What is pneumonia? Pneumonia is an infection of the lungs caused by micro-organisms such as viruses, bacteria, or fungus. Most cases of pneumonia start when infectious particles, breathed in through the nose and mouth, travel down the airways into the lungs. Pneumonia can affect one or both lungs at the same time. The disease can …
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A virus is an incredibly small biological agent capable of infecting animals, plants, bacteria, and fungi. The typical virus is approximately 1/10 the size of a single bacteria and 1/100 to 1/1000 the size of a human cell. What are the parts of a typical virus? Although there are many different types of viruses (see …
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Viral cytopathic effects

Viral cytopathic effects are changes that take place in a cell after it has been infected by a virus. These changes can only be seen after the tissue is examined under a microscope. These changes can involve the shape and size of the cell. They can also involve a part of the cell called the …
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