Democrats want direct funding for plan parenthood in the bill to help deal with Zika. Republicans don't want this, but would allow for states to allocate money as needed (including plan parenthood).
Democrats want this bill considered to be emergency funding, but Republicans have paid for part of the 1.1 billion dollar bill with 750 million from ~100 million of unused funds from Ebola and ~540 million from unused funds from the affordable health care act. The funds for the affordable health care act were unused because in some US territories it was not feasible to setup exchanges and they opted for additional medicare funding and so did not need the money to setup the exchanges.
So nothing really poisonous going on, just disagreement.