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by bra4you 2327 days ago
"Is that a universal truth, or is it historical? Situational?"

It it experience based on historical data. A virus jumping to a new host (species) will be more aggressive in the beginning until it has adopted (mutated) to his new host.

While this is not a universal truth, it is experience and could also be backed up mathematically (>host dies to soon, virus can not spread) and by game theory.