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  • Iron deficiency during...

Iron deficiency during infancy reduces vaccine efficacy, find Studies

Written By : Hina Zahid |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2020-07-30T06:15:35+05:30  |  Updated On 30 July 2020 9:53 AM IST
Iron deficiency during infancy reduces vaccine efficacy, find Studies
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Iron deficiency may impair adaptive immunity and is common among African infants at time of vaccination. Whether iron deficiency impairs vaccine response and whether iron supplementation improves humoral vaccine response is uncertain.

Researchers have found in two clinical studies that iron deficiency during infancy may reduce the protection that vaccinations provide. In their first study, the research group led by Michael Zimmermann from the Department of Health Sciences and Technology worked in collaboration with scientists from Kenya, the UK, the Netherlands and the US. Their aim was to determine the levels of body iron and antibodies against antigens from the administered vaccines in blood samples of 303 Kenyan children followed from birth to age 18 months.

"In Switzerland, babies are born with iron stores that are normally sufficient for their first six months of life," says Zimmermann, Professor of Human Nutrition. "But in Kenya and other sub-?Saharan countries, iron reserves in babies are much lower, especially in those born to anaemic mothers or with a low birth weight." This is aggravated by infections and bloody diarrhoea, and their iron reserves are often exhausted after two to three months, he explains.

More than twice the risk

The study showed that more than half the children were already suffering from anaemia at the age of 10 weeks, and by 24 weeks, more than 90 percent had low haemoglobin and red blood cell counts. Using statistical analyses, the researchers, led by Zimmerman, were able to show the following: despite several vaccinations, the risk of finding a lack of protective antibodies against diphtheria, pneumococci and other pathogens in the blood of 18-?month-olds was more than twice as high in anaemic infants compared to those who were not anaemic.

In a second study, the researchers administered a powder containing micronutrients to 127 infants slightly over six months old on a daily basis for four months. In 85 of these children, the powder also contained iron; the other 42 children received no iron supplement. When the children were vaccinated against measles at the age of nine months - as stipulated by the Kenyan vaccination schedule - those children who also received iron as a dietary supplement developed a stronger immune response in two respects: not only did they have more measles antibodies in their blood at the age of 12 months, but their antibodies were also better at recognising the pathogens.

Iron as a dietary supplement to stave off anaemia

The World Health Organization (WHO) recommends feeding infants exclusively with breastmilk for the first six months to avoid infection with diseases transmitted in contaminated water. For that reason, Zimmermann and his research team did not give the children the dietary supplement powder until they were seven months old, although most of the vaccinations had generally been administered by this point; the measles vaccination was the only exception.

However, Zimmermann says that many places have made great progress with their water supply and health systems in recent years, which is why discussions in professional circles about updating the WHO's recommendation are becoming ever more important. He believes that adapting the recommendation would be a good move because preventing anaemia in young children by supplementing the iron in their diet would improve the protection provided by other vaccinations. In turn, this may help to prevent many of the 1.5 million annual deaths due to vaccine-?preventable diseases.

For more details click on the link: http://dx.doi.org/10.3389/fimmu.2020.01313

Iron deficiencyinfancyanaemiafrontiers in immunologyVaccine efficacy
Source : Frontiers in Immunology
Hina Zahid
Hina Zahid

    Hina Zahid Joined Medical Dialogue in 2017 with a passion to work as a Reporter. She coordinates with various national and international journals and association and covers all the stories related to Medical guidelines, Medical Journals, rare medical surgeries as well as all the updates in the medical field. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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