OBJECTIVES: The purpose of this study was to describe the source, length, number of views, and content of the most widely viewed Zika virus (ZIKV)-related YouTube videos. We hypothesized that ZIKV-related videos uploaded by different sources contained different content. METHODS: The 100 most viewed English ZIKV-related videos were manually coded and analyzed statistically. RESULTS: Among the 100 videos, there were 43 consumer-generated videos, 38 Internet-based news videos, 15 TV-based news videos, and 4 professional videos. Internet news sources captured over two-thirds of the total of 8 894 505 views. Compared with consumer-generated videos, Internet-based news videos were more likely to mention the impact of ZIKV on babies (odds ratio [OR], 6.25; 95% confidence interval [CI], 1.64 to 23.76), the number of cases in Latin America (OR, 5.63; 95% CI, 1.47 to 21.52); and ZIKV in Africa (OR, 2.56; 95% CI, 1.04 to 6.31). Compared with consumer-generated videos, TV-based news videos were more likely to express anxiety or fear of catching ZIKV (OR, 6.67; 95% CI, 1.36 to 32.70); to highlight fear of ZIKV among members of the public (OR, 7.45; 95% CI, 1.20 to 46.16); and to discuss avoiding pregnancy (OR, 3.88; 95% CI, 1.13 to 13.25). CONCLUSIONS: Public health agencies should establish a larger presence on YouTube to reach more people with evidence-based information about ZIKV.
Africa ; Anxiety ; Health Communication ; Internet ; Latin America ; Pregnancy ; Public Health ; Social Media ; Zika Virus*

OBJECTIVES: Lyme disease is the most common tick-borne disease. People seek health information on Lyme disease from YouTube™ videos. In this study, we investigated if the contents of Lyme disease-related YouTube™ videos varied by their sources. METHODS: Most viewed English YouTube™ videos (n = 100) were identified and manually coded for contents and sources. RESULTS: Within the sample, 40 videos were consumer-generated, 31 were internet-based news, 16 were professional, and 13 were TV news. Compared with consumer-generated videos, TV news videos were more likely to mention celebrities (odds ratio [OR], 10.57; 95% confidence interval [CI], 2.13–52.58), prevention of Lyme disease through wearing protective clothing (OR, 5.63; 95% CI, 1.23–25.76), and spraying insecticides (OR, 7.71; 95% CI, 1.52–39.05). CONCLUSION: A majority of the most popular Lyme disease-related YouTube™ videos were not created by public health professionals. Responsible reporting and creative video-making facilitate Lyme disease education. Partnership with YouTube™ celebrities to co-develop educational videos may be a future direction.
Cross-Sectional Studies* ; Education ; Health Communication ; Insecticides ; Lyme Disease* ; Protective Clothing ; Public Health ; Social Media ; Tick-Borne Diseases