WASHINGTON — With public health officials warning of a fast-spreading emergency, House and Senate negotiators will work to reconcile legislation aimed at providing up to $1.1 billion to combat the Zika virus and the mosquitoes that carry it, Senator Mitch McConnell said on Wednesday.

The Senate last month approved $1.1 billion — far less than the $1.9 billion sought by the Obama administration — in a regular appropriations measure, after four months of sparring with the White House.

The House, in turn, approved $622 million in a stand-alone measure that requires all of the money to be reallocated from existing programs, including efforts to fight Ebola.