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The gas is known as the silent killer because it cannot be seen or smelt.
BBC: Carbon monoxide detector
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Known as the silent killer, ovarian cancer is the fifth leading cause of cancer death among women, killing 14, 600 annually.
FORBES: Leadership
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Whether it's a deliberate attack, as with anthrax, or the outbreak of a slow and silent killer such as HIV, the Centers for Disease Control and Prevention is in the forefront of America's defense.
CNN: Recovery: Victims identified through DNA
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Sedentary living is the most prevalent disease, biggest silent killer and greatest health threat facing developed countries.
BBC: Laziness will send us to an early grave
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"A silent killer" - those are the words David Bull uses to describe his long-standing liver complaint.
BBC: Liver damage is 'silent killer' cirrhosis patient warns
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"The thing about carbon monoxide poisoning is that the carbon monoxide itself is odourless, colourless, tasteless so it's a silent killer, " he said.
BBC: Neil McFerran (l) and Aaron Davidson (r)