https://www.post-gazette.com/news/health/2020/01/18/Norovirus-outbreak-hits-Yosemite-Valley-Park-with-170-suffering-symptoms/stories/202001190119
https://www.post-gazette.com/news/health/2020/01/18/Norovirus-outbreak-hits-Yosemite-Valley-Park-with-170-suffering-symptoms/stories/202001190119