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Microorganism capable of injuring its host by competing with it for metabolic resources, secreting toxins or destroying its cells or tissues. The injurious microorganisms include viruses, bacteria, mycobacteria, fungi, protozoa. Pathogenic microorganisms may be carried from one host to another. Some organisms are pathogenic for animals as well as humans and may be communicated to humans through direct or indirect contact. Pathogenic microorganisms such as rhinoviruses, mycobacteria, or varicella may be discharged into the air, from which infection may be caused to exposed persons.