The climate-disease story might be even more complicated and needs further research. In the case of Bangladesh, "another mediating factor in the ENSO-cholera relation might be the melting of the snowpack in the Himalayas and its effect on monsoons, precipitation and river discharge. Floods and drought can affect not only human interactions with water resources and therefore exposure to the pathogen, but also sanitary conditions and disease susceptibility.

The discovery of a remote link between El Ni?o events and cholera outbreaks comes at a time when some ecologists, are predicting major increases in disease and death as global climate change provides ideal conditions for disease-causing organisms. Yet, the El Ni?o -cholera model should not be used to predict cholera outbreaks far into the future until climatologists learn more about the frequency of ENSOs over the long term.
'"/>




Related medicine news :

1. Regular exercise linked to extended menstrual cycles
2. Sleep cycles may be related to metabolism
3. Motorcycles Cause Greater Pollution
4. Cancers of Colon & Rectum linked to Cigarette Smoking
5. Gene linked to early puberty in girls
6. Maternal alcohol consumption linked to behavioral problems in children
7. Gene HPA-2 Met linked to cardiac arrest
8. Early puberty linked to nutrition
9. Alcohol linked to brain activity
10. Cement injections linked to osteoporosis
11. Asthma linked to obesity
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/29/2016)... Ferry, New York (PRWEB) , ... April 30, 2016 , ... ... the Dobbs Ferry campus. The following programs will be expanding due to high ... Management (HRM). The expansion will begin this summer. , School of ...
(Date:4/29/2016)... MA (PRWEB) , ... April 29, 2016 , ... ... the Two Ten Footwear Foundation, the national charitable foundation serving the footwear industry, ... With 8,000 volunteers representing more than 130 companies across 23 states during the ...
(Date:4/29/2016)... , ... April 29, 2016 , ... ... Spiritual Awakening , announces the addition Onnit brand Alpha BRAIN and New Mood ... of Onnit brain and mood optimization products to the store is just one ...
(Date:4/29/2016)... Georgia (PRWEB) , ... April 29, 2016 , ... On ... rural hospitals across the Southeast, celebrated the signature of Gov. Nathan Deal on SB ... Rep. Geoff Duncan (R - Cumming), offers a 70% tax credit to individuals and ...
(Date:4/29/2016)... CA (PRWEB) , ... April 29, 2016 , ... ... advocating optimistic healthcare awareness and author of best seller "LOVE, MEDICINE and MIRACLES") ... Radio Monday, May 2, 2016 and podcasted thereafter . Dr. Bernie Siegel, ...
Breaking Medicine News(10 mins):
(Date:4/29/2016)... , April 29, 2016 ... glyco-biology expertise, today announces the appointment of Dr. ... Dr. Zurlo is an oncologist with many years clinical ... and biotechnology industries. His last role was at Mologen ... of the Executive Board. Previously Dr. Zurlo held various ...
(Date:4/28/2016)... YORK , April 28, 2016  While ... notably complement the company,s valve repair and stent ... move also places Abbott more firmly into patient ... of the fastest growing device areas, with double-digit ... its recent report,  Advanced Remote Patient Monitoring ...
(Date:4/28/2016)... Dr. ... und Stephen Schmidt werden Teil ... ein führender Anbieter cloudbasierter Softwarelösungen für den ... neue Führungskräfte zum Team Sicherheit und Pharmakovigilanz ... Erfahrungen mitbringen.  Dies wird die Geschäftseinheit Sicherheit ...
Breaking Medicine Technology: