Word: viral
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Shellfish are also highly susceptible to bacterial and viral contamination, since they live close to the shore, where pollution tends to be worst. Cooking generally destroys the microbes that infect shellfish, but eating raw clams, ^ oysters and other shellfish is linked to nearly 1,000 cases of hepatitis each year...
Acute attacks of asthma occur when the bronchial tubes of the lungs become partly blocked. For reasons that are not entirely clear, the lungs are overstimulated by viral infections, allergens or pollutants. The body responds by activating various defense cells from the immune system. Their mobilization causes the airways to swell. At the same time, the muscles surrounding the airways contract, cutting off airflow. When that happens, asthmatics must inhale an adrenaline-like substance to stop the muscle spasm and reopen their airways...
Harvard researchers at the Dana-Farber Cancer Institute have found evidence of a viral basis for brain tumors, according to a recent study published in the New England Journal of Medicine...
Evidence Found for viral Basis of Tumors...
...think people are very skeptical about viral links to cancer," he said. "It's a controversial area...