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Why do we fall ill, Antibiotics aren't effective against viruses?, , Antibiotics commonly work by blocking the biochemical, pathways that are important for bacteria. Thus these inhibit, the growth of bacteria, hamper the metabolism and kill them., Antibiotics do not work on viruses because viruses do not use, the biochemical path and use host cell machinery for making, proteins., , However, the most effective way to treat viral infections and, disease is vaccination as it can prevent a person from getting, the disease in the first place.