CD79A and spontaneous abortion: Some studies have documented associations between miscarriage and prior chlamydial infection as demonstrated by anti-chlamydial IgG and IgA antibodies and detection of chlamydial DNA/antigen from products of conception and placentas of miscarriages [52, 85, 105, 106]; one study found that women with positive chlamydial serology were more likely to have miscarriages than controls (aOR 2.3, 95% CI 1.1–4.9), and C. trachomatis DNA was more common in products of conception and the placenta in women with miscarriage than in controls (4% versus 0.7%, and p = 0.026) [105].