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Vaccines prevent between 2.5 and 4 million deaths every year.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.