Answer-
B they can cause disease in normal, healthy individuals.
C examples of primary pathogen include both bacteria and virus.
Option b and c are true.
Primary pathogens are microorganisms that cause disease in any condition of the host , be it healthy or immunocompromised , irrespective of health status of an individual . These microorganisms cause disease by themselves . The primary oathogen can be a bacteria , virus , fungi or protozoa . The disease can be acute or chronic such as tuberculosis , leprosy , plague etc
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