The unit of measurement for most bacterial cells is micrometers and most viruses are nanometers.
Bacteria are microscopic single-celled organisms that exist in millions in every environment inside and outside other organisms. Some bacteria are harmful, but most serve a useful purpose. They support many life forms, both plants, and animals, and are used in industrial and medical processes.
Bacterial diseases are diseases caused by bacterial infections. Most bacteria are harmless or beneficial to the body, but disease-causing bacteria can cause a variety of health problems. This article briefly discusses bacteria and bacterial diseases, their symptoms, how they spread, and more. Common symptoms of bacterial infection include fever, chills, fatigue, and headache. Signs and symptoms of bacterial infection usually depend on
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