Viridans Streptococcal Infections in Neutropenic Cancer Patients

Viridans group streptococci are commensal organisms of the oropharynx and gastrointestinal tract that emerge as opportunistic pathogens in patients with neutropenia induced by cytotoxic chemotherapy. Disruption of mucosal barriers, profound neutrophil depletion and alterations in host microbiota enable translocation of these organisms into the bloodstream, leading to bacteremia and, in severe cases, sepsis. The incidence of viridans streptococcal infections varies with chemotherapy regimen, underlying malignancy and patient age, with especially high rates reported in acute leukaemias and in paediatric populations undergoing high-intensity induction protocols.

Clinical presentation spans from mild febrile neutropenia to fulminant shock, often complicated by acute respiratory distress and multiorgan failure. Empirical broad-spectrum antimicrobial therapy remains the cornerstone of management, with vancomycin frequently employed to cover penicillin-resistant strains. Prevention strategies focus on risk stratification, judicious use of prophylactic antibiotics and modulation of the mucosal barrier by oral care protocols. Despite advances in supportive care, viridans streptococcal bacteremia continues to contribute significantly to morbidity and mortality in this vulnerable cohort, highlighting the need for refined diagnostic tools and tailored therapeutic regimens.

Research from Nature Portfolio

Recent studies have illuminated the heightened risk of viridans streptococcal bacteremia in specific paediatric cohorts, notably those with high-risk neuroblastoma undergoing induction chemotherapy. Analysis of a large single-centre series demonstrated that these patients exhibit rates of bloodstream infection comparable to those seen in acute myelogenous leukaemia, despite the absence of cytosine arabinoside in treatment protocols. Findings underscore the importance of vigilant monitoring and early intensive care interventions to mitigate progression to critical illness.

Viridans Streptococcal Infections in Neutropenic Cancer Patients publication trend

The graph below shows the total number of articles in viridans streptococcal infections in neutropenic cancer patients across all publications each year (not limited to Nature Index journals).

Technical terms

Neutropenia: A reduction in circulating neutrophils below 1.5 × 10^9 cells L^−1, compromising innate immunity.

Febrile neutropenia: The onset of fever in the context of neutropenia, often the first indicator of systemic infection.

Bacteremia: The presence of bacteria in the bloodstream, detectable by blood culture.

Viridans Group Streptococci: A heterogeneous assemblage of alpha-haemolytic streptococcal species that are normal flora of the mouth and gastrointestinal tract but can cause invasive disease in immunocompromised hosts.

Viridans Group Streptococcal Shock Syndrome: A fulminant form of infection characterised by rapid onset of hypotension, respiratory distress and multiorgan dysfunction in neutropenic patients.

References

1. High frequency of viridians group streptococci bacteremia in pediatric neuroblastoma high-risk patients during induction chemotherapy. Scientific Reports (2023).
2. Viridans Group Streptococcal Infections in Children After Chemotherapy or Stem Cell Transplantation. Medicine (2016).