Does the line’s darkness matter?
Kind of. If you test positive—faint or not—it means that you have infectious COVID-19 particles in your body, Dr. Russo says.
But how dark the line is does give you a little insight into what’s going on, Dr. Adalja says. “The less dark, the line is, the less viral material that is present,” he says. “This could reflect diminishing contagiousness, or the start of it.”
Meaning, you could be becoming more contagious or less contagious at that point, but a lot depends on the context. If you’ve been sick for a while and get a faint test result, it might mean you’re getting better and are less likely to make others sick. If you just started feeling sick and you got a faint line, you likely only recently became infectious…
Source: What does a faint line on a COVID-19 rapid test mean?

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