These are Cocci, they are spherical in shape. Cocci cause many bacterial infections in humans, such as strep throat, pneumonia, food poisoning, otitis media, various skin diseases, meningitis and severe types of septic shock.
These are bacillus, they are cylindrical in shape. Some are pathogens and cause diseases such as but others are beneficial and used to make yoghourt and other products.
Numerous enzymes, antibiotics and other metabolites have medical, agricultural, pharmaceutical and other industrial applications. Examples of antibiotics formed by Bacillus spp include bacitracin.
They form spores which are a method of surviving unfavourable conditions.
Spirilla are spiral shaped as you can see, they cause diseases like siphilis .
Finally vibrios are comma shaped bacteria, some of them, for example Vibrio vulnificus can cause serious illness when you eat seafood.
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