Bacteria from the natural environment show a variety of additional shapes, including long filaments, gliding strands, chains, and all degrees of twists. See how many different body forms you can find in your stinking brew culture. Until recently, cyanobacteria were called blue-green algae. Bacteria as Parasites Opportunities for getting the nutrients and high-energy compounds needed to support bacterial reproduction are abound in the bodies of plants and animals. It's not surprising that certain bacteria have moved in and developed the adaptations for dispersal from human to human.
Spores allow a time outside, awaiting the next host.
Coughing and diarrhea are conditions induced by the parasite that encourage its dispersal. Some pathogens, such as the spirochetes that cause syphilis, are transmitted sexually, never being required to leave a human body. It may surprise you that a number of the key organelles that make up our cells originated as symbiotic bacteria that formed long-lasting partnerships with our cellular ancestors. The endosymbiotic theory of cellular evolution has become a foundation principle of modern biology. Bacteria outweigh all other organisms lumped together.