Science used to believe in immunity.

:0)

The statistics on Spanish flu are that it infected about 1/3 of world population. Makes you wonder about Fauci saying 90%.

I question so much now when they keep flipping positions. Masks do not work to you need to where them. It is killing people to only killing people with other health issues. The antibodies make you a carrier or we need them for herd immunity.

From back in Jan 2019, Fauci said it was not something to worry about. Some expert he turned out to be. I do not listen to him anymore.

Jan 2019?
Are we still talking about Covid??

My bad! 2020

Nah, we have healthy food and rarely have malnutrition in first world countries. Its a wonder its not lower than 0.66% death rate right now.

I’m referencing herd immunity through either infection or vaccination.

You can't get herd immunity through vaccination due to the low effectiveness of most vaccines. Also the fact that they are temporary makes it impossible to get herd immunity.
If you get it naturally its usually for life and affects similar viruses.

The Spanish flu had somewhere between 1%-7% survival rate.

Do you mean Infection Fatality Rate (IFR - the percent of all infected who die)? 1.8 billion world population in 1918. One third of population infected is 600 million. Approximately 17 million died. 17M dead / 600M infected = 2.83% IFR. In other words, of all the people who contacted Spanish Flu, 97.17% lived.

“ One of the oldest estimates was made by Jordan in 1927 (1), who estimated the global burden to be approximately 21.6 million deaths”

2018 analysis of Spanish Flu deaths at 17 million
Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7314216/

Yes, in this case covid is at 0.66% death rate of infected.