Your brother is doctor of what, exactly? History? Sociology? Women's studies?
I have never in my entire professional career encountered a physician or scientist who is unaware that all infectious diseases have a prodrome period in which there are no symptoms.
I'll bet that you didn't read the link to the medical literature that I provided earlier, either.
“I have never in my entire professional career encountered a physician or scientist who is unaware that all infectious diseases have a prodrome period in which there are no symptoms.”
That is NOT what I said and you are being disingenuous. According to your way of thinking EVERY SINGLE person infected is “asymptomatic....until they are not. If that isn’t pure bs than nothing is.