A recent study compiled by researchers from the Charles University in the Czech Republic revealed that women infected with a parasite, Toxoplasma, found in cat feces are more likely to give birth to boys.

According to researchers, the Toxoplasma positive mothers gave birth to more boys than did Toxoplasma negative women. The increased survival of male embryos in infected women may be explained by toxoplasmosis' modulating and suppressing effects on the immune system.

Meanwhile, researchers caution that this observational study suggests that toxoplasmosis may be the cause of this increase in male births, but it cannot establish cause and effect, Medical News Today reported.

The results of study was published in this weeks issue of Springer's journal Naturwissenschaften.