[Vince Ferrer]

In an earlier episode it was revealed they all already have the zombie virus, it just kicks in when they die. So, the zombie “ooze” on the arrow wouldn't give you the virus.

Can they have normal children?

[MacMattico]

I don’t know if that was ever determined. But the guy at the CDC said they all had it (before the baby was born) so it must be in the air or something.

[tbw2]

Lori did. Judith was even conceived after the zombie virus was spreading.