Peer Reviewed

Photoclinic

Bed Bugs in Clinical Settings: Case Report and Literature Review

Authors:
Jordan N. Edwards, BS
Department of Biochemistry, University of Florida, Gainesville, Florida

James D. Denham, MS, MS-III
University of South Florida Morsani College of Medicine, Tampa, Florida

Dae Hyun Lee, MD
Department of Internal Medicine, University of South Florida Morsani College of Medicine, Tampa, Florida

Sowmya Nanjappa, MBBS, MD
Department of Internal Medicine and Department of Oncologic Sciences, H. Lee Moffitt Cancer Center and Research Institute, University of South Florida Morsani College of Medicine, Tampa, Florida

Julie Gnage, MPH
H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida

John N. Greene, MD
H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida

Citation:
Edwards JN, Denham JD, Lee DH, Nanjappa S, Gnage J, Greene JN. Bed bugs in clinical settings: case report and literature review [published online September 14, 2018]. Infectious Diseases Consultant.

 

ABSTRACT: Over the past 20 years, the worldwide resurgence of bed bug infestations in clinical settings has generated an increased interest in the medical community. Although no evidence exists that bed bugs act as vectors for pathogens, these insects can greatly complicate treatment of patients requiring community or hospital care. This article describes the case of a patient with cutaneous T-cell lymphoma with bed bug infestation affecting the delivery of health care at a tertiary academic cancer center. We discuss the pathophysiology, diagnosis, and treatment of bed bugs, as well as infection-control implications.

Over the past 20 years, bed bug infestations have reemerged in clinical settings.1 Bed bugs are hematophagous arthropods in the Hemiptera order of the Cimicidae family. These insects are an off-white color as nymphs and are reddish-brown in the latter stages of their life cycle. The 2 species of bed bugs associated with humans are Cimex hemipterus (inhabiting tropical and subtropical climates) and Cimex lectularius (inhabiting mainly temperate climates).2 Bed bug bites mainly cause a pruriginous maculopapular rash but, unlike other arthropods, are not known to act as vectors for pathogens. Despite this, bed bugs can cause significant disruption to patient care, produce fear of contagion among staff and patients, and result in expensive procedures for containment and control of spread.2-5

Case Report

A 73-year-old homeless man recently had received a diagnosis of cutaneous T-cell lymphoma with Sézary syndrome (T4N3B1M0). His chief concern was a pruritic dry rash of the bilateral upper extremities, which had spread progressively to his face, trunk, and legs. Peripheral blood flow cytometry results showed atypical T lymphocytes (43% predominance). Findings of a positron emission tomography plus computed tomography (PET/CT) scan showed hypermetabolic activity in the neck, bilateral subpectoral, axillary, and inguinal lymph nodes. Skin punch biopsy showed atypical lymphocytic infiltration. Biopsy of an epitrochlear lymph node demonstrated involvement with T-cell mycosis fungoides. He had been treated previously with bexarotene and photopheresis without significant improvement. He then had begun treatment with romidepsin. After the first 2 doses of the first cycle, the patient’s pruritus and rash resolved. He had no significant adverse reactions.

During his visit for the second cycle of treatment with romidepsin, he presented with new-onset pruritic erythematous papules on the upper arm and upper back. (Figures 1 and 2 depict a different patient who had similar lesions.) Small red insects, soon to be identified as C lectularius, were found on the patient’s bed (Figure 3).

Bedbugs figure 1
Bedbugs figure 2

Figures 1 and 2. A different patient presented with new-onset pruritic, erythematous papules on the upper arms and upper back, similar to our patient’s lesions.

Bedbugs figure 3
Figure 3. Clinical specimen of a bed bug (photo courtesy Ramon Sandin, MD).

The nurse caring for the patient believed that she had received bites, as well. The patient initially was in denial about having bed bugs and expressed anger and embarrassment when informed of the finding. The bed bugs had been brought to the hospital by the patient, and the truck cab in which he slept also was infested and was later fumigated.

Through collaboration and consultation with social workers, nurses, hospital infection control specialists, and the state health department, a comprehensive protocol was developed that successfully prevented a bed bug infestation of the staff and facility. Measures taken at the clinic included having the patient shower and change into disposable scrubs, along with double-bagging of all his belongings. Staff involved directly in the care of the patient wore gowns and gloves. This allowed the patient to successfully complete 7 cycles of romidepsin in a busy outpatient infusion center.

At the time of the patient’s last visit, he was found to be free of bed bugs. The treatment facility made the decision to dispose of some of the furniture used in the care of the patient (eg, the infusion chair).

Clinical Manifestations of Bed Bugs

Bed bugs harbor in dark recesses such as bedclothes, mattresses, springs, bedframes, cracks, crevices, and wallpaper.1 Because these arthropods do not possess wings, their movement typically occurs via direct physical contact with surfaces. Their spread occurs principally via 2 mechanisms: active transmission and passive transmission. Active transmission occurs by bed bugs crawling across neighboring areas. Passive transmission, however, occurs by transfer of bed bugs via fomites (eg, clothes, bags, linens, furniture). Evidence also suggests that bed bugs are capable of dispersing by small air currents and by static electricity.6 Because of their ability to survive up to 5 months without feeding, leaving infested rooms vacant is not an effective solution in resolving a bed bug infestation.7

Bed bugs are night feeders of humans, with painless bites attributed to their needle-like stylets that penetrate the skin. Multiple bites often exhibit characteristic lined and curved patterns on exposed areas of the body from either a single bed bug probing to find a productive capillary bed or many bed bugs feeding along a zone of exposed skin. For individuals who do not experience a reaction from the bed bug bite itself, the area appears as a small punctum with no surrounding reaction.2

The severity of cutaneous reactions from bed bug bites varies between individuals. Some individuals develop no reaction, although this may depend on previous exposures.8 In individuals who do mount a reaction against bed bug bites, pruriginous macules or papules develop, usually within 48 hours. These reactions manifest frequently as 2- to 5-mm pruritic, erythematous papules or wheals with a central hemorrhagic punctum. These lesions tend to be intensely itchy.8 Bed bug bites also can appear as papular urticaria, and individuals with them may develop immunoglobulin G (IgG) antibodies against C lectularius.9,10 Skin reactions that mimic urticaria produce edema in the upper dermis, as well as a perivascular inflammatory infiltration with lymphocytes, eosinophils, and mast cells.11,12 Occasionally, more-severe bullous lesions can develop with intraepidermal edema, subepidermal edema, and a mixed dermal inflammatory infiltrate.13-16 One case report described bullous lesions with histopathologic features consistent with cutaneous vasculitis.15 Occasionally, systemic allergic reactions or systemic manifestations may occur, such as iron-deficiency anemia.3,17

Bed Bugs as Vectors for Pathogens

Within the medical community, there has been debate as to whether bed bugs are capable of acting as vectors of disease to humans.18 Among the human pathogens that have been detected in bed bugs are hepatitis B virus,19,20 hepatitis C virus,20 Trypanosoma cruzi,21 HIV,22,23 and methicillin-resistant Staphylococcus aureus.24,25 Although these pathogens can exist within the bed bug and transmit diseases to other animals, no evidence exists to confirm that bed bugs are capable of acting as vectors of these diseases to other humans.26

Diagnosis

The successful diagnosis of bed bug infestation must be confirmed by physical detection of the insects. Although the linear feeding pattern can be a reasonable indicator, this feeding pattern does not occur in all cases, such as when few bed bugs are present. The detection of bed bugs can be accomplished by way of visual inspection, isolation with physical traps baited with chemical attractants, or through the action of bed bug–detection dogs.27 Other signs can include molted cast skins of bed bugs, or feces or blood on bedding, mattresses, or wallpaper.28,29 Skin biopsies for detection of bed bug bites have proven to yield nonspecific results and are unnecessary.

When diagnosing bed bug infestation, it is important to consider the differential diagnosis for other arthropod bites that result in pruritic papules. Bites of bat bugs or swallow bugs, scabies, fleas, Cheyletiella mites, and other mite species can be mistaken for bed bug bites. Dermatitis herpetiformis is also included in the differential diagnosis. This rash is characterized by pruritic inflammatory papules and vesicles on the forearms, knees, scalp, or buttocks and can be confirmed via biopsy with direct immunofluorescence studies.

Treatment and Posttreatment Effects

Patients with bed bug bites should maintain good hygiene to prevent secondary infection and should avoid scratching the bites, although many patients will scratch them during sleep. Asymptomatic bed bug bites do not require treatment. Symptomatic management of patients with significant pruritus includes a topical corticosteroid, systemic antihistamine, or both.28,30,31 Secondary infections should be managed with appropriate antibiotics.

Bed bug infestations can also produce serious physiological effects during and long after an episode has resolved. Bed bug bites and infestations can result in varying degrees of anxiety and depression, disruption in sleep, ostracism from friends and family, financial burdens, or loss of work. Furthermore, unaffected individuals may believe they have a bed bug infestation. Mistaken individuals may report skin lesions resembling bed bug bites or exposure to an individual or family member with bed bugs. This may cause unaffected individuals to take measures to eradicate nonexistent bed bugs, resulting in personal or financial distress.

Bed Bugs and Denial of Health Care

In 2013 in Hawaii, a 58-year-old terminally ill man with skin cancer metastatic to bone experienced the devastating effects of the denial of medical care due to fear of bed bug transmission.32 Bed bugs infested his home and bed, forcing him to sleep in a wheelchair in his living room. The patient subsequently was denied health care due to the risk of possible infestation of health care workers. This denial of health care not only caused the patient to break his clavicle trying to clean up the bed bugs, but also resulted in dehydration and hospitalization for 6 days as a result of acute kidney injury.

In 2011, a 43-year-old woman who had been disabled for 10 years as a result of 3 motor vehicle accidents experienced a similar situation in Colorado.33 After speaking with her physician about a spinal injection for her back pain, the physician reportedly refused to provide her with health care due to a fear of bed bug spread and hospital infestation. Eventually, the physician performed the procedure after extensive preparation and education of the staff.

These 2 examples demonstrate that bed bug infestation can seriously disrupt a patient’s access to health care and may result in delayed or deferred care.

Financial Implications of Bed Bugs in Hospitals

In 2011, bed bug infestations were widely reported from Colorado to Maine.34 This widespread presence of bed bugs in clinical settings necessitates discussion about their costly removal. One study analyzed the costs of bed bug management at a single tertiary-care academic medical center.5 Throughout the study period, 180 bed bug events occurred (approximately 1 event every 2.2 days). The calculated annual cost for removal and control of the bed bug infestations totaled $22,844 for the adult emergency department and $55,915 for the medical center. These costly management fees highlight the additional financial implications associated with bed bugs’ presence in the health care system.4,5 For example, a single patient with severe anemia caused by bed bugs was unknowingly transported via ambulance, placed in a treatment cubicle, a hospital room, and 2 radiology wards. This required substantive disinfection of the places within the hospital that the patient had visited, as well as the patient’s neighboring apartments and public transportation.3

Infection Control

These situations generate the opportunity to discuss the ethical and moral implications of refusing to care for patients with bed bugs, as well as how hospitals can manage the ethics of patient autonomy and hospital safety with a reasonable policy.35,36 Following infection-control guidelines may facilitate early prevention of outbreaks in the health care setting.37

The first step is to identify patients with bed bug infestation at triage. If a patient presents with suspected bed bug infestation, a specimen can be sent to an entomologist for definitive identification.38 Contact precautions and changing the patient’s clothing into hospital scrubs is necessary. The patient’s belongings should be double-bagged and sealed with tape. These bagged items should be placed in extreme temperatures (above 60°C or below –17°C).2 Bed bugs are also capable of inhabiting and hiding inside electronic devices, and these items should also be taken into consideration. Patient education and counseling about eradication of bed bugs should be provided. These steps should be repeated with each patient visit until the patient and their residence is free of bed bugs.

An alert should be added into the patient’s chart for present and future identification. The importance of education and awareness of hospital staff members is also fundamental to effectively managing these situations and avoiding the spread of infestation.

Entomologic Identification of Bed Bugs

Health care providers serving populations at risk for bed bug infestation should be trained to be aware of the lesions characteristic of bed bug infestation. A cursory understanding of the morphology of the bed bug insect itself is recommended for health care professionals involved in the triage of patients to prevent infested individuals from unknowingly spreading bed bugs into other parts of the health care facility. If a suspected bed bug adult or nymph is recovered from a patient, and laboratory identification is desired, the specimen can be stored dried or placed into a liquid transport medium (typically 70% to 90% ethanol) to prevent desiccation of and damage to of the specimen.39 For health care or laboratory professionals seeking to identify specimens, we recommend reviewing an entomology atlas or reviewing the excellent resource by Usinger.38

The Take-Home Message

Bed bugs can negatively affect a patient’s ability to access timely and appropriate health care. Because of the costs associated with decontaminating a facility infested with bed bugs, careful screening at triage should be undertaken. At facilities that serve patient populations who are at risk for bed bug infestation, health care providers should be educated in bed bugs’ appearance and the lesions characteristic of their bites. Regarding patients presenting with bed bug infestation, a multidisciplinary approach involving social workers, nurses, hospital infection control personnel, housekeeping staff, and county or state public health authorities should be undertaken to protect other patients and frontline health care providers from bed bug infestation.

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