Why did a study that deliberately infected people with flu and locked them in rooms together for four days fail to produce transmission 97% of the time?

The great FLU ILLUSION: Bombshell study proves transmission is a myth and PCR tests are junk science   – NaturalNews.com
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The great FLU ILLUSION: Bombshell study proves transmission is a myth and PCR tests are junk science – NaturalNews.com

What causes symptoms of respiratory illness? Why do some people get sick when they are around others who are sick, but someone else may not get sick at all? In the study, “Minimal transmission in an influenza A (H3N2) human challenge-transmission mod