Women infected with parasite Toxoplasma have more sons

@article{Kakov2007WomenIW,
  title={Women infected with parasite Toxoplasma have more sons},
  author={{\vS}{\'a}rka Kaňkov{\'a} and Jan {\vS}ulc and Kamila Nouzov{\'a} and Karel Fajfrlík and Daniel Frynta and Jaroslav Flegr},
  journal={Naturwissenschaften},
  year={2007},
  volume={94},
  pages={122-127},
  url={https://api.semanticscholar.org/CorpusID:9610443}
}
The results of the retrospective cohort study suggest that the presence of one of the most common parasites, Toxoplasma gondii, can influence the secondary sex ratio in humans.
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105 Citations
Highly Influential Citations
2
Background Citations
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Methods Citations
2
Results Citations
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105 Citations

The relationship between Toxoplasma infection in mothers and offspring gender

A significant relationship was found between chronic Toxoplasma infection and secondary sex ratio and it is suggested that this relationship be investigated in further studies as well as an animal study.

The relation of secondary sex ratio and miscarriage history with Toxoplasma gondii infection

Results of the current study have shown that T. gondii infection affects secondary sex ratio in human offspring and can be addressed as one of the major miscarriage causes in women.

The relationship between Toxoplasma gondii infection in mothers and neonate’s gender

A significant relationship was found between chronic Toxoplasma infection and secondary sex ratio and it is suggested that this relationship be investigated in further studies as well as an animal study.

The effects of toxoplasmosis on sex ratio at birth.

Influence of latent toxoplasmosis on the secondary sex ratio in mice

It is speculated that Toxoplasma can alter the secondary sex ratio of infected females to increase the proportion of (congenitally infected) male offspring, which are the more migratory sex in most rodent species.

The Role of Hormones and Toxoplasma gondii Infection to Change the Secondary Sex Ratio

The secondary sex ratio (SSR) is affected by many factors, including the concentration of hormones and infection with some pathogens such as Toxoplasma gondii, which has an indirect role in SSR.

STUDIES ON THE EFFECT OF INFECTED CASES OF PARASITE TOXOPLASMA GONDII ON SOME SEX HORMONES

It was found that 90 patients who were sent by the specialist to FatimaALZahraa Hospital and IbnALBalady Hospital in Baghdad had antibodies against toxoplasmosis parasite and no significant differences were noticed in the level of prolactin where it registered significant decrease in infected patients in women and men comparison to control subjects.

The influence of latent toxoplasmosis on women's reproductive function: four cross-sectional studies.

The results suggest that 'asymptomatic' latent toxoplasmosis could be a more serious source of fertility problems and health-associated burden than more severe but far rarer congenital toxoplasmsosis.

Environmental exposure of pregnant women to infection with Toxoplasma gondii--state of the art.

On the basis of current literature review, the authors discuss the epidemiological and clinical aspects of toxoplasmosis in pregnant women, the influence of climatic and environmental factors that may lead to an increase in T. gondii infections in humans, particularly in pregnantWomen, and the principles of prophylactics against T. Gondii infection in those women.

The association of latent toxoplasmosis and level of serum testosterone in humans

Comparison of testosterone concentrations and anti-Toxoplasma IgG antibody levels in study and control groups showed that testosterone concentration in study group was higher than that in control group with statistically significant difference.
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43 References

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The latent toxoplasmosis is usually considered to be asymptomatic, however, this paradigm has never been rigorously tested and even its mild symptoms such as the decreased body weight in Toxoplasma-positive pregnant women might in fact indicate an unrecognized serious public health problem.

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SUMMARY Toxoplasma gondii, the coccidian parasite, is known to induce changes in the behaviour of its intermediate hosts. The high prevalence of this parasite in the human population (20–80%) offers…

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This is the first study confirming the existence of such parasite-induced changes in human behaviour that could be considered in evolutionary history of the human species as adaptive from the point of view of parasite transmission.

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A higher viability of XY embryos during the early stages of ontogenesis in man appears to explain their underrepresentation in samples of spontaneously aborted embryos and appears to be the major factor responsible for the deviation of the sex ratio from the theoretically expected value.

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This study shows that the indirect life-cycle parasite T. gondii can influence the activity of its intermediate host the rat, and suggests that this may facilitate its transmission to the cat definitive host.

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: Toxoplasma infection comes from oocysts in cat faeces and from tissue cysts in the flesh of infected animals. It can also be transferred congenitally by trophozoites. Where cats are common, where…

The ecology of toxoplasmosis.

Toxoplasma infection comes from oöcysts in cat faeces and from tissue cysts in the flesh of infected animals. It can also be transferred congenitally by trophozoites. Where cats are common, where…

Fatal attraction in rats infected with Toxoplasma gondii

Although rats have evolved anti–predator avoidance of areas with signs of cat presence, T. gondii's manipulation appears to alter the rat's perception of cat predation risk, in some cases turning their innate aversion into an imprudent attraction.