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There isn't really a "purpose" for harmful bacteria, or anything else, in the scientific sense (perhaps what you really meant to ask was "Why did God/the gods create harmful bacteria?" but then you should have put it in the Religion category).
Some bacteria are "harmful" because that helps them spread and reproduce (bacteria that happened to cause coughing or sneezing spread more effectively, and so passed that trait on to their descendants). Some bacteria are harmful as a defense against other kinds of bacteria; a species that can live in a highly toxic environment has at least some incentive to MAKE the environment highly toxic so that they don't have to compete with other species. And some bacteria are harmful more or less "by accident"; they don't derive any real benefit from being harmful, but there's no advantage to them in NOT being harmful either, so there's no evolutionary pressure on them to become either more or less harmful.
What else can I help you with?
Bacteria greatly out number harmful bacteria?
Yes. Most bacteria is not harmful to us such as bacteria in a yogurt, but some bacteria is harmful.
How much percent of bacteria are harmful?
Only 1% of bacteria is harmful to humans
What are some harmful and helpful bacteria?
Harmful bacteria will harm you. Helpful bacteria will help you.
Where is harmful bacteria live?
the harmful bacteria live in air,human body etc.
What harmful thing does bacteria do?
Bacteria can make you get a harmful diseese, and you could dye. ( I think )
Are botulism bacteria helpful or harmful?
harmful
What organisms are bacteria harmful to?
There are harmful to all organisms, but some bacteria are helpful in many ways.
What kinds of bacteria are harmful?
Some common harmful bacteria include Escherichia coli (E. coli), Salmonella, Streptococcus pyogenes, and Staphylococcus aureus. These bacteria can cause various infections and illnesses in humans.
What is a bacteria that is both harmful and helpful?
a bacillus bacteria
Why is bacteria in storm water harmful?
Bacteria in storm water can definitely be considered harmful. This is because this bacteria is hard to kill and foreign to your body.
Is bactria harmful or helpful?
Bacteria can be both harmful and helpful. Harmful bacteria can cause diseases in humans, animals, and plants. However, some bacteria are beneficial and play important roles in processes like digestion, nutrient cycling, and decomposition.
Are microbes harmful?
All Microbes are not harmful. All virus are harmful. Some bacteria are harmful
