The orderly didn't get infected. In fact, he died. Much like a poisonous snake Eve's saliva had become potent to the point where only a few drops were necessary in order to kill a man. It was discovered much later that an infected human when starved for too long would produce a lethal toxin in their spit specifically designed to take down prey so they could feed. It was this revelation that forced internal government organizations to reassess the overall threat of the zombie race.
It started out as a passive request. The government began a program called "Step Up" a euphemism employed to veil the exchange of zombified family members for food. Every week armed members of the military patrolled the poorest neighborhoods in the poorest towns and offered up huge bags of rice and other none perishables for every undead person that they produced. The solace that the army men were able to offer was that their loved ones were not being put to death. They were simply being gathered together for observation and "treatment" while they were contained in a number of secure, monitored locations across all fifty states.
Of course there were a few hold outs, a few families who thought that they could care for their infected brothers and sisters better. Most of them were just negotiating for more food but some of them were legitimate in their belief. It was a delicate situation because the country had yet to devolve into chaos. Some form of community, solidarity and respect had developed from the country and class wide realization that all Americans were stuck in the situation together. The government did not seek to disturb this delicate balance by mowing down a few hillbillies who did not want to surrender their husbands, wives, kids or parents.
