The reader can consult reference [6] for a critique of other attempts at modeling virus spread, a brief review of mathematical epidemiology, and a more extensive list of references than is provided here.

infection 

Or possibly dies of it, in the case of a biological host.

conclusions 

These conclusions hold when individuals become susceptible immediately after they are cured of the disease.

obtained 

For a detailed critique of other attempts to gather statistics on virus prevalence, see references [4] and [5].

appreciably 

Recall from Section 2 that viruses which are above the threshold can still die out if they fail to get a good start in life.

Madness 

A particularly virulent form of March Madness, transmitted via casual exposure to newspapers or the evening news. Typical symptoms include hysteria, acute panic, and last-minute purchases of anti-virus software.

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