Glowing insect bug 'harms humans'

 Insects and human immune systems are similar


A new disease has been identified caused by a luminous bug that has evolved in 
insects, scientists say. 

Source:

http://news.bbc.co.uk/2/hi/health/3951889.stm

There have been about a dozen cases of the bug - Photorhabdus asymbiotica - in the US 
and Australia, which causes pustulant sores to appear on the body. 
In insects, the disease leaves the bodies glowing, the University of Bath and London 
School of Hygiene and Tropical Medicine scientists said. 
They are now warning more insect bugs may mutate to threaten humans. 

The team believe the sores caused Photorhabdus asymbiotica may also glow but this has 
not been proved so far as victims have been treated before tests could be done. 
 Insects are numerous and reside in close proximity to man, yet they have been 
generally ignored as a potential source of microbes that could be harmful for man 


Dr Nick Waterfield, of the University of Bath 


The scientists have also said it could be more common than has been reported as it may 
have been diagnosed as something else. 
The findings, revealed in the latest edition of the Nature Reviews Microbiology 
website, are part of a wider research project looking at the emergence of diseases. 
While the infection can be easily treated and is not considered dangerous, the team 
said bacteria in insects could soon mutate to throw up potentially deadly diseases. 
DNA studies have suggested the bubonic plague, which killed millions of people in the 
14th and 17th centuries, emerged from insects as does anthrax. 
Malaria, a disease closely associated with insects, is only carried by mosquitos, it 
is not an insect-based disease as the plague was thought to be. 
Similarities between human and insect immune systems mean that many of the bacteria 
that causes insect diseases have a head start in mutating to attack humans. 
Dr Nick Waterfield, from the University of Bath, said: "Most scientists are looking at 
diseases of farm animals as the biggest threat to humans. 
"Insects are numerous and reside in close proximity to man, yet they have been 
generally ignored as a potential source of microbes that could be harmful for man. 
"As well as passing microbes directly into our bloodstream when they bite us, insects 
can also act as a reservoir to `cook up' future human diseases. 
"Understanding the mechanism that the bacteria use to change their disease-causing 
ability is important if we are to successfully treat emerging infectious diseases 
before they get out of control and become epidemics." 
He also said the situation was being complicated by climate change, which has meant 
insects can survive and breed in more places. 


 



                
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