In the context of zombies this means; because of the uncertainty associated with how zombies are created, and exactly how the zombie infection might be spread, and since we assume the level of effect would be catastrophic, we should take at least minimum measures to prepare.  We cannot possibly prepare for every contingency. However, we can prepare ourselves for a number of scenarios based on the prioritized risk associated with high level factors such as infectiousness, vectoring, expected physical abilities, perceived mental capacity, geographic population density, etc.  Typically in a risk assessment the factors used to characterize the risk are identified, and prioritized.  Those factors found to be high priority are devoted the majority of the resources. 

Zombies are thought to carry and transmit a highly infectious but yet to be identified pathogen.  Please note: the Solanum virus is a fictional virus created by Max Brooks for purposes of entertainment.  Since there are no formal qualifications for the title “Zombie Expert”, we end up with a considerable amount of useless and misleading information from them.  Zombie infection could potentially be caused by any type of pathogen (i.e. viruses, bacteria, prions, etc.).  By knowing general exposure routes for these types of pathogens, we can take measures to reduce our exposure to them.  For example viruses and bacteria are typically transmitted through direct contact with; bodily fluids, contaminated surfaces, and infected tissues.  Prions are primarily transmitted through consumption of infected bodily fluids and tissues. 

Considering the general routes of exposure for the suspected types of pathogens, we can identify the potential transmission routes of the zombie pathogen and mitigate for them.  Consider wearing safety equipment which will reduce your exposure via the primary routes.  Put together a Zombie Go-Kit, and prepare your home and car.  It's time to Get Prepared.