You read sometimes about swimmers who contract an ameoba through their nose. Typically in the late summer, in relatively stagnant pools or streams, and more in the southern states. Ingesting an ameoba might destroy it by stomach acids. Coming in through the nose it can enter your circulatory system via the respiratory system. So I understand.
Sounds like a terrible way to go as I don’t know what can be done for a person once it reaches the brain.
My neighbor somehow got a flesh eating bacteria in his arm. By the time he finally went to the hospital he was beyond saving and died the next day. It was very tragic as he had a family and was only in his mid 40s. I don’t believe they ever identified where he got it from.