Personalized Fever Care Through Temperature-Response Phenotyping

Abstract

Fever is a common clinical manifestation encountered across a broad spectrum of diseases. Traditional approaches to fever management have been generalized, often overlooking individual patient variation in temperature response. Recent advances in temperature-response phenotyping have paved the way for a more personalized approach to fever care, enabling clinicians to tailor interventions based on distinct patient profiles. This review explores the current landscape of personalized fever management, synthesizing evidence from recent studies, discussing underlying mechanisms, and evaluating the implications for clinical practice and medical guidelines.

Introduction

Fever, defined as a regulated elevation of body temperature above the normal daily variation, serves as a hallmark of infection and inflammation. Historically, clinical management has focused on symptomatic relief and identification of underlying etiologies. However, inter-individual variability in fever patterns, underlying host responses, and outcomes have prompted growing interest in temperature-response phenotyping. Personalized fever care seeks to harness this understanding to optimize treatment strategies, improve patient outcomes, and reduce unnecessary interventions.

Epidemiology / Disease Burden

Fever accounts for a substantial proportion of ambulatory and inpatient consultations worldwide. The burden is especially pronounced among pediatric and immunocompromised populations, where fever may signal severe infection or non-infectious inflammatory processes. Epidemiological studies indicate that up to 30% of emergency department visits in children are fever-related, with a similar prevalence in febrile adult admissions. The heterogeneity in fever etiology, duration, and response underscores the need for refined, patient-centric approaches.

Pathophysiology

The pathophysiology of fever involves a complex interplay between exogenous pyrogens, endogenous cytokines, and central thermoregulatory mechanisms. Circulating pyrogens such as bacterial lipopolysaccharides stimulate the release of endogenous mediators, including interleukin-1, interleukin-6, and tumor necrosis factor-alpha. These cytokines act on the hypothalamic preoptic area to elevate the set-point for body temperature through prostaglandin E2 synthesis. Individual differences in genetic predisposition, cytokine response, and neuroendocrine regulation contribute to distinct temperature-response phenotypes, influencing both fever magnitude and recovery trajectory.

Risk Factors

Risk factors for atypical or severe fever responses include age extremes (infancy and elderly), immunosuppression, chronic comorbidities (such as diabetes, renal disease, or malignancy), and genetic polymorphisms affecting cytokine pathways. Recent studies have elucidated the role of single nucleotide polymorphisms (SNPs) in interleukin and prostaglandin genes in modulating fever intensity and duration. Environmental factors, such as access to healthcare and regional pathogen prevalence, further shape the individual fever response.

Clinical Features

The clinical presentation of fever varies widely, from low-grade, transient temperature elevations to high, persistent fevers with systemic inflammatory response. Distinguishing features among temperature-response phenotypes include the rapidity of onset, peak temperature, associated symptoms (rigors, malaise, delirium), and pattern (intermittent, remittent, or sustained). Certain phenotypes, such as hypothermic responses in sepsis or blunted fever in elderly patients, may portend worse outcomes and necessitate heightened clinical vigilance.

Diagnosis

Accurate diagnosis of fever etiology and phenotype requires a structured approach, integrating clinical assessment, laboratory markers, and, where available, molecular profiling. Core temperature measurement remains the gold standard, with continuous or serial monitoring providing valuable data on fever kinetics. Biomarkers such as C-reactive protein, procalcitonin, and cytokine panels aid in distinguishing infectious from non-infectious causes and may help stratify patients according to their temperature-response phenotype. Emerging technologies, including wearable biosensors and artificial intelligence-driven analytics, offer promise for real-time phenotyping and early detection of aberrant temperature responses.

Treatment & Management

Management strategies have traditionally centered on antipyretic therapy (acetaminophen, nonsteroidal anti-inflammatory drugs), physical cooling, and treatment of underlying causes. Personalized fever care advocates for a tailored approach, considering patient-specific factors such as age, comorbidities, and phenotype. For example, aggressive fever suppression may be warranted in patients at risk for febrile seizures or with cardiovascular compromise, while a permissive approach could be beneficial in otherwise healthy adults, leveraging the immunomodulatory benefits of fever. Clinicians must balance symptom relief with the preservation of host defense mechanisms, guided by individual response profiles.

Recent Advances / Emerging Therapies

Advances in precision medicine have catalyzed the development of phenotype-guided fever management protocols. Genomic and proteomic profiling enables identification of high-risk individuals and prediction of fever trajectories. Novel therapeutics targeting specific cytokine pathways, such as interleukin-6 inhibitors, are under investigation for severe hyperinflammatory states. Artificial intelligence applications are being integrated into electronic health records to support real-time, personalized decision-making for fever management. Additionally, patient stratification based on temperature-response patterns is informing the design of clinical trials and guidelines.

Guideline Recommendations

Recent guidelines from major infectious disease and critical care societies increasingly acknowledge the role of personalized approaches in fever management. Key recommendations include routine assessment of patient-specific risk factors, judicious use of antipyretics, and consideration of underlying temperature-response phenotype when devising treatment plans. Guidelines advocate for research into molecular and digital phenotyping tools to support clinical decision-making and call for integration of these advances into standard-of-care protocols as evidence matures.

Conclusion

The paradigm of fever management is shifting toward personalization, driven by advances in temperature-response phenotyping and precision medicine. Clinicians are now equipped to recognize and respond to the heterogeneity of fever manifestations, optimizing interventions to individual patient profiles. Continued research into underlying mechanisms, risk stratification, and integration of emerging technologies will further refine this approach, enhancing patient outcomes and advancing the standard of fever care for diverse clinical populations.