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dry eyes resulting from disorders of the eyelid or diminished ability to form tears.foreign objects that injure or become lodged in the eye.sensitivity or allergic reactions to eye makeup, dust, pollen, pollution, or other irritants.vitamin A defi...
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A virus is an infectious agent, often highly host-specific, consisting of genetic material surrounded by a protein coat.Viruses infect virtually every life form, including humans, animals, plants, fungi, and bacteria. So small that they cannot be ...
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Viruses are familiar from the common diseases they cause: colds and flu, for instance. But what are they, and how do they cause sickness?
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Bacteria are prokaryotes(unicellular organisms with no membrane-enclosed nucleus) with simple structures that typically range in size from about 0.5 to 20 micrometers.Bacteria are named according to the binomial(two-name) system of nomenclature fi...
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The bacterium Heliobacter pylori is the only one that can survive inside the human stomach. It causes gastritis and ulcers, but is generally treatable with a combination of antibiotics.
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