- A self-limiting, acute viral infection of the upper respiratory tract. The resulting inflammation involves the nasal passages, throat, sinuses, trachea, and bronchi.
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- A chronic degenerative disease of the liver characterized by destruction of the hepatic parenchymal cells, which are replaced by regenerative nodules surrounded by fibrotic tissue.
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Chronic Obstructive Pulmonary Disease (See also Asthma, Bronchitis, Bronchiectasis, and Emphysema)

- An umbrella term encompassing a cluster of diseases in which recurrent obstruction of airflow is a prominent feature.
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Chronic Fatigue Syndrome (Immune Dysfunction Syndrome)

- A poorly understood illness characterized by pervasive, chronic, and incapacitating fatigue.
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- Acute or chronic inflammation of the gallbladder (cholecystitis) usually associated with gallstones (chole-lithiasis), which lodge in the cystic duct. Choledocholithiasis is obstruction of the common bile duct by gallstones.
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