Mpox (Monkeypox) Infection: Changing Clinical Presentations, Diagnostic Challenges, and Public Health Implications — A Case Study

Abstract

Mpox (formerly monkeypox) is a re-emerging zoonotic viral disease that has gained global attention due to recent outbreaks characterized by atypical clinical presentations and sustained human-to-human transmission. While historically considered a self-limiting illness with characteristic rash and lymphadenopathy, recent cases have demonstrated variable symptomatology, posing diagnostic and public health challenges. We report the case of a 34-year-old male presenting with fever and localized cutaneous lesions without classical prodromal features, highlighting evolving clinical patterns, diagnostic evaluation, and management. This case underscores the importance of heightened clinical suspicion, timely laboratory confirmation, and robust public health surveillance to limit transmission and improve outcomes.

Introduction

Mpox is caused by the Mpox virus, a double-stranded DNA virus belonging to the Orthopoxvirus genus. Traditionally endemic to Central and West Africa, Mpox has emerged globally in recent years, with outbreaks reported across multiple continents [1]. Unlike earlier outbreaks, recent cases have shown atypical features, including mild or absent prodromal symptoms, localized genital or perianal lesions, and delayed presentation to healthcare facilities [2].

These evolving presentations complicate early recognition and raise concerns regarding underdiagnosis and community transmission. Accurate diagnosis, appropriate isolation, and contact tracing are essential components of outbreak control. This case study illustrates the diagnostic challenges and broader public health implications associated with contemporary Mpox infection.

Case Report

Patient Information

• Age / Gender: 34-year-old male

• Occupation: Sales executive

• Medical History: No known chronic illnesses

• Travel History: No recent international travel

• Exposure History: Close physical contact with a symptomatic individual

• Chief Complaints: Fever and localized skin lesions for 4 days

Clinical Findings

The patient presented with low-grade fever, malaise, and painful vesiculopustular lesions over the genital and inner thigh region. Notably, there was no preceding upper respiratory symptomatology or widespread rash. Physical examination revealed multiple well-circumscribed, umbilicated lesions at varying stages of evolution. Tender inguinal lymphadenopathy was present. No oral lesions or systemic signs of severe illness were observed.

Timeline

The patient developed low-grade fever and fatigue approximately four days prior to presentation. Within 24 hours, localized vesicular lesions appeared in the genital region, prompting medical consultation. Diagnostic testing was initiated on the day of presentation, and supportive management commenced following clinical suspicion. Laboratory confirmation was obtained within one week, and lesions resolved gradually over the subsequent three weeks without complications.

Diagnostic Assessment

Initial laboratory investigations, including complete blood count and inflammatory markers, were within normal limits. Differential diagnoses included herpes simplex virus infection, varicella-zoster virus infection, and bacterial skin infections. Swab samples from skin lesions were sent for real-time polymerase chain reaction (RT-PCR), which confirmed Mpox virus infection.

Serological testing for HIV and other sexually transmitted infections was negative. The diagnosis was established based on clinical presentation and molecular confirmation, emphasizing the role of targeted virological testing in atypical cases.

Diagnosis

Confirmed Mpox (Monkeypox) virus infection with atypical localized cutaneous presentation represents an increasingly recognized clinical scenario in recent outbreaks and poses significant diagnostic and public health challenges. Traditionally, Mpox was characterized by a prodromal phase of fever, malaise, and lymphadenopathy followed by a generalized vesiculopustular rash. However, contemporary cases frequently demonstrate limited lesion distribution, often confined to the genital, perianal, or inner thigh regions, and may occur in the absence of prominent systemic symptoms. This atypical presentation increases the likelihood of misdiagnosis as common sexually transmitted infections, bacterial skin conditions, or viral exanthems, potentially delaying appropriate isolation and infection control measures.

Laboratory confirmation through polymerase chain reaction testing of lesion samples remains essential for accurate diagnosis, particularly in cases with non-classical features. Early identification allows for timely implementation of isolation protocols, appropriate patient counseling, and notification of public health authorities, thereby reducing the risk of onward transmission. From a clinical perspective, recognizing atypical Mpox presentations is crucial to ensuring appropriate management and monitoring for potential complications, especially in individuals with underlying immunosuppression or comorbidities. This evolving clinical spectrum underscores the need for continued clinician education, updated diagnostic algorithms, and strengthened surveillance systems to effectively respond to current and future Mpox outbreaks.

Therapeutic Intervention

The patient was managed conservatively with isolation, symptomatic treatment including antipyretics and analgesics, and local skin care. Antiviral therapy was not initiated due to mild disease severity and absence of risk factors for severe illness. The patient was counseled regarding infection control measures, avoidance of close contact, and monitoring for symptom progression.

Public health authorities were notified, and contact tracing was initiated in accordance with national guidelines.

Follow-Up and Outcomes

The patient remained clinically stable throughout the course of illness. Cutaneous lesions crusted and healed over a three-week period without secondary infection or scarring. No new lesions developed, and systemic symptoms resolved within one week. At follow-up, the patient had fully recovered and resumed normal activities after completing the recommended isolation period.

Discussion

Recent Mpox outbreaks have demonstrated a shift in epidemiological and clinical patterns, with increased human-to-human transmission and atypical presentations that diverge from classical descriptions [3]. Limited lesion distribution, absence of prodromal symptoms, and overlap with sexually transmitted infections contribute to diagnostic delays.

Early recognition is essential not only for individual patient care but also for preventing onward transmission. Molecular diagnostics, particularly RT-PCR testing of lesion samples, remain the gold standard for confirmation. This case highlights the need for clinician awareness, updated diagnostic algorithms, and integration of Mpox surveillance into routine infectious disease practice.

Conclusion

Mpox infection continues to evolve in its clinical presentation and epidemiology, presenting significant diagnostic and public health challenges for healthcare systems worldwide. Unlike earlier outbreaks characterized by a well-defined prodromal phase followed by a generalized vesiculopustular rash, recent cases increasingly demonstrate atypical, localized manifestations that may mimic common dermatological or sexually transmitted infections. These evolving patterns can delay diagnosis, increase the risk of unrecognized transmission, and complicate outbreak containment efforts, particularly in non-endemic regions where clinician familiarity with the disease may be limited.

This case demonstrates that Mpox can present without classical systemic symptoms such as high-grade fever or widespread lymphadenopathy, underscoring the importance of maintaining a high index of suspicion in patients presenting with unexplained vesiculopustular lesions. Early clinical recognition, supported by timely molecular diagnostic testing, is essential to differentiate Mpox from other infectious and noninfectious conditions and to guide appropriate management. Failure to promptly identify cases may result in continued community spread, especially in settings involving close physical contact.

Beyond individual patient care, coordinated public health responses remain central to controlling transmission. Prompt case notification, isolation, contact tracing, and risk communication are critical components of outbreak mitigation. Public awareness campaigns and targeted education of healthcare professionals are equally important to improve early detection and reduce stigma associated with the disease. In addition, strengthening surveillance systems and integrating Mpox monitoring into routine infectious disease frameworks will be vital to responding effectively to future outbreaks. Collectively, these measures are essential to limiting transmission, reducing healthcare burden, and mitigating the broader societal impact of Mpox infection.

References

1. Adler H, et al. Clinical features and management of human monkeypox. Lancet Infect Dis. 2022;22(8):1153–1162.

2. Thornhill JP, et al. Monkeypox virus infection in humans across multiple countries. N Engl J Med. 2022;387(8):679–691.

3. Patel A, et al. Clinical features and novel presentations of monkeypox. BMJ. 2022;378:e071593.

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