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Bacterial and viral infections have many things in common. Both types of infections are caused by microbes -- bacteria and viruses, respectively -- and spread by things such as: 1  Coughing and sneezing.  Contact with infected people, especially through kissing and sex.
Primary bacterial diseases are caused by invasion of bacteria that cause disease with no other predisposing factors. Secondary bacterial diseases are caused by invasion of bacteria after a predisposing condition, such as viral infections, stresses, tissue injuries, and dietary upsets.A bacterial disease may affect a single tissue or organ, or it may affect multiple tissues and organs of the animal.ungal diseases may also be called mycosis or mycotic diseases. Some fungi infect the superficial layer of skin (such as the ringworm fun-gus), and others invade various body systems (such as the aspergillus fungus). Parasites Common parasitic diseases of animals are caused by arthropods, worms, and protozoa.