Pandemic Babies Exhibit Changed Gut Microbiome and Reduced Allergy Rates

Pandemic babies exhibit developmental trajectory of the gut microbiome, influenced by the lockdowns enforced during the COVID-19, pandemic, as per recent investigations conducted by RCSI University of Medicine and Health Sciences, Children’s Health Ireland, and APC Microbiome Ireland (APC), an esteemed SFI Research Centre situated at University College Cork.

The gut microbiome, a complex ecosystem comprising microorganisms residing within our digestive tract, holds pivotal significance for human well-being. The research, featured in Allergy, stands as the inaugural endeavor to delve into the gut health of neonates amid the pandemic. It unveiled notable distinctions in microbiome maturation among infants born during periods of lockdown, contrasting with those born prior to the pandemic era. Furthermore, infants delivered amidst lockdown exhibited diminished occurrences of allergic manifestations, notably food allergies, defying initial expectations.

These revelations underscored the advantageous ramifications for the gut health of “pandemic babies” stemming from the distinctive milieu engendered by lockdown measures, encompassing reduced susceptibility to infections and subsequent antibiotic interventions, alongside prolonged periods of breastfeeding. Notably, these newborns exhibited heightened proportions of beneficial maternal microbes acquired postnatally, which could conceivably confer a protective shield against allergic maladies.

Professor Jonathan Hourihane, Head of the Department of Paediatrics at RCSI, Consultant Paediatrician at Children’s Health Ireland Temple Street, who is joint senior author of the study, commented on the research’s implications: “This study offers a new perspective on the impact of social isolation in early life on the gut microbiome. Notably, the lower allergy rates among newborns during the lockdown could highlight the impact of lifestyle and environmental factors, such as frequent antibiotic use, on the rise of allergic diseases.

“We hope to re-examine these children when they are 5 years old to see if there are longer term impacts of these interesting changes in early gut microbiome.”

Professor Liam O’Mahony, Principal Investigator at APC Microbiome Ireland and Professor of Immunology, at University College Cork is joint senior author. He added: “While we all start life sterile, communities of beneficial microbes that inhabit our gut develop over the first years of life. We took the opportunity to study microbiome development in infants raised during the early COVID-19 era when strict social distancing restrictions were in place, as the complexity of early life exposures was reduced and this facilitated a more accurate identification of the key early life exposures. Prior to this study it has been difficult to fully determine the relative contribution of these multiple environmental exposures and dietary factors on early life microbiome development.

“One fascinating outcome is that due to reduced human exposures and protection from infection, only 17% of infants required an antibiotic by one year of age, which correlated with higher levels of beneficial bacteria such as bifidobacteria. The study has provided a rich repository of data, which we will continue to analyse and investigate in the future.”

Researchers hailing from RCSI, CHI, and APC Microbiome Ireland meticulously examined fecal specimens from 351 infants delivered during the initial three months of the pandemic, juxtaposing them with cohorts born prior to the pandemic’s onset. The former cohort participated in the CORAL (Impact of CoronaVirus Pandemic on Allergic and Autoimmune Dysregulation in Infants Born During Lockdown) project. Methodically administered online surveys gathered data on dietary habits, household environments, and health statuses. Subsequent to the collection of stool samples at 6, 12, and 24 months, allergy assessments were conducted at the 12 and 24-month intervals.

The collaborative endeavor titled “Association between Gut Microbiota Development and Allergy in Infants Born during Pandemic-Related Social Distancing Restrictions” was orchestrated in partnership with esteemed institutions including University College Cork, University of Helsinki, University of Colorado, Karolinska Institute Stockholm, Children’s Health Ireland, Rotunda Hospital, and The Coombe Hospital.

The CORAL study received generous backing from the Temple Street Hospital Foundation in Dublin, Ireland, and the Clemens von Pirquet Foundation in Geneva, Switzerland.

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