joining me erin tolbert, an e.r. nurse prank tisher in. welcome to the show. good to have you back here. i'm going to get the flu shot but could i still get the flu. >> you really could. the virus mutated. this flu shot protections against two strains of flu ha and two strains of flu-b. we created the. even if you have gotten vaccinated you still could get sick. gerri: have are you seeing people in the e.r. now who still got sick. >> unfortunately whole family on monday, two kids, three parents, all have the flu. they have gotten flu vaccine. this is something we'll see a lot this year. studies are showing based on data we already have for this year's flu season, when it comes to this strain, flu shot is only effective 48% of the time. unfortunately we'll see lot of people getting sick this year who weren't really planning on it. gerri: should people get the flu shot? is there any value getting it at this point? >> there is still value getting it. there is some cross reactivity. even though the flu shot is not completely effective, it may decrease symptoms if

practicetion, erin tolbert., table tops where germs can live. >> you see teenagers, how does that kid wearing shorts right now, he's going to catch a cold but not true. >> not true. >> the teenager has a leg up on me. >> not true. >> here's another one, maybe it's a myth. tell us. you don't need as much water in the winter. you don't need to drink as much water? >> this is false. it's a very common misconception. you need as much water in the winter as the summer. the reason for this is those mucous membranes in nose and mouth help you from getting sick. if you are dehydrated it can't trap germs and viruses that make you ill. so you need to stay i had decorated. men need about three liters of water a day. ladies about two. that's about 13 glasses for guys, nine glasses for women. >> you know erin is serious when they looks in the camera. what about this one. i've heard about this. wear a hat because we lose 90% of our body heat from our head. is that true? >> it's false. there was an interesting study done in th