Could be, but the ten times I donated plasma at a children’s hospital, they kept telling me I was negative for RSV.
Given that the plasma was going to children getting chemo, they were happy I didn’t add anything infectious to the mix.
Whatever. I have no idea why I test negative.
P.S., Now that I’ve had the RSV vaccine, I might test positive for RSV if what they look for is antibodies against the virus.