* A virulent superbug carries a gene that makes it resistant to antibiotics.
* Scientists say there is an urgent need to monitor and control the bug.
* So far the bug has appeared in people living in three U.S. states.
The New Delhi metallo-lactamase-1 (NDM-1) gene makes a superbug resistant to all known antibiotics.
A new superbug from India thought to be resistant to nearly every known antibiotic poses a global threat and has spread so far to three U.S. states. Scientists urged health authorities to track the bacteria.
U.S. cases have appeared so far this year in people from California, Massachusetts and Illinois, Brandi Limbago, a lab chief at the Centers for Disease Control and Prevention, told the Associated Press.
"There is an urgent need, first, to put in place an international surveillance system over the coming months and, second, to test all the patients admitted to any given health system" in as many countries as possible, said Patrice Nordmann of France's Bicetre Hospital.
"For the moment, we don't know how fast this phenomenon is spreading... it could take months or years, but what is certain is that is will spread," he said, noting that measures have already been agreed in France and are under discussion in Japan, Singapore and China.
"It's a bit like a time bomb."
The so-called "superbug," dubbed NDM-1 (New Delhi metallo-beta-lactamase 1), and its variants appear to have originated in India and were first detected in Britain in 2007. Cases have since been reported in the United States, Canada, Belgium, Netherlands, Austria, France, Germany, Kenya, Australia, Hong Kong and Japan.
The NDM-1 is a gene that produces an enzyme that deactivate basically all antibiotics.
After the bug was detected, the number of infected people began to increase, reaching more than 70 in Britain and more than 170 in India and Pakistan.
The bug attracted media attention after the August publication of a research article in Britain's Lancet journal that said an Indian "medical tourist" appeared to have brought the bacteria to Britain.
A Belgian citizen hospitalized in Pakistan after a car accident was the first known death related to infection by the superbug.
Unlike other multi-drug resistant bugs reported during the last 20 years, NDM "brings several additional factors of deep concern for public health," said Nordmann.
For example, scientists have determined that the NDM gene "is very mobile, hopping from one bacteria to another," he said.
Specialists can help "stem the onslaught of DNM producers" through "early identification of the very first cases of NDM-related infections and preventing their spread by implementing screening, hygiene measures and isolation of carriers," Nordmann said.
Timothy Walsh with Cardiff University in Britain, who first uncovered the gene and wrote the Lancet report, worried that experts did not know how wide the bug had spread in India.
"One of the great concerns is the lack of sanitation -- more than 600 million people in India don't have sanitation -- and also because of the massive antibiotic use in those countries that can fuel the antibiotic resistance," Walsh said.
Drug resistance in bacteria, blamed on excessive and improper use of antibiotics, is not new, and health experts warn of an increasingly dangerous environment where the problem can flourish.
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