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Common newborn treatment may quietly weaken your baby’s vaccines, new study warns

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A groundbreaking study has revealed a surprising and potentially concerning link between a routine medical treatment in newborns and their long-term immune response.

When newborns face infections, doctors don’t hesitate to prescribe antibiotics — and with good reason.

Early-life infections can turn severe quickly, and antibiotics are a trusted line of defense.

But a new Australian study has raised an important question: Could this life-saving intervention come at a hidden cost?

Tracking 191 healthy babies from birth, researchers observed how antibiotic exposure in the first weeks of life influenced their responses to routine vaccinations at 7 and 15 months.

What they found wasn’t immediately obvious — but gradually, a pattern emerged. And it had everything to do with the unseen world inside our guts.

The gut bacteria that help vaccines work

Our gut microbiome is home to trillions of bacteria that do far more than just help us digest food.

In infants, one group of bacteria — Bifidobacterium — appears to play a critical role in how the immune system develops and reacts to vaccines.

The study found that newborns who received direct antibiotic treatment had significantly lower levels of this beneficial bacteria.

This decrease in Bifidobacterium was directly linked to weaker antibody responses to key vaccines, including those protecting against pneumococcus and Haemophilus influenzae type b.

Even tests on mice confirmed it: when Bifidobacterium was present, vaccine responses improved. When it was missing, the immune system lagged behind.

Should parents be worried?

Not necessarily. The researchers behind the study stress that antibiotics remain essential, especially in serious neonatal infections.

Most babies in the study still developed what’s considered a protective level of antibodies.

But there’s a catch — for those given antibiotics early on, those responses seemed to fade faster over time.

This has sparked a new clinical trial, where scientists will investigate whether giving a probiotic containing Bifidobacterium after antibiotic treatment can help restore optimal immune function.

If successful, the solution could be simple — and powerful: a targeted probiotic to protect vaccine responses in our most vulnerable.

This article is based on information from The Guardian.

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