When studying the effect of toxoplasmosis on the course of pregnancy we discovered another phenomenon, which we had not previously expected and whose existence shocked us. Šárka Kaňková, my undergraduate student at the time, noticed that latent toxoplasmosis also influences the sex ratio at birth (SRB); that is, the ratio of sons to daughters (92). Specifically, we found that Toxo positive mothers gave birth to more boys than girls (Fig. 45). But this relationship is only true for women with high or medium levels of antibodies, i.e. >> Read more