CASE
WHEN "%IM0951%" = "Reactive" THEN
    "Positive"
    OR
WHEN "%IM0952%" = "Reactive"THEN
    "Positive"
    OR
WHEN "%IM095%" = "Reactive" THEN
    "Positive"
WHEN "%IM0951%" = "Non-reactive" THEN
    "Negative"
    OR
WHEN "%IM0952%" = "Non-reactive"THEN
    "Negative"
    OR
WHEN "%IM095%" = "Non-reactive" THEN
    "Negative"
ELSE
    "Inconclusive"
END