Can the human gut microbiome help fight drug-resistant typhoid?
The human gastrointestinal tract contains trillions of microorganisms, which form our gut microbiome. The gut microbiome is established during infancy and evolves with diet and environmental factors as we grow. This complex ecosystem profoundly affects our health in both health and disease, shaping the relationship between the gut microbiome and immunity.[1]
As antibiotic resistance grows worldwide, drug-resistant typhoid fever becomes harder to treat effectively. Research shows that typhoid patients are prone to losing their protective gut bacteria, highlighting the link between the gut microbiome and typhoid.[3] Chronic carriers develop bacteriophages (viruses that infect bacteria) in their gut microbiome, which enhance typhoid survival.[4] Could the microorganisms in our intestines offer new hope?
Understanding drug-resistant typhoid
Antibiotics are the primary treatment for typhoid fever, yet the rise of antimicrobial resistance threatens this. India is witnessing a rise in antimicrobial resistant typhoid, with strains showing resistance to commonly used antimicrobials such as ceftriaxone and azithromycin.[7]
Studies show that approximately 10% of typhoid patients continue to shed the bacteria Salmonella typhi after completing the treatment, despite not showing any symptoms.[5] Such carriers can exhibit gut dysbiosis, or an imbalance in gut bacteria with fewer beneficial microbes, as microbial diversity drops significantly. This demonstrates how the microbiome and typhoid infection are closely linked. Imbalanced gut bacteria can damage the gut lining and spread antibiotic resistance through viruses, highlighting the role of gut bacteria in infections.[4] Even last-resort antibiotics are failing due to rising antimicrobial resistance, creating a growing global healthcare burden.[6]
What is the human gut microbiome?
The human gut microbiome comprises trillions of microorganisms, namely Firmicutes, Bacteroidetes, Actinobacteria and Proteobacteria, that live in our digestive tract. These microorganisms help digest food, produce vitamins, and protect against harmful pathogens.[1] A healthy gut microbiome maintains high microbial diversity with abundant Lactobacillus and Bifidobacterium that produce protective short-chain fatty acids.[2,4] This balance is essential to understanding the connection between gut bacteria and typhoid, as typhoid disrupts this equilibrium.[2]
How the gut microbiome may help fight typhoid
Preventing pathogen growth
In a healthy body, the good gut bacteria make it difficult for pathogens (disease-carrying bacteria, viruses, fungi and parasites) to enter. This natural protection is called colonisation resistance.[2] The bacteria Enterococcus faecium produce substances in our gut that break the typhoid bacteria apart.[6]
Strengthening immune defences
Good bacteria train the immune system and play a key role in the gut microbiome and immunity. They help make IgA antibodies that stop typhoid germs. Without them, your gut defence weakens.[6] The short-chain fatty acids (SCFAs) made in the gut boost immune cells that find and destroy pathogens better.[3] Good bacteria compete with harmful microbes to stop diseases like typhoid from spreading. In certain studies, patients with typhoid fever showed a functional disruption in their gut microbiota, compared to healthy people.[2] This highlights the strong relationship between gut health and immune system function.
Supporting the gut barrier
The gut bacteria Firmicutes help maintain a protective mucus barrier in your intestines, which blocks pathogens, including typhoid germs, from entering your body.[2,3] The SCFAs help control immune responses and keep the gut barrier strong in the intestines and ileum (the last part of the small intestine that absorbs vitamin B12, bile salts, and remaining nutrients).[2] Bacteriocins, natural, protein-based weapons produced by bacteria to kill or inhibit competing, closely related bacterial strains, have been shown to kill harmful germs, reinforcing the connection between gut microbiome and typhoid.[6]
Protecting gut health to support overall immunity
Typhoid fever induces lasting disruption of the gut microbiota that can persist even after the patient recovers. It can compromise the long-term colonisation resistance and immune surveillance of the body.[2] An imbalance in the gut microbiome (where the harmful bacteria outnumber the good bacteria) can cause bacteriophages (viruses that attack bacteria) to pick up antibiotic resistant genes from dead bacteria and inject them into your helpful gut bacteria.[4] The good bacteria in our gut produce bacteriocins (natural antibiotics) that keep killing any leftover typhoid germs hiding in your gut, strengthening the link between gut health and immune system resilience.[6]
To keep your gut healthy, eat foods such as curd, kombucha, kefir, and other fermented dishes. These fermented foods can replace the Lactobacillus and Bifidobacterium that typhoid wipes out from your gut.[2,4]
Conclusion
In the face of rising drug-resistant typhoid, the human gut microbiome offers promising insights into how the body can naturally defend itself. A healthy gut microbiome can limit the growth of pathogens, strengthen immune responses and maintain the gut barrier. While maintaining good gut health through diet can complement overall protection, it is not a substitute for proven medical prevention. Typhoid vaccination remains the most effective way to protect against typhoid. Consult a doctor and ensure you and your family are appropriately vaccinated.
FAQs
What is drug-resistant typhoid?
Drug-resistant typhoid is an infection caused by Salmonella typhi that no longer responds to commonly used antibiotics, making treatment difficult.
How does the gut microbiome affect infections?
The gut microbiome supports immunity, blocks harmful pathogens, and maintains gut health, reducing infection risk and helping the body respond effectively.
Can probiotics prevent typhoid?
Probiotics may support gut health and immunity but cannot prevent typhoid. Vaccination, safe water, and hygiene remain essential preventive measures.
Why is antimicrobial resistance a concern in typhoid?
Antimicrobial resistance reduces treatment effectiveness, prolongs illness, increases complications and makes typhoid harder to control, posing a serious public health threat.
What are the best ways to prevent typhoid?
Vaccination, safe drinking water, proper sanitation, hand hygiene and avoiding contaminated food are the most effective ways to prevent typhoid infection.
Resources
- https://pmc.ncbi.nlm.nih.gov/articles/PMC5433529/
- Haak, et al. (2020). Altered patterns of compositional and functional disruption of the gut microbiota in typhoid fever and nontyphoidal febrile illness. Open Forum Infectious Diseases
- Ashton, et al. (2025). Interplay between the gut microbiome and typhoid fever: insights from endemic countries and a controlled human infection model. Microbiome
- Mehdi, S., & Hayat, M. (2023). Role of intestinal microbiota in persistent typhoid carriers. Journal of Healthcare Systems and Innovations
- Okyere, et al. (2025). Risk Factors for Typhoid Fever: Systematic Review. JMIR Public Health and Surveillance
- Jin, H., et al. (2025). Human gut microbiota-derived antimicrobials against Salmonella Typhi: diversity, mechanisms, and therapeutic potential. Archives of Microbiology
- https://pmc.ncbi.nlm.nih.gov/articles/PMC6563740/
Disclaimer: A public awareness initiative by Bharat Biotech International Limited. This information is for general awareness only and does not constitute medical advice. The doctors, medical facilities and graphics shown are for illustrative purposes only. For any medical advice or any question or concern you may have regarding your condition, consult your doctor.