[Harmless Teddy Bear]

If they can’t, then why on Earth do they become so widespread now?

Because they can be treated rather then people just dropping over dead.

When people have strokes we can actually treat them and, if done fast enough, can restore them to close to normal condition. This can happen several times.

Back a thousand years ago you got elf shot only once and you died.

[miniTAX]

“Because they can be treated rather then people just dropping over dead.”

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Being treatable or not is irrelevant to the fact that diseases like diabete or hypertension or even cancer CAN be spread, by nutrition, culture, change of habits or ... experimental vaxx.
If they can’t be spread, we’ll have the same rate of occurence of them now than 50 years ago. We don’t.