Even more alarming, resistant bacteria are breaking out to infect healthy people outside the hospital ward.
Antibiotic-resistant bacteria infect 100, 000 patients a year, and they are notoriously hard to fight.
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"There are very, very few players in the world that infect a dressing room, " said Bracewell.
Animals kept in close confinement, reared at close quarters, will inevitably infect one another very quickly.
These drive-by download attacks can infect personal and business computers alike with all types of malware.
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Rieger points to signs that Stuxnet was engineered to infect systems as early as January 2009.
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What is more, they think it is unlikely that the virus could actually infect people.
The problems, and the confusion they caused, threatened to infect the rest of the banking system.
Later, their progeny will head back into the mosquito's salivary glands and infect its next victim.
If the anthrax bacteria infect the lungs, antibiotics may work only if given shortly before symptoms appear.
The strain is normally found in birds, and until last month was never known to infect people.
Unless immunisation is re-started promptly it will allow the virus time to spread and infect more children.
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HIV-positive, a man is twice as likely to infect a woman as a woman is a man.
The cells did not contain a strain of PERVs known to be able to infect human cells.
Inhaling infected fluids in aerosol form - for example those produced during livestock birthing, can also infect.
But this is not possible with diseases that might be used as weapons but otherwise never infect anyone.
During the incubation period of seven to 17 days, you look and feel healthy and can't infect others.
We know it only takes a single infected computer to potentially infect thousands and perhaps millions of others.
And in fact, its malware warning is telling the truth: the site is trying to infect your computer.
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Bad guys also have the ability to infect clouds with spyware, botnets and other malicious programs, Reavis said.
One of the parasites, Toxoplasma gondii, can infect people, though it's most often found in cat feces.
The two new antibodies target one of the proteins that form a spike used by HIV to infect cells.
It used the same technique as Stuxnet, an earlier highly sophisticated malware, to seek out other machines to infect.
So far, the attackers relied entirely on social engineering to infect the targets.
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Security firm F-Secure has experimented with different ways the exploit could infect users through email and text messages.
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They identified a previously unrecorded species of Candidatus, a group of disease-causing bacteria that infect many sorts of plant.
When they infect, norovirus and flu replicate at an incredible rate - producing billions of new viruses every day.
Toxoplasma can also infect the human brain, making men distrustful of others and less likely to heed moral rules.
Merck's adenovirus and Aventis' canarypox seem to infect different kinds of immune cells.
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