@dr_brace: Cold viruses enter the nose through inhaled droplets and immediately begin searching for cells they can infect. The surface of each viral particle carries proteins shaped to match certain receptors on nasal cells. These receptors sit on the outer membrane of the tissue lining the nasal passages. When the viral protein meets its matching receptor, the two fit together like a lock and key. This contact allows the virus to anchor firmly to the cell. Once attached, the virus uses the receptor to enter the cell. It triggers structural changes that pull the virus inward. Inside the cytoplasm, the virus releases its genetic material. This genetic material takes over the cell’s machinery and directs it to produce more viral particles. As copies accumulate, the infected cell becomes damaged and sends signals that activate inflammation. The lining of the nose reacts to this injury through increased mucus production and swelling. The swelling narrows air passages and makes the tissue sensitive. More cells become infected as newly formed viruses spread to neighboring surfaces. This step by step attachment and entry process explains why cold viruses spread quickly through nasal tissue.#foryou #foryoupage #usa #facts

Dr. Brace

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Sunday 08 February 2026 12:03:09 GMT