Source: https://www.healthmap.org/en

Source: https://earth.nullschool.net

Source: https://diseasemaps.usgs.gov/mapviewer

Source: https://www.liveebolamap.com

Source: https://www.cdc.gov/chikungunya/geo/index.html

Source: https://www.cdc.gov/flu/weekly/usmap.htm

Source: https://www.wunderground.com/maps/us/2xFlu.html?MR=1

Source: http://outbreaks.globalincidentmap.com/home.php (To view this map you have to click on the Source URL).

Source: https://climateviewer.org
Climate Viewer is not so much for real-time virus and plague use, but more so a global map that can display historical scientific data of many types: ancient ruines; lightning; cloud seeding; weather modification; earth quakes; previous nuclear test explosion locations; etc.