Can anyone tell me if there is any way to tell the difference between TH1 & TH2 based on the presence of antibody in serum? I know that IGA suggests a TH2 but what about IGG1, IGG2, & IGG3. I am looking for this info on human or primates and not murine responses. Thank you for your help D. Verhoeven deverhoeven at ucdavis.edu