The Fascinating Interplay Between H. pylori and Candida

Science Based

Our minds tend to look for simple answers. When it comes to health problems, we want a clear diagnosis and a straightforward plan that will quickly make us feel better.

But the more I read about the microbiota, the more I realise how complicated it really is. With so many species of bacteria, fungi and viruses living together, they can interact with each other in incredibly complex ways.

Recently, I came across a surprising claim that Candida can help H. pylori to survive in the gut. Since both can have a negative impact on the digestive tract and both are notoriously difficult to treat, I decided to look into what the research says.

A Safe House for H. pylori

This first article reveals a fascinating detail that almost never comes up in gut health discussions: H. pylori can actually hide inside structures in Candida called vacuoles.

Once inside Candida, H. pylori may be protected from substances that would normally kill it, including antibiotics.

It may be one reason why H. pylori infection returns so quickly after treatment.

The intravacuolar H. pylori inside Candida albicans were protected from environmental stress and antibiotics such as amoxicillin, and once unfavorable conditions subsided, the H. pylori were released. It was noticed as urease activity on urea-based agar and further detected by PCR. The released bacterium was able to facilitate its entry into new target cells and cause inflammation in the gastric environment.

What's in it for Candida?

If Candida gives H. pylori a safe place to hide until the environment becomes more favourable, what does Candida get in return?

By the way, I find it fascinating to learn how these microbes can influence each other.

I guess it won't come as a surprise that Candida becomes more tolerant to stress and potentially more pathogenic.

The presence of H. pylori could therefore make Candida better at invading and damaging tissue.

This suggests that H. pylori may reconfigure the metabolic network of C. albicans, redirecting energy resources and stress response strategies to maintain growth advantage under competitive or symbiotic conditions. Such metabolic reprogramming could represent an adaptive strategy evolved by the fungus to sustain or even enhance its pathogenic potential during cohabitation with bacteria.

In other words, Candida became more resistant to antifungal treatment and more likely to form invasive hyphae.

Co-culture with H. pylori S7 and C. albicans SC5314 yielded Hp-positive C. albicans CacoHp. Compared with the parental strain SC5314, CacoHp exhibited increased tolerance to antifungal agents, sodium dodecyl sulfate, and H2O2; enhanced inhibition of GES-1 cell proliferation; elevated aspartic protease secretion; and increased hyphal formation.

Nutrient Deficiencies

Another study adds an interesting piece to the puzzle.

When nutrients become scarce, stressed H. pylori is more likely to enter Candida cells.

But if Candida is severely starved as well, it may be less able to take in or harbour H. pylori.

The Bottom Line

What an insight!

What if trying to kill these microbes is not the best approach? They can become resistant to antibiotics and antifungals, and they may also work together to survive harsh conditions until things improve.

Here's a quote from another research article:

Candida may provide a protective microenvironment against bactericidal agents, which could, in part, explain cases of treatment failure and recurrence. Moreover, after internalization by Candida, H. pylori may retain its metabolic activity and with the potential continue to produce toxic metabolites, leading to chronic damage to the gastric mucosa.