TABLE 4.

Determination of JCPyV serological results^a

Basel3 result	Helsinki1 result	Preadsorption result	Final serostatus	False-positive result	False-negative result
Positive	Positive	Positive	Positive
Positive	Negative	Positive	Positive		Helsinki1
Positive	Negative	Negative	Negative	Basel3
Negative	Negative	Negative	Negative
Negative	Positive	Negative	Negative	Helsinki1
Negative	Positive	Positive	Positive		Basel3

^aSamples were defined as positive if the OD was above the cutoff (0.11 for Basel3 and 0.156 for Helsinki1) and if preadsorption reduced the OD by ≥35% for an OD of ≥0.08.