I could be wrong, but I don't think that was the same place where Otis died. As for the bodily fluid thing, the way the happened to mention that those cops weren't bit and when they focused closely on the blood that Shane twice wiped on the bus, I'm wondering if maybe Shane did get injected and it just takes much longer for the Walker virus to take effect. Perhaps? Who knows aside from the writers...
I don't want my thoughts to die with me, I want to have done something... I still want my life to have meaning. ~ Temple Grandin