Whilst the presence or absence of serum antibodies against these full length proteins (detected by Western blots) was not significantly different between participant cohorts (infertile or treated infections), there was a trend towards different IgG subtype serological responses depending on the participant disease cohort (CtTsp was recognised by IgG3 in the single resolved infection cohort only) [11]. The gene discussed is IGHG3; the disease is infection.