Urine lipoarabinomannan for rapid tuberculosis diagnosis in HIV-infected adult outpatients in Khayelitsha

HIV and Associated TB: A Lethal Association for Kidney Health?

Human immunodeficiency virus (HIV) and tuberculosis (TB) are the leading infectious causes of death globally. The combined brunt of these diseases is experienced mainly in low-income and lower-middle-income countries. HIV/TB have devastating effects on the kidneys, leading to accelerated decline of kidney function as well as mortality. Managing the triad of TB/HIV and kidney disease is challenging. We discuss the epidemiology of HIV/TB coinfection and the kidney and the key mechanisms of kidney disease including genetic susceptibility. The clinical presentation and pathology, as well as the challenges of diagnosing CKD in these patients, also are discussed. The strategies to prevent and manage HIV/TB-related kidney disease such as proper assessment, avoiding nephrotoxic regimens, drug dose adjustments, kidney function monitoring, avoidance of drug-drug interactions, and other interventions are explored. We also briefly discuss the complexities around HIV/TB patients on dialysis and kidney transplantation. HIV/TB coinfection presents an increased risk for kidney-related morbidity and mortality; patients with this triad need to be given special consideration for future research and management.

Alere Determine-tuberculosis lipoarabinomannan positivity in disseminated non-tuberculous mycobacteria: An illustrative case series

Introduction

In outpatients, the World Health Organization recommends that the urine Alere Determine-tuberculosis lipoarabinomannan (AlereLAM) should be used to support the diagnosis of tuberculosis (TB) in people living with HIV (PLHIV) with CD4 counts ≤ 100 cells/µL or with signs of being ‘seriously ill’. There is a risk of a false-positive AlereLAM in disseminated non-tuberculous mycobacterial (NTM) infections and it may be difficult to differentiate a single infection (either Mycobacterium tuberculosis or NTM) from dual infection.

Patient presentation

We report three patients, enrolled in an operational study assessing AlereLAM use in an outpatient setting, who had advanced HIV (all CD4 < 20 cells/µL) and strongly positive (grade 4+) AlereLAM results in whom Mycobacterium avium or kansasii were later cultured from blood or urine and sputum.

Management and outcome

Based on positive AlereLAM results, all three were initiated on TB treatment. One died before NTM infection was detected. Two were managed for dual infection (TB and NTM) but died within two years.

Conclusion

Tuberculosis remains a leading cause of death and a disproportionate number of these deaths occur in PLHIV. Tuberculous treatment should be initiated based on a positive AlereLAM result, and this should be followed by additional testing to confirm the diagnosis of TB and to obtain drug susceptibility results. In those not responding to TB treatment where the only positive result was an AlereLAM, an alternative or additional diagnosis of NTM infection should be considered, particularly in patients with a very low CD4 count.