2月4日CNN聽力：世衛構造表現寨卡病毒在美洲爆炸性流傳 美國總統候選人提名前線戰愛荷華黨團集會拉開帷幕
Fridays and flannel are awesome!
I'm Carl Azuz, with January's last edition of CNNSTUDENT NEWS.
First up, the World Health Organization, part of theUnited Nations, it says the Zika virus is nowspreading explosively in the Americas.
It's not new to the world.
Zika has affected equatorial Africa and Asia since the 1940s.
But it was thought to be relatively harmless until last year.
That's when it arrived in the western hemisphere.
That's when it was linked to a severe disorder in babies.
Over the next 12 months, officials estimate there will be 3 million to 4 million Zika infections inthe region.
Health officials say the El Nino weather pattern could help spread the virus.
It's expected to increase the populations of mosquitoes the carry Zika.
Researchers are pushing for international efforts to control mosquitoes and speed up vaccineresearch to fight the disease.
Here's what we know about Zika.
Some of it will frighten you-but maybe not as much as you think.
It's a mosquito-borne virus.
Part of the same family as yellow fever, West Nile, Chikungunya and dengue.
As things stand now, there is no vaccine to prevent Zika, or a medicine to treat the infection.
The most common symptoms include fever, rash, headaches and red eyes.
But 80 percent of people who get Zika won't even know they have it.
That's right. There are only symptoms in one in five people.
Now, the virus is spreading quickly across Central and South America and the Caribbean.
What makes Zika so scary is it's alarming connection between the virus and microcephaly-thatis babies being born with heads and brains that are too small.
In Brazil and several Latin American countries, they're becoming concerned enough they haveasked women there not to get pregnant.
In the United States, pregnant women are being told to postpone travel to any of thesecountries.
In case you're curious, this is the bloodsucker everyone is after.
The female Aedes Aegypti, she's an aggressive biter, but unlike other mosquitoes, feedsmostly during the day.
For example, she's different than the mosquitoes that transmit malaria, like to feed at night.
That's important, because bed nets won't help as much here.
The best way to prevent infections is using insect repellant with DEET, wearing thick longsleeve shirts and long pants and staying inside, in screened, air-conditioned areas as much aspossible.
For your chance to get on "Roll Call", please make one request daily at CNNStudentNews.com.
We're taking you to Central Europe today.
First time we've ever shouted out Slovakia, and it's great to have viewers at Business Academyin Trnava.
Western Nevada is on the roll with Dayton Intermediate School.
The Sun Devils are watching from Dayton.
In our third stop is in Central Washington. Hello to the Warriors.
Wahluke Junior High School is in Mattawa.
In the race for the White House, 12 Republicans are running to win their party's nomination forpresident.
Three Democrats are running to win their party's nomination.
There will be only one from each party who actually appears on the ballot this fall.
How will each final candidate be determined?
That's done through a series of primaries and caucuses, ways that voters in each state helpchoose each party's nominee.
The process officially starts Monday.
The Hawkeye State of Iowa holds the first in the nation caucuses.
Why Iowa? Because in the 1970s, the state decided to schedule its caucuses ahead of theprimaries than all other states.
It even made a law about it.
It says Iowa's contest must happen before all the others by at least eight days.
So, if another state decided to schedule a primary on January 15th, for example, well, Iowawould then move its caucuses date up to January 7th.
Keep this in mind, though, whoever wins Iowa doesn't necessarily go on to win their party'snomination.
Sometimes they do, sometimes they don't.
But winning Iowa does give candidates momentum.
It keeps their names in the media.
It helps them with fundraising and party interests.
So, as we get ready to see how these contests play out next week, we're starting with anexplanation of what exactly a caucus is.
The Iowa caucuses, this is what we've been leading up to all this time.
And for the Republicans, it's a simple matter.
They show up on caucus night.
And they cast their ballots and they count them.
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