Women infected with parasite Toxoplasma have more sons

@article{Kakov2006WomenIW,
  title={Women infected with parasite Toxoplasma have more sons},
  author={{\vS}{\'a}rka Kaňkov{\'a} and Jan Sulc and K. Nouzov{\'a} and Karel Fajfrlík and Daniel Frynta and Jaroslav Flegr},
  journal={Naturwissenschaften},
  year={2006},
  volume={94},
  pages={122-127}
}
The boy-to-girl ratio at birth (secondary sex ratio) is around 0.51 in most populations. The sex ratio varies between societies and may be influenced by many factors, such as stress and immunosuppression, age, primiparity, the sex of the preceding siblings and the socioeconomic status of the parents. As parasite infection affects many immunological and physiological parameters of the host, we analyzed the effect of latent toxoplasmosis on sex ratios in humans. Clinical records of 1,803 infants… 
The relation of secondary sex ratio and miscarriage history with Toxoplasma gondii infection
TLDR
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.
TLDR
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.
TLDR
The effect of prevalence of toxoplasmosis on a nationwide sex ratio was the third strongest effect from the effects of 15 factors included in the analysis, and it has been suggested that toxoplasma-associated concentration of steroid hormones or glucose may be the proximal cause in the sex ratio shift.
Influence of latent toxoplasmosis on the secondary sex ratio in mice
TLDR
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.
STUDIES ON THE EFFECT OF INFECTED CASES OF PARASITE TOXOPLASMA GONDII ON SOME SEX HORMONES
Toxoplasmosis is considered to be an epidemic disease which spreads very widely all over the world. The cause of it is the infection by the parasite Toxoplasma gondii. Its spread depends on the
The influence of latent toxoplasmosis on women's reproductive function: four cross-sectional studies.
TLDR
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.
TLDR
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.
Do differences in Toxoplasma prevalence influence global variation in secondary sex ratio? Preliminary ecological regression study
TLDR
The preliminary results suggest that Toxoplasma gondii infection could be one of the most important environmental factors influencing the global variation of offspring sex ratio in humans.
The association of latent toxoplasmosis and level of serum testosterone in humans
TLDR
Testosterone concentration in study group was higher than that in control group with statistically significant difference, and significant differences were found in testosterone concentrations and anti-Toxoplasma IgG antibody levels in study and control groups.
Potential immunomodulatory effects of latent toxoplasmosis in humans
TLDR
Latent toxoplasmosis has immunomodulatory effects in human and probably protects men against some classes of immunopathological diseases.
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References

SHOWING 1-10 OF 45 REFERENCES
Influence of latent 'asymptomatic' toxoplasmosis on body weight of pregnant women.
TLDR
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.
Impact of the sex of first child on the prognosis in secondary recurrent miscarriage.
TLDR
A male first-born seems to be associated with a less favourable reproductive potential among women with secondary RM, and maternal immunization against HY antigens may be responsible for these findings.
Induction of changes in human behaviour by the parasitic protozoan Toxoplasma gondii.
TLDR
Whether toxoplasmosis induces personality factor-shifts or whether certain combinations of personality factors influence the probability of acquiring Toxoplasma infection, is examined using the personality profiles of 164 male patients diagnosed with acute toxoplasms during the past 13 years.
Increased risk of traffic accidents in subjects with latent toxoplasmosis: a retrospective case-control study
TLDR
The results suggest that 'asymptomatic' acquired toxoplasmosis might in fact represent a serious and highly underestimated public health problem, as well as an economic problem.
Toxoplasma gondii: from animals to humans.
TLDR
Recent epidemiological data on T. gondii, hypotheses on the major routes of transmission to humans in different populations, and preventive measures that may reduce the risk of contracting a primary infection during pregnancy are presented.
Decrease of psychomotor performance in subjects with latent ‘asymptomatic’ toxoplasmosis
TLDR
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.
[Sex ratio in early embryonal mortality in man].
TLDR
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.
The effect of Toxoplasma gondii and other parasites on activity levels in wild and hybrid Rattus norvegicus.
TLDR
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.
The ecology of toxoplasmosis.
: 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
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