it's possibly a case of you not quite understanding how the 3-5% 'death rate' is calculated.
Essentially, of those 460 people, as well as the 8 people who have already died, an additional number of those ill, but currently still alive will also die, so they are factored into the death rate in advance.
To visualise what these numbers actually mean...
Assume a full Edgeley Park (11600ish) The death rate in Italy is 6.6% (765) that means that virtually everyone in the Railway End dies.