SGMD Gupta Ebola not airborne_00002915.jpg
Why isn't Ebola airborne?
Why Ebola isn't airborne: CNN's Dr. Sanjay Gupta explains, using a metal pipe, marbles, baby powder and a baseball
01:20 - Source: CNN
Inside deadly pandemics and diseases 20 videos
SGMD Gupta Ebola not airborne_00002915.jpg
Why isn't Ebola airborne?
01:20
Now playing
- Source: CNN
A Doctors Without Borders worker holds a child suspected of having Ebola in a treatment center in Liberia in October 2014.
Expert: 'There will be a pandemic'
01:09
Now playing
- Source: CNN
eitm gupta ebola symptoms origins_00011224.jpg
The facts about Ebola
03:44
Now playing
- Source: CNN
malaria mosquito Anopheles stephensi
What is malaria?
01:36
Now playing
- Source: CNN
MIAMI, FL - DECEMBER 04:  Alina Pastoriza Garcia, ARNP-NP-C, administers a flu vaccination to Russell Waddey at the CVS/pharmacy's MinuteClinic on December 4, 2012 in Miami, Florida. The Centers for Disease Control and Prevention announced that they are seeing significant increases in flu activity in the U.S. in the last two weeks indicating that an early flu season is underway and are encouraging people to get vaccinated.   (Photo by Joe Raedle/Getty Images)
Universal flu vaccine may be in future
03:44
Now playing
- Source: CNN
A mother and her baby, who has microcephaly, at the Altino Ventura Foundation Clinic in Recife, Brazil.
'We grossly underestimated' Zika, expert says
01:10
Now playing
- Source: CNN
What is listeria?
01:20
Now playing
- Source: CNN
Dr. Jennifer Caudle urges everyone to get their flu shot before the season is over.
Who puts everyone at greater risk for disease?
01:14
Now playing
- Source: CNN
norovirus explainer Cohen orig_00003306.jpg
How viral is norovirus?
01:11
Now playing
- Source: CNN
Health care workers, wearing protective suits, leave a high-risk area at the French NGO Medecins Sans Frontieres (Doctors without borders) Elwa hospital on August 30, 2014 in Monrovia. Liberia has been hardest-hit by the Ebola virus raging through west Africa, with 624 deaths and 1,082 cases since the start of the year. AFP PHOTO / DOMINIQUE FAGET        (Photo credit should read DOMINIQUE FAGET/AFP/Getty Images)
Dr. Sanjay Gupta answers: #EbolaQandA
02:29
Now playing
- Source: CNN
Zika volunteer vaccine trial patient orig llr_00010922.jpg
Meet one of the first Zika vaccine volunteers
01:19
Now playing
- Source: CNN
A Cambodian woman (R) buys chickens at a market in Phnom Penh on January 29, 2013. Two Cambodian girls have died from bird flu, health authorities said on January 29, raising the toll from the deadly infection in the kingdom to four so far this year. AFP PHOTO / TANG CHHIN SOTHY (Photo credit should read TANG CHHIN SOTHY/AFP/Getty Images)
Bird market: 'There's really a lot of virus here'
01:27
Now playing
- Source: CNN
eitm gupta ebola symptoms origins_00011224.jpg
Why isn't there an Ebola vaccine?
02:31
Now playing
- Source: CNN
pkg elbagir liberia ebola healthcare worker pov_00010705.jpg
Ebola battle through nurse's eyes
02:53
Now playing
- Source: CNN
teenages creats ebola test vause intv_00013606.jpg
Teenager creates Ebola diagnostic test
02:29
Now playing
- Source: CNN
When the Ebola virus was found in Dr. Ian Crozier's eye, the eye started losing its original blue hue, he told the New York Times.
Ebola found in doctor's eye
01:02
Now playing
- Source: CNN
LONDON - ENGLAND - SEPTEMBER 17: Dr Felicity Hartnell, who is a clinical research fellow at Oxford University, holds the vile of the ebola vaccine called Chimp Adenovirus type 3 (ChAd3) before the first healthy UK volunteer receives an ebola vaccine at the Oxford Vaccine Group Centre for Clinical Vaccinology and Tropical Medicine (CCVTM) on September 17, 2014 in Oxford, England. (Photo by Steve Parsons-WPA Pool/Getty Images)
The death of Ebola?
01:32
Now playing
- Source: CNN
rewind ebola victims Nancy Writebol orig_00000619.jpg
Nancy Writebol: 'I was in pretty bad shape'
02:20
Now playing
- Source: CNN
Why We Fear Ebola Gupta Quammen _00012230.jpg
Why We Fear Ebola
02:32
Now playing
- Source: CNN
Inside a flu vaccine lab
02:31
Now playing
- Source: CNN