Everyone talks about the zpoc being caused by a virus. And for good reason.
Viruses are sneaky little things, responsible for a lot of scary disease outbreaks like Swine flu, Ebola and Herpes. So it is important to be able to spot one, which is pretty much impossible seeing that are 20 and 300 nanometres in size.
Anyway, basically they are dead protein capsules containing DNA or RNA. They invade your cells, turn them into virus manufacturing plants and make you sick.
The best thing you can do to avoid infection? Wash your hands. Seriously, it greatly reduces the spread of the clingy little buggers. Wearing a Hazmat suit also helps.
Bite off more than you can chew.