2 added 9 characters in body
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"Some kind of exotic particle? Or perhaps a form of gravity that we haven't encountered yet?"

I'd go way more realistic: make it a virus, (maybe developed by some weird apocaliptic cult), and there you go.

Wikipedia states that

Aphasia is an inability to comprehend or formulate language because of damage to specific brain regions

Which is perfectly achieveableachievable for aa fungus or virus. Making it "handmade" would explain how it coudcould spread so far/quick.

The few/one normal people could have a natural immunity, oder or could be one of "the chosen few" from the original cult, that had some sort of cure genetically implanted.

"Some kind of exotic particle? Or perhaps a form of gravity that we haven't encountered yet?"

I'd go way more realistic: make it a virus, (maybe developed by some weird apocaliptic cult), and there you go.

Wikipedia states that

Aphasia is an inability to comprehend or formulate language because of damage to specific brain regions

Which is perfectly achieveable for a fungus or virus. Making it "handmade" would explain how it coud spread so far/quick.

The few/one normal people could have a natural immunity, oder be "the chosen few" from the original cult, that had some sort of cure genetically implanted.

"Some kind of exotic particle? Or perhaps a form of gravity that we haven't encountered yet?"

I'd go way more realistic: make it a virus, (maybe developed by some weird apocaliptic cult), and there you go.

Wikipedia states that

Aphasia is an inability to comprehend or formulate language because of damage to specific brain regions

Which is perfectly achievable for a fungus or virus. Making it "handmade" would explain how it could spread so far/quick.

The few/one normal people could have a natural immunity or could be one of "the chosen few" from the original cult, that had some sort of cure genetically implanted.

1
source | link

"Some kind of exotic particle? Or perhaps a form of gravity that we haven't encountered yet?"

I'd go way more realistic: make it a virus, (maybe developed by some weird apocaliptic cult), and there you go.

Wikipedia states that

Aphasia is an inability to comprehend or formulate language because of damage to specific brain regions

Which is perfectly achieveable for a fungus or virus. Making it "handmade" would explain how it coud spread so far/quick.

The few/one normal people could have a natural immunity, oder be "the chosen few" from the original cult, that had some sort of cure genetically implanted.