it does happen with some viruses
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Replying to @leilamechoui
Not just HIV. Polio is a good example where the vast majority who get it aren't symptomatic (or barely) yet can & do spread the disease. The live weakened Polio Vaccine takes advantage of this to infect & effectively immunize many of those who come in contact with the vaccinated.
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Replying to @as_a_as_a @leilamechoui
Children also notoriously spread diseases that don't affect them. "Asymptomatic spread" is an assumption based on what containment measures work to what extent; you only get ebola or MERS if you're in the room with someone who's severely ill, and thermometers work to catch SARS.
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Replying to @leilamechoui @as_a_as_a
Everything is a symptom of C19, including bizarre subjective effects like loss of taste and smell. If you want to narrow it to a specific objectively measurable symptom - fever, say - well, thermal screening didn't protect the White House.
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I just did. If you're asking why scientists don't put test subjects in the room with potential vectors of infectious disease I might recommend another country to move to, but even if carrying out the research is possible you still won't find *published* results.
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