..., antibodies neutralize viral particles circulating in the blood but they are not capable of freeing the organism from infection, since virions multiply inside the cells (Mizel and Jaret, 1985; Roitt et al., 1985). Let us now consider HIV infection. Like most viruses, HIV must rely on a host...

... as getting computer viruses, if sites are interpreted as human beings, then “infection” can be also interpreted as spreading a rumour. Two extreme cases are of particular interest, one is the case that if a site gets its information from an infected sender then it is simply infected, another case...