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Over 330 agents are used in the field of Infectious Disease, sold under more than 29,300 trade names worldwide. Drugs used against bacteria, parasites, and fungi take advantage of the biological nature of these organisms and disrupt their ability to grow and multiply, or utilize oxygen, sugars, proteins, and other nutrients. Viruses, however, do none of these things – instead invading our cells and converting them into “factories” that produce yet more viruses. Thus, most drugs used against viral disease interfere with various stages of cell invasion or the interaction of viral DNA/RNA with the host cell.