dr. chan, could you start by telling us what exactly radon is? dr. chan: well, thank you for having me. radon is a naturally occurring gas that can eat into your home. you cannot see it, taste it, smell it, see you not notice there in less you test for it. is a gas produced from the breakdown of the breakdown of oil that naturally occurs in rocks and granite, which we have a lot of in the state of new hampshire. through a water source. you can find radon and water, especially if it is an underground source of water like a private well. open air sources like lakes and rivers are not much of a concern . the issue with water is not even adjusted necessarily but more as you shower and bait and cook with it, the radon gas will be released into the air, and then you can breathe it in. exposure to radon depends on how long they are in the environment for, what kind of home they have, the construction -- there are a lot of factors. adam: we always hear about in the basement. what is the interaction be

kristen: dr. chan says the virus is not spreading in the u.s., but residents are being asked to avoid affected areas. the lefevbre family says after cancelling their trip to st. thomas, they are out due to $4200 rental fees. only 60% was refunded, but on the bright side they say the accommodating. but apparently it' safety and not making the situation worse than it already is in the united states. kristen: public health officials say new hampshire does not have the kind of mosquitoes that can transmit the zika virus, but the state is preparing to assist those who might become infected elsewhere. head to wmur.com for more information. live in studio, kristen carosa, wmur news 9. stephanie: thank you. still to come on news 9 at 6:00. former bruins players are on the ice for a great cause. hayley: temperatures were incredibly mild today. we will have one temperatures tomorrow. stephanie:istephanie:capmikees we have breaking news in hooksett. we will have the latest when we get it. former boston bruins pla

dr. chan: the level of alarm is extremely high. kenneth: more than 30 people have zika in the u.s., all brought back from travel abroad. the virus, which could cause brain development issues in the americas, mostly brazil. home of the summer olympics is ground zero. abc' s dr. richard besser is in rio de janeiro. dr. besser: so far, more than 1.5 million cases, more than 4000 babies on with severe brain damage. kenneth: pregnant women have been told to postpone travel to affected areas. zika is not contagious person to person, but there is still a risk. dr. besser: if someone is infected and comes back to the united states and is bit by a mosquito, that mosquito can bite other people and be infected. kenneth: in the u.s. territory of puerto rico, about 20 reported cases of zika. health officials are warning people to use bug repellant and mosquito nets over beds. dr. schuchat: mosquito control is pretty difficult. the mosquitoes that are the daytime, and they' re pretty aggressive biters. kenneth: more airlines and latin america ar

. >> the goal according to dr. chan is three-fold. you want to make sure you have the appropriate amount of we want to say is this an international health threat or not? you want all of the resources going to the right places and prioritize which countries need what. that's the basis of the meeting. >> okay. dr. natalie azar, thank you. we like to know what you are concerned about when it comes to the zika virus. you can tweet us. @todayshow. we will answer some of the questions in the next hour. >>> in canada, a major avalanche has killed five people. the avalanche in mcbride, british columbia swept through snowmobilers in the area. >>> a social media giant is taking a stand against private gun sales. facebook announcing it bans users from working out private sales on instagram and users directly on the social media services, they often use the site and ask to connect and coordinate deals on weapons, parts and ammunition. the move is hoped to cut down on unlicensed sales. licensed dealers and gun clubs can post. >>> and a stunning up

(sot dr margaret chan/who director-general)the increased incidence of microcephaly is particularly alarming(gfx)the un health agency estimates 3-4 million cases of zika infection are possible in the americas over the next year.cdc officials say the disease is now in more than 20 countries mostly in central and south america. (show mosquito file) but u.s. health officials say based on borne illnesses they expect the number of cases here to remain small.anthony fauci/director, national institute of allergy & infectious disease)we do not believe there will be a major outbreak of zika in the united states.the cdc says almost all of the u.s. cases are among people who traveled abroad. (show pregnant women file) health offficials are urging pregnant women not to travel to the affected regions unless absolutely necessary. omar villafranca, cbs news, new york. 3 the cdc says there are two possible vaccines for the virus. clinical trials will start at the end of the year but there will not be a widely available vaccine for at least several years. 3 <

dr. margaret chan/who director-general:the increased incidence of microcephaly is particularly alarming, as it places a heartbreaking burden on families and communities." the centers for zika is now in more than 20 countries, mostly in central and but u-s health experience with other mosquito- borne illnesses, they expect the small number of cases here to remain the c-d-c says nearly all u-s cases are among people who have traveled abroad. icon could temporarily become a quiet trickle. more than 750- thousand gallons of every second. but new york state might have to shut down most of the falls on the u- s side. it needs to temporarily block the water to replace two 115- year old stone bridges. the've been closed to the public since 2004, rotted and rusted from a century next to the falls. mark thomas / new york state office of parks: "either we replace them, or they're going to crumble into the river. if they crumble into the river, we're going to have an environmental mess to clean up." this isn't the first time the iconic falls have stopped flowing. in 19-69, the u-s army corp of water

dr. margaret chan said the virus was becoming much more of a threat. the w.h.o. said the americas could see up to 4 million cases of zika in the next year. she also noted the possible relationship between zika infections and guillain-barre syndrome, which can cause temporary paralysis. i'm hanging out with scooby doo. its one of the trucks here at this weekend coming up. the son of a polish immigrant who grew up in a brooklyn tenement. he went to public schools, then college, where the work of his life began -- fighting injustice and inequality, speaking truth to power. he moved to vermont, won election and praise as one of america's best mayors. in congress, he stood up for working families and for principle, opposing the iraq war, supporting veterans. now he's taking on wall street and a corrupt political system tackling climate change to create clean-energy jobs, fighting for living wages, equal pay, and tuition-free public colleges. people are sick and tired of establishment politics, and they want real change! [ cheers and applause ] bernie sanders -- husban

. >> the goal aording to dr. chan is three-fold. you want to make sureou have internatiol concer internatiol health threat or not? youant all ofhe resources ingo the rht place and prioritize whichouries need what. that's the basis of the meeting. >>kay. dr. natalie az, thank you. we like to know what you ar concerned out when it comes to the zika virus. you can tweet us. @todayshow. we will answer some of the questions in theext hour. >>> in canada maj has kill has kied five people. the avalanche in mride, british columbia swept tough snowmobilers in the area. >>> a social media giant is taking a standgainst priva n sales. facebook announcing it ban users fm worng out private sales on instagram and urs directly on sia media services, theften use t site a asko connect a coordite deals on weapons, pas and ammunition. the move is hoped to cut down on censed sales. licensed dears and gun clubs can post. >>> and stunning upset in tennis. rena willms, as we mentioned, vying for a record ing number of grand amins this morning as s met geli

dr. margaret chan, the director general of the world health organization said, "the level of concern is highthe level of uncertainty. questions abound. we need to get some answers quickly." what are the questions and what are the answers that we need ton? >> well, the first question that's really a very important question is what is the nature of this relationship between infection of pregnant women and the birth defects that are clearly temporally and geographically associated with the major increase in zika is a major increase in seeing these birth defects. whether or not there's cause-effect there, that's one of the big unknowns. is it zika alone that's doing it? is it something else that's doing it, along with zika being there and it has nothing to do with zika? or is it zika virus sinner guying with-- synergizing with something else causing it. that's the big unnine because if you put aside the situation and the problem and the issue with pregnancy, when you're dealing with a pregnant woman, that's where the real concern, is but that's also where the big unknown is. >> rose: so with all

dr. margaret chan said the virus was becoming much more of a threat. the who said the americas could see up to 4 million cases of zika in the next year. chan said there is no proof that it was responsible for the number of babies being worn with small heads. >> the possible links only recently suspected have rapidly changed the risk profile of zika from a mild threat to one >> the who will hold an emergency meeting of independent experts on monday to decide whether the outbreak should be declared an international health emergency. >>> there were memorials public and private across the country and even in space today for the 30th anniversary of the shuttle challenger disaster. the most public service was at the kennedy space center in florida where the disaster happened on january 28th, 1996. >> reporter: after a half dozen delays leading up to it, the shuttle challenger launched florida. the 7 astronauts' family and friends and plenty of others watched from the grandstands. but shuttle launches had become so routine that only one country to watch. that

as we said, we n need to remember dr. chan, this beautiful baby's mom is a doctor, she's a pediatrician. clearly, she's practicing what >> seems just like the baby was born. how do parents g around fingd the schedule to keep? >> well, look, there is a set schedule. think parents need to ask questions to their child's pediatrician. the pediatricians willanswer. they'll counsel, explain, advise. they'll say what's remitted edrecommended and when. i'll s sayrobay the biggest tip i can give, that vaccination brg it with you. get cop pois of it. every school and camp your child goes to, basically for life, will need that documentation. you know. there are some patientrents who say no, they don't want to have their children vaccinated. mark and his wife have been on the forefront. >> they have the wealth, the fame, the platform the share philanthropists. health. they'v've given $25 million to cdc to fight ebola. again. >> yes. >> thank you so much. amy? >> hey, here's a look at what's coming up next on the "gma morning menu." we hav

as we said, we need to remember, dr. chancing what she preaches. >> seems just like the baby was born. how do parents go about finding the best -- the schedule to keep? >> well, look, there is a set schedule. i think parents need to ask questions to their child's pediatrician. the pediatricians will answer. they'll counsel, explain, advise. they'll say what's recommended and when. so many parents worry, if they miss a dose do they have to start from scratch? the answer is no. i'll say probably the biggest tip i can give, that vaccination record is gold. bring it with you. get copies of it. every school and camp your child goes to, basically for life, will need that documentation. >> you know this is controversial. there are some parents who say no, they don't want to have their children vaccinated. mark and his wife have been on the forefront of making sure not just their child but around the world. >> yes. and look, they have the wealth, the fame, the platform the share their message. we know they're global philanthropists.

dr. margaret chan. she says "the level of alarm is extremely high." the relatively new mosquito- borne disease is now in 23 countries and territories... but a leading obama administration health official says he doubts the u-s is vulnerable to the widespread outbreak... which has been linked to a wave of birth defects in brazil. the southern districts says confirmed cases of the zika virus in southern nevada. but warn that women who are pregnant or trying to get pregnant should avoid traveling to areas where the virus is circulating. the man arrested for pointing a gun at people on the las vegas strip appears before a judge. humming restrained and wearing a spit hood when he was wheeled into the courtroom yesterday. black moaned through most of his appearance. the 20-year-old is facing an assault with a deadly weapon charge. black's brothers says he has mental health issues and that he needs treatment... because he had stopped taking medication for schizophrenia days before the incident. "he's not violent at all, he's a big teddy bear, he's a huge ted

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dr. sonler. and they are appealing the verdict. >>> up next, from "magic mike" to lip sync battles, channing tatum took the stage and beyonce crashed the party. so who had the fiercer performance? >>> abc news "nightline" brought to you by pfizer. i was able to quit in three months. and that was amazing. to help people quit smoking. it absolutely reduced my urge to smoke. some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. some had seizures while taking chantix. if you have any of these, stop chantix and call your doctor right away. tell your doctor about any history of mental health problems, which could get worse or of seizures. don't take chantix if you've had a serious allergic or skin reaction to it. if you have these, stop chantix and call your doctor right away as some can be life-threatening. tell your doctor if you have heart or blood vessel problems, or develop new or worse symptoms. get medical help right away if you have symptoms of a heart attack or stroke. decrease alcohol use while taking chantix. use caut

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