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A lot of viruses. a tick bite can transmit viruses such as a form of encephalitis called tb e v in humans the pathogen can cause a fatal inflammation of the brain. other viral diseases are airborne so there are lots of ways they can spread. thats clever viruses which consist of just d.n.a. or r.n.a. in a protective envelope they dont have their own metabolism so they need a host like humans or other organisms in order to reproduce in the case of an infection a virus hijacks the host cell and inj...