Answer ( 1 )


    many bacterial species are harmless that do not cause infection. some bacteria are beneficial i.e. gut microflora, biocontrol etc. pathogenic bacteria are those that can cause disease i.e. mycobacterium, salmonella, e.coli etc. there are some other bacteria which are opportunistic that cause disease when they get chance i.e. body’s microflora start working against body when body get infected with some pathogens.

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