I agree that the story will go in that direction, Heshel thinks they are still curable, thats why he keeping them, but I find that really hard to swallow.
The man is a veterinarian , even if all he has ever done is work on farm animals, he has to understand the basics of mammalian physiology. A mammal cannot survive more then a few days without consumming water. He has to know the Zombies aren't drinking water, so he should to know there is no hope.
And then there was his speech about comparing it to AIDS, he had a good point, afterall, remember when the government totally collapsed for serveral months due to AIDS and all near by major cities fell to the infected ; then , just like Heshel said, we found a cure and everything went back to normal?
Oh wait, that's not what happend... it's almost like a sane person would have a hard time drawing a paralell between AIDS and the Zombie Virus.
Cheers,
Kytee