Some viruses reproduce only in bacteria.
Animals, plants and fungi are all susceptible to attack by particular viruses. Above is a computer model of an adenovirus, a type of virus that can cause colds. It then enters the cell through endocytosis. A series of steps occur to allow the virion to be releases through membrane fusion. Shown above is the replication of the retrovirus, HIV-1, but the main events are common to all viruses although the precise details vary.