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 / Updated  / Source: Associated Press

A dysfunctional Senate split along party lines on Tuesday and left a $1.1 billion proposal to fight the Zika virus in limbo, despite growing fears and a continental U.S. caseload that's exceeding 800.

Democrats blocked the GOP-drafted measure by a 52-48 vote Tuesday — short of the 60 votes required to advance it. The party faulted Republicans for packing the bill with provisions designed to deny new funding for Planned Parenthood clinics in Puerto Rico and ease rules on pesticide spraying.

New Map Finds 2 Billion People At Risk of Zika ViruseLife, Oxford University and the University of Washington

What happens next is unclear. Neither side is looking forward to leaving Washington next month for a seven-week vacation without having acted to address the health threat.

"There's not going to be another opportunity to deal with this in the near future."

Zika is spread mainly by a tropical mosquito and is causing an epidemic in Latin America and the Caribbean. The virus can cause horrible birth defects and is likely to spread further this summer. So far, there's been no transmission by mosquitoes in the continental U.S.

The more than 800 cases include almost 300 pregnant women at risk of delivering children with severe deformities.

Democrats pressed to resume negotiations while Republicans insisted, for now at least, that the measure negotiated by House and Senate Republicans is the best the Obama administration is going to get. The administration had requested $1.9 billion in emergency funds in February.

"There's not going to be another opportunity to deal with this in the near future," promised No. 2 Senate Republican John Cornyn of Texas.

The White House has threatened to veto the legislation.

The House-Senate measure matches the $1.1 billion measure that passed the Senate last month on a sweeping vote, but Democrats oppose a handful of provisions designed to mollify GOP conservatives in the House and the attachment of companion spending cuts to defray its cost.

Related: Puerto Rico Struggles to Deliver Contraceptives as Zika Spreads

Democrats particularly oppose a provision that restricts the use of $95 million worth of federal grants to provide services such as birth control to women in Puerto Rico threatened by the virus. Democrats charged that the restrictions were targeted at Planned Parenthood, a group loathed by many anti-abortion Republicans.

In addition to the limits on Planned Parenthood, the bill would temporarily lift Clean Water Act permitting requirements on pesticide spraying for municipalities and other large-scale users.

Even as Democrats pressed for compromise, they crowed that Republicans would soon reconsider.

"They come back with their tail between their legs saying 'Let's pass something,'" said Sen. Charles Schumer, D-N.Y.

Republicans controlling Congress have been slow to act on Obama's request, instead forcing the administration to redirect more than $500 million in unspent Ebola-fighting funds to combat Zika.

"I wonder what the senators who voted against this bipartisan Zika funding bill would tell the mother of this child."

Top Senate Democrats reiterated their opposition to the partisan provisions, but offered relatively mild objections to the inclusion of spending cuts to finance the Zika package.

Related: New Map Shows Where Zika Mosquitoes Lurk in U.S.

"We stand ready to work cooperatively with you," the Democrats' letter said.

The measure is an agreement between House and Senate Republicans who say they drafted it in hopes of finding a compromise that could somehow satisfy both tea party Republicans and Obama's Democratic allies in the Senate. It did nothing of the sort. The House passed the measure along party lines last week.

Minority Leader Harry Reid, D-Nev., also reacted with outrage that GOP negotiators dropped a House provision to ban the display of the Confederate flag at federal veterans' cemeteries a day or so each year. Democrats did not seek to address the issue during Senate debate last month.

Each side already has begun the blame game. Cornyn appeared on the Senate floor with a poster of a baby born with microcephaly, a severe deformity in which children are born with poorly developed brains and small skulls. Florida has been hit by its first case of microcephaly from a Haitian woman who came to Florida to give birth. Several high-profile athletes have said they'll skip the Olympics in Brazil, where Zika is widely prevalent.

Related: Florida Reports First Zika-Related Birth Defect

"I wonder what the senators who voted against this bipartisan Zika funding bill would tell the mother of this child," Cornyn said.

"What a cynical and hypocritical thing to do," Schumer said. "All Democrats have ever asked for on Zika was to give the (Centers for Disease Control and Prevention) and the other agencies to protect the American people, pregnant mothers, and their babies from this dangerous virus."