> Specificity samples were derived from de-identified excess serum specimens sent to our clinical virology laboratory in 2018 and 2019.
So...not five years ago, and it is even possible that a significant number were from late 2019.
> Specificity samples were derived from de-identified excess serum specimens sent to our clinical virology laboratory in 2018 and 2019.
So...not five years ago, and it is even possible that a significant number were from late 2019.