I don't remember what actually happends when people eat infected flesh.
I have in mind :

Gareth and the cannibals eating bitten Bob's leg in [S05E03, Four Walls and a Roof](http://walkingdead.wikia.com/wiki/Four_Walls_and_a_Roof). It seems that the cannibals survive for a while after eating Bob's flesh and they seem OK.

The Saviors eating pigs that ate walkers in [S07E02, The Well](http://walkingdead.wikia.com/wiki/The_Well). We don't know for how long this process ah been on, but [Richard](http://walkingdead.wikia.com/wiki/Richard_(TV_Series)) has his routine and looks used to doing that. Can we assume that Saviors are eating infected pig flesh for a while now ?

Does it have negative effect in long term ?