dr. mark siegel is here.radicated mumps with vaccines but it has made a come back. >> let's not make this an anti vaccine segment. i love the vaccine and i think it has done a tremendous job eradicating mumps but it is only 90% effective. the other problem is not everybody is vaccinated. so it gets into populations that aren't vaccinated and spreads among people who aren't immune and think they aren't in the close confine them off hockey team when they're in the locker room together is easy to spread. is a respiratory virus that causes swelling, haiti, fatigue and loss of appetite. stuart: when it comes to these old-line diseases i thought compulsory vaccination had gotten rid of most of them but it appears vaccination is no longer compulsory and these diseases are making a come back and that is a terrible thing with the entire vaccine movement. >> exactly right. it started in your home country in great britain because of the studies that was later discounted the show a connection between the vaccine and auti

dr. mark siegel, member of our fox medical a-team has more. >> well, the number of cases in sierra leone and guinea continue to rise. the number of new ebola patients in liberia is down significantly thanks to the coordinated work of the u.s. military, the world health organization, the cdc and the heroic efforts of volunteer groups such as doctors without borders. >> we see kids that are suffering from ebola. they just don't feel well. they want to be touched. they want to be hugged. >> reporter: nurse marina novak from doctors without borders recently returned from sierra leone. >> there's always a risk a child could knock off your goggles or, you know, tear through your protective equipment, you're unable to carry them. >> reporter: novak is one of thousands of aid workers with the organization. director so fi says one of the biggest challenges is that ebola is a moving target. >> they are still there but they are elsewhere in different forms. >> reporter: doctors without borders has admitted more than 6,000 patients and shipped more than 1200 tons of equipment to fight the disease. b

dr. mark siegel is here to argue with me because i am not getting a flu vaccine if the thing is not 100%d not even 60% effective. >> i know you like numbers so that we give you the numbers to still bolster my side of the argument. the centers for disease control, the scene people you talking about, estimate the flu costs $10.4 billion a year in hospitalization and in clinic visits and you know what the flu shot those? decreases the need to go to hospitals or clinics at least 40% of the time. on a bad year 40%. on a good year 60%. that is less money spent on health care. also people get bad diseases like pneumonia. they die from the flu. stuart: that is a lousy deal. >> allows the deal? not dying is a lousy deal? bernard: when you offer me a product, i have to pay for it in you tell me it works 40% of the cases. half the time it will work but by any way. >> what is the downside of getting the flu shot? >> stuck into your arm that goes into your system. >> it is did. it doesn't cause the flu. doesn't cause major side effect. you might get a slight allergy from. what if you have in your hom