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Early postnatal injections of whole vaccines compared to placebo controls: Differential behavioural outcomes in mice

Abstract : The present study was designed to evaluate the possible effects of the paediatric vaccination schedule in the United States on the central nervous system in a murine model. We compared the impact of treatment with the whole vaccines versus true placebo control. Seventy-six pups were divided into three groups: two vaccinated groups and unvaccinated control. The two vaccinated groups were treated between 7 and 21 post-natal days either with one or three times of the vaccine doses per body weight as used in children between newborn and eighteen months of age. The post-vaccination development, neuromotor behaviours and neurobehavioural abnormalities (NBAs) were evaluated in all mouse groups during the 67 post-natal weeks of mouse age. Mouse body weight was affected only in the vaccinated females compared to males and control. Some NBAs such as decreased sociability, increased anxiety-like behaviours, and alteration of visual-spatial learning and memory were observed in vaccinated male and female mice compared to controls. The present study also shows a slower acquisition of some neonatal reflexes in vaccinated female mice compared to vaccinated males and controls. The observed neurodevelopmental alterations did not show a linear relationship with vaccine dose, suggesting that the single dose gave a saturated response. The outcomes seemed to be sex-dependent and transient with age.
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https://hal-anses.archives-ouvertes.fr/anses-03080307
Contributor : Emmanuelle Chiffoleau <>
Submitted on : Thursday, December 17, 2020 - 4:03:10 PM
Last modification on : Thursday, December 17, 2020 - 4:03:10 PM

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Housam Eidi, Janice Yoo, Suresh Bairwa, Michael Kuo, Eric Sayre, et al.. Early postnatal injections of whole vaccines compared to placebo controls: Differential behavioural outcomes in mice. Journal of Inorganic Biochemistry, Elsevier, 2020, 212, pp.111200. ⟨10.1016/j.jinorgbio.2020.111200⟩. ⟨anses-03080307⟩

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