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How can a non pathogenic be a pathogenic?

In: Infectious Diseases, Biology, Microbiology, Immune System [Edit categories]

Relevant answers:

Are bacteria pathogenic or non pathogenic?
Both. Some bacterias may be pathogenic while others are quite harmless, and sometimes even useful to its host.
Can Non pathogenic bacteria change to pathogenic?
yes
Is the bacteria MRSA pathogenic or non pathogenic?
MRSA bacteria are pathogenic, this is the name given to a group of bacteria that belong to the Staphylococcus aureus family of bacteria which have grown resistant to methicillin-type antibiotics....
List of non pathogenic and pathogenic microorganisms?
Phathogenic microoganisma are: Clostridium botulinum Staphylococcus Streptococcus Erysipelas cocci
Are measles pathogenic or non-pathogenic?
Measles are infact pathogenic. As it is an infectious disease and the pathogens are infectious viruses and the leucocytes/leukocytes and phagocytes (white blood cells) can't cope with them.