Kidney Health Alert: How Reduced Function Increases Your Risk of Infections
"A new study reveals the critical link between declining kidney function and a heightened susceptibility to common infections. Discover how to protect yourself and stay healthy."
Chronic Kidney Disease (CKD) is a widespread health concern, affecting approximately 5% to 15% of adults in developed countries. Beyond the well-known risks of heart disease and other complications, a growing body of research highlights a significant connection between CKD and an increased vulnerability to infections. These infections not only diminish overall quality of life but also contribute to higher healthcare costs and potentially life-threatening situations.
A groundbreaking study, published in the Clinical Journal of the American Society of Nephrology, sheds light on this critical relationship. Researchers investigated a large population, examining the link between estimated glomerular filtration rate (eGFR) – a measure of kidney function – and the incidence of various community-acquired infections. The findings reveal a concerning trend: as kidney function declines, the risk of infections rises substantially.
This article breaks down the study's key findings, explaining what they mean for your health. We'll explore which types of infections are most common in individuals with reduced kidney function, and, more importantly, what steps you can take to protect yourself and maintain a healthy lifestyle. Whether you have CKD, know someone who does, or simply want to be proactive about your well-being, this information is vital.
The eGFR-Infection Connection: What the Research Shows
The study analyzed data from over 1.1 million health care users in Stockholm, Sweden, tracked over a 12-month period. Researchers meticulously examined the relationship between eGFR levels and the occurrence of community-acquired infections, excluding hospital-acquired infections to ensure accurate results. The findings paint a clear picture: lower eGFR is significantly associated with a higher risk of infections.
- For individuals with an eGFR of 90-104 ml/min per 1.73 m² (considered a normal range), the incidence rate of infections was 74 per 1000 person-years.
- However, for those with an eGFR below 30 ml/min per 1.73 m² (indicating severe kidney disease), the incidence rate soared to 419 per 1000 person-years.
- This translates to a 1.53 times higher risk of community-acquired infections for individuals with severely reduced kidney function compared to those with normal kidney function.
Recent Evidence on Infection Risk
A systematic review reported that nearly all examined studies found an increased risk of sepsis among people with chronic kidney disease (CKD). It also found that sepsis risk progressively increased as estimated glomerular filtration rate (eGFR) declined. Separately, data from 1,139,470 health care users in the Stockholm CREAtinine Measurements Project indicated that patients with CKD and eGFR below 90 mL/min per 1.73 m2 had a 25% higher incidence of respiratory tract infection than people with normal kidney function.
Limits of Current Evidence
The Stockholm CREAtinine Measurements Project recorded 106,807 infections across 1,128,313 person-years among 1,139,470 health care users, providing a large observational evidence base. However, the cited research notes that earlier studies used populations that were not representative of the general population, varied in their definitions of CKD and sepsis, and often had short follow-up periods. Another review emphasizes that identifying individual factors that promote infectious episodes is important because infections may accelerate progression toward end-stage kidney disease.
Age and Infection Patterns
Research from Benin City, Nigeria, found that the prevalence of lower respiratory tract infections increased significantly with age, with patients aged 71 years and older having the highest prevalence. A separate study of children concluded that viruses are important causes of lower respiratory tract infections, particularly Respiratory Syncytial Virus and Parainfluenza Virus type 3. These findings show that respiratory infection patterns can differ substantially by age group and by the organisms involved.
Taking Control: Protecting Your Health
The findings of this study underscore the importance of proactive kidney health management. While reduced kidney function can increase the risk of infections, there are steps you can take to mitigate this risk. Regular check-ups with your doctor, including eGFR monitoring, are essential for early detection and management of CKD. If you have CKD, work closely with your healthcare team to develop a personalized plan that includes strategies for preventing infections, such as vaccinations and lifestyle modifications.
Emerging Prevention Strategies
A Nature Index summary reports that patients who experienced a serious infection during advanced CKD had a 30–35% higher risk of all-cause mortality during the first year after starting dialysis. Research on CKD also links gut dysbiosis with uremic toxin accumulation, systemic inflammation, and disrupted immune homeostasis. Proposed prevention strategies include early kidney-disease screening, improved hygiene, careful antibiotic use, vaccines, natural antimicrobial agents, and lifestyle changes.
Immune Dysfunction Across CKD
Chronic kidney disease can impair normal innate and adaptive immune responses, predisposing patients to infections, virus-associated cancers, and weaker vaccine responses. Infectious disease is recognized as an important complication of end-stage renal disease and contributes to excess morbidity and health care costs. Epidemiological studies also indicate that mild to moderate CKD substantially increases infection risk, not only end-stage disease.
Infection Burden in Practice
Advanced CKD and end-stage renal disease requiring renal replacement therapy are associated with a marked increase in all-cause and cardiovascular morbidity and mortality. A 2024 study identifies CKD, defined as abnormalities in kidney structure or function, as a potential risk factor for sepsis and emphasizes the importance of identifying targetable risk factors for better disease risk stratification. Current research is also examining the real-world risk of symptomatic urinary tract infections among patients with cardiometabolic and kidney diseases who use SGLT2 inhibitors.