“However, DNA testing has unearthed new evidence about what really killed 80% of the Aztecs.”
Since Paratyphoid fever only killed about 1% of those infected (before antibiotics existed) it’s doubtful it killed 80% of Aztecs.
“Since Paratyphoid fever only killed about 1% of those infected...”
1% of Europeans with modern medical care.
Now adjust for no resistance and no medical care.