Well...by trying to key in and nail Gailey on a technicality, you've only shown your own incompetence with the english language. When referring to a medical test using "positive" and "negative", it can only be positive or negative. There is no half positive, or 75% positive, or 33% negative. By using the word "as", Chan implied that he was speaking about something other than a binary situation. Thus, we can infer that he was speaking about the what all the results, taken together, said about Earls' condition. If you think that it would be better for Earls' situation to be negative, I think you are alone. I think you are also the only one who misinterpreted Gailey's statement, if in fact you honestly did and weren't just looking for something to bash him about.