perfcurve with simultaneous conditions

Hi everybody, suppose I want to obtain the ROC curve por example with patients with and without fever... so it's very simple, I do next code:

% 'fever' is  a vector with temperature measures of 'Nfever' sick patients
% 'nofever' is  a vector with temperature measures of 'Nnofever' healthy persons
labels = [repmat('FEVER  ', Nfever, 1); repmat('NOFEVER', Nnofever, 1)];
scores = [fever; nofever];
posclass = 'FEVER  ';
[FPR, TPR, T, AUC, posopt] = perfcurve(labels, scores, posclass);

The code get me all the info in order to get the ROC curve and the threshold temperature level in order to say if a particular person has or not fever.

Now, suppose I have another two score vectors including cold and uncold info of this same group of people. This is, I can see if a person has fever and cold; has no fever and cold; has fever and no cold; and has no fever and no cold.

I looking for a ROC curve in order to see with people has simultaneosly fever and cold, and get the threshold level.

Could anyone help me ?

thanks in advance, Esteban