I think at this stage of the game it will be pretty hard to determine this.
I recall the Chinese gal that flew to Germany to work with a firm for a week and infected a bunch of the Germans. They finally tracked her down a week later in China. She never showed symptoms.
And what about the first(?) guy in New York? He got 40+ people sick as he was going about his daily routine and feeling fine at the time.
Of course I didn’t read the article. Perhaps they both had a tickle in the throat. “See - they DID have symptoms!”
Thats an overlooked point
They “ said” they had no symptoms
However, how could the viral load be high enough to infect others but trigger no response in the host immune system?
And if they were immune ( which some claim is not possible) then how did the viral load in their immune bodies increase and survive for days, to be shed on others?
Suspicion: they had symptoms that were mild enough to deny, pass off as a cold or allergy, or simply treat with OTC meds