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NEW YORK (AP) -- U.S. health officials are investigating more than a dozen possible Zika infections that may have been spread through sex.
The 14 cases all involve men who visited areas with Zika outbreaks, and who may have infected their female sex partners, who had not traveled to those areas.
Zika virus is mainly spread by mosquito bites, and sexual transmission has been considered rare. There have been two reported cases, including a recent one in Texas, and at least two other reports of the Zika virus found in semen.
Mosquito-borne Zika outbreaks have erupted across most of Latin America and the Caribbean in the last year. So far, all the 82 Zika infections diagnosed in the U.S. have involved people who traveled to outbreak regions.
On Tuesday, the Centers for Disease Control and Prevention said the 14 possible cases of sexual transmission in the U.S. include two women whose infections have been confirmed. Tests have not been completed for their male partners.
In four other cases, preliminary tests indicate women were infected but confirmatory tests are pending. Eight other cases are still being investigated, according to a CDC statement.
Several of the 14 are pregnant, but the CDC refused to be more specific.
The agency said there's no evidence that women can spread the virus to their sex partners, but more research is needed.
In most people, Zika causes mild or no symptoms - fever, joint pain, rash and red eyes - that last about a week. But in Brazil, health officials are investigating a possible connection between the virus and babies born with brain defects and abnormally small heads.
The link hasn't been confirmed but the possibility has prompted health officials to take cautionary steps to protect fetuses from the virus.
Research is also underway into a possible link between Zika infection and a paralyzing condition in adults called Guillain-Barre syndrome.
The CDC is advising men who have recently been to a Zika outbreak area to use a condom when they have sex with a pregnant women, or to abstain from sex during the pregnancy. It also has recommended that pregnant women postpone trips to more than 30 destinations with outbreaks. The CDC on Tuesday expanded its Zika travel advisory to two more places - the Marshall Islands, and Trinidad and Tobago.
There is no vaccine for Zika. Researchers are scrambling to develop one, as well as better diagnostic tests.
The Zika virus is mostly spread by the same kind of mosquito that transmits other tropical diseases, including dengue and chikungunya. That same mosquito is found in the Southern U.S. and officials expect they will eventually spread the virus, too. But they don't expect to see major outbreaks.
The CDC recommends that all travelers use insect repellent while in Zika outbreak areas, and continue to use it for three weeks after travel in case they might be infected but not sick. That's to prevent mosquitoes from biting them and possibly spreading Zika to others in the U.S.
SYRACUSE, N.Y. (AP) -- A New York man has pleaded not guilty to murder charges in the slaying of his toddler daughter, whose body was found in a creek days after he disappeared with her.
The Post-Standard of Syracuse reports (bit.ly/1QcQIZ4) that 24-year-old Ryan Lawrence was in jail-issued clothes and shackled during Wednesday's arraignment in city court. He is being held without bail in Onondaga County Jail.
Lawrence was charged with second-degree murder Tuesday after divers found 21-month-old Maddox Lawrence's body in a creek near Syracuse's inner harbor.
Police say they don't have a motive for the slaying.
Authorities issued an Amber Alert for Maddox on Sunday after Lawrence disappeared with the girl.
Prosecutors say she was likely killed outside Syracuse before Lawrence dumped her body in the creek.
LAS VEGAS (AP) — Notching three in a row, Donald Trump decisively won Nevada's Republican caucuses Tuesday as Marco Rubio bid to elbow out Ted Cruz for second place in an increasingly urgent effort to slam the brakes on the Trump juggernaut.
Trump now can claim victories in the West, the South and Northeast — a testament to his broad appeal among the mad-as-hell voters making their voices heard in the 2016 presidential race. His rivals are running out of time to stop him.
"We're winning, winning, winning the country," Trump declared. "Soon, the country is going to start winning, winning, winning."
Ticking off a list of upcoming primary states where he's leading in preference polls, Trump predicted he'll soon be able to claim the GOP nomination. "It's going to be an amazing two months," he told a raucous crowd at a Las Vegas casino. "We might not even need the two months, folks, to be honest."
Entrance polls captured the sentiment propelling Trump's insurgent campaign: Six in 10 caucus goers said they were angry with the way the government is working, and Trump got about half of them.
With time running out, Nevada was a critical test for Rubio and Cruz, the two senators battling to emerge as the clear alternative to the GOP front-runner. Rubio was out to prove he can build on recent momentum, while Cruz was looking for a spark to help him recover from a particularly rocky stretch in his campaign.
Lagging far behind the two senators in the Nevada vote were Ohio Gov. John Kasich and retired neurosurgeon Ben Carson.
Rubio, already campaigning in Michigan as caucus results rolled in, sought to project confidence that he can consolidate the non-Trump voters who have been splintering among an assortment of GOP candidates, saying "we have incredible room to grow."
But after finishing third in Iowa, fifth in New Hampshire and second in South Carolina, Rubio needs a win soon to support the idea he can beat Trump.
Cruz, a fiery conservative popular among voters on the GOP's right, finished a disappointing third in South Carolina after spending much of the past two weeks denying charges of dishonest campaign tactics and defending his integrity. Another disappointing finish in Nevada would raise new questions about his viability heading into a crucial batch of Super Tuesday states on March 1.
In a more muted address across town, Cruz gave Trump his due for winning in Nevada and then pressed the argument that he's the only candidate who can stop the billionaire businessman.
Harking back to own win in Iowa's leadoff caucuses, Cruz told supporters "the only campaign that has defeated Donald Trump is this campaign."
Then, looking for opportunities that lie ahead in his home state of Texas and elsewhere, he added: "One week from today will be the most important night of this campaign: Super Tuesday."
The election calendar suggests that if Trump's rivals don't slow him by mid-March, they may not ever. Trump swept all of South Carolina's 50 delegates, giving him a total of 67 compared to Cruz and Rubio who have 11 and 10, respectively. There were 30 delegates at stake in Nevada, and a whopping 595 available one week later on Super Tuesday.
Trump, in his victory speech, dismissed the notion that if more GOP candidates drop out of the race, they'll coalesce around an alternative.
"They keep forgetting that when people drop out, we're going to get a lot of votes," he said.
Nevada's caucusing played out in schools, community centers and places of worship across the state — a process that's been chaotic in the past.
Count Tracy Brigida, fed up after her husband was laid off from his mining job, among those caucusing for Trump.
"I want a businessman to run the biggest business in the world," Brigida said as she caucused at a Las Vegas high school.
Jeremy Haight drove straight from his marketing job to caucus for Marco Rubio at the same high school.
"He's the most level-headed. He hasn't said anything stupid or crazy ... which is really what I think the country needs," Haight said.
It was Cruz for Megan Ortega, who declared: "He's consistent, he's bold and he's a class act."
Preliminary results of the entrance poll found that about 3 in 10 early caucus goers said the quality that mattered most to them in choosing a candidate was that he shares their values, slightly more than the quarter who said they want a candidate who can win in November. About a quarter said they want a candidate who can bring change. About 2 in 10 want one who "tells it like it is."
Trump — no surprise here — was supported by nearly 9 in 10 of the "tell it like it is" voters.
The entrance poll survey was conducted for The Associated Press and the television networks by Edison Research as Republican voters arrived at 25 randomly selected caucus sites in Nevada.