字幕列表 影片播放 列印英文字幕 and finally here. Keep your questions coming on, Twitters or Dr Jen is back, and so many are asking. With cold and flu season here, how do you know the difference? How do you know when to call your doctor about possible corner? Sometimes the symptoms can overlap, David, but look at this list. It's fever over 100.4. Cough, fatigue, shortness of breath, body aches. Remember, they can be mild, so if you're concerned, you want to call your doctor. But the key thing, because we see this on Twitter a lot, that fever it's 100.4 exact that swimming or higher. Hi, everyone. George Stephanopoulos here. Thanks for checking on ABC News YouTube channel. If you'd like to get more video show highlights and watch live event coverage, click on the right over here to subscribe to our channel. And don't forget to download the ABC News after breaking news alerts.