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A viral vector uses a virus's talent for getting inside cells, but with its harmful genetic instructions removed. Scientists replace them with therapeutic instructions, turning a cell-invading virus into a delivery vehicle.
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A person can feel fine because an infection has not caused obvious symptoms, not because it is necessarily gone. If the pathogen can still be passed on, an…
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A bat bite may not look like much: tiny, sharp teeth can leave a mark someone barely notices. But the wound’s size does not tell you whether rabies was…
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Cold air can change the nose's defenses against viruses. Researchers studying human nasal cells and tissue found that cooler conditions weakened an antiviral…
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Rabies can travel along nerves toward the brain, and symptoms such as headache or hydrophobia appear after the nervous system is involved. At that stage, the…
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An infected person can shed billions of viral particles, while only a few are needed to cause illness. Contaminated hands, food, and surfaces can therefore…
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Polio spreads from person to person, often when traces of infected stool reach someone else's mouth. In summer, pools and crowded camps put many people…
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