With good sanitation and medical services, it's almost impossible to have another plague like the ones before.
Even the Fort Riley Kansas Vaccine-derived Meningitis (aka the Spanish Flu) could only kill so many because of the poor sanitary conditions of world war 1 - and that was before indoor plumbing was virtually universal.
And evidence suggests it may have been the fact that people were wearing masks as a preventative measure, causing them to contract a secondary, bacterial infection in tissue already damaged from the virus, that actually led to a high death rate.
With good sanitation and medical services, it's almost impossible to have another plague like the ones before.
Even the Fort Riley Kansas Vaccine-derived Meningitis (aka the Spanish Flu) could only kill so many because of the poor sanitary conditions of world war 1 - and that was before indoor plumbing was virtually universal.
And evidence suggests it may have been the fact that people were wearing masks as a preventative measure, causing them to contract a secondary, bacterial infection in tissue already damaged from the virus, that actually led to a high death rate.