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A framework for assessing the lifetime economic burden of congenital cytomegalovirus in the United States
Cost Effectiveness and Resource Allocation volume 17, Article number: 21 (2019)
In the United States (US), congenital cytomegalovirus infection (cCMVi) is a major cause of permanent disabilities and the most common etiology of non-genetic sensorineural hearing loss. Evaluations of prevention strategies will require estimates of the economic implications of cCMVi. We aimed to develop a conceptual framework to characterize the lifetime economic burden of cCMVi in the US and to use that framework to identify data gaps.
Direct health care, direct non-health care, indirect, and intangible costs associated with cCMVi were considered. An initial framework was constructed based on a targeted literature review, then validated and refined after consultation with experts. Published costs were identified and used to populate the framework. Data gaps were identified.
The framework was constructed as a chance tree, categorizing clinical event occurrence to form patient profiles associated with distinct economic trajectories. The distribution and magnitude of costs varied by patient life stage, cCMVi diagnosis, severity of impairment, and developmental delays/disabilities. Published studies could not fully populate the framework. The literature best characterized direct health care costs associated with the birth period. Gaps existed for direct non-health care, indirect, and intangible costs, as well as health care costs associated with adult patients and those severely impaired.
Data gaps exist concerning the lifetime economic burden of cCMVi in the US. The conceptual framework provides the basis for a research agenda to address these gaps. Understanding the full lifetime economic burden of cCMVi would inform clinicians, researchers, and policymakers, when assessing the value of cCMVi interventions.
Approximately 50% of people in the United States (US) have had human cytomegalovirus (CMV) infection by adulthood, as determined by positive serology . The virus is spread by close contact with an infected person through saliva, urine, or other body fluids and also can be transmitted from a pregnant woman to her fetus during pregnancy—termed congenital CMV infection (cCMVi) . In the US, cCMVi occurs in approximately 0.35% to 0.67% of births .
About 25% of infants with cCMVi are born with abnormalities such as sensorineural hearing loss (SNHL), chorioretinitis, jaundice, hepatitis, or microcephaly [2, 4]. While most infants are normal at birth, they may develop these abnormalities over time [2, 4]. Regardless of clinical status at birth, approximately 18% of all children with cCMVi develop permanent neurodevelopmental delays or disabilities, often associated with SNHL or vision loss . With cCMVi being the most common congenital infection in the US [5, 6], a significant need exists to reduce its burden.
There are no US Food and Drug Administration (FDA)–approved drug treatments for cCMVi. Off-label use of the antiviral drug ganciclovir and its prodrug valganciclovir are recommended for treating moderate to severe clinical manifestations of cCMVi in the neonatal period, with some clinicians using the antivirals in less severe cases . However, a recent clinical trial demonstrated only modest short-term efficacy for valganciclovir and spurred debate on duration of treatment . Moreover, there are no FDA-approved vaccines or medications to prevent acquisition of CMV during pregnancy or mother-to-fetus transmission, but clinical trials are ongoing .
As interventions to prevent the economic consequences of cCMVi are developed, decision makers will require estimates of the economic burden of cCMVi to assess the cost-effectiveness of these new primary and secondary prevention efforts. Conceptual frameworks have been used previously [10, 11] to evaluate the lifetime economic burden of congenital diseases and other conditions and to inform future research agendas (e.g., [10,11,12]).
With this in mind, the objectives of this study are (1) to develop a conceptual framework to characterize the lifetime economic burden of cCMVi in the US and (2) to use that framework to identify current data gaps for future research into the cost burden of cCMVi in the US.
The study’s objectives were addressed in two parts. First, an initial conceptual framework was constructed, then validated and refined in consultation with cCMV experts. Second, for each component of the conceptual framework, costs were either identified from the published literature or flagged as data gaps.
This study focused only on cCMVi-specific costs. Outcomes related to placental CMV infection and inflammation, e.g., fetal loss, preterm delivery, and intrauterine growth restriction, were not included. These important birth outcomes have multiple causes [13, 14], and the fraction attributable to cCMVi is still being defined.
To develop the initial conceptual framework, an impact inventory of costs associated with cCMVi was constructed in accordance with current US methods guidance . Published burden-of-illness studies in congenital diseases [10, 16] were used as models for adapting the impact inventory to cCMVi. The conceptual framework, which was developed by a team of health economists, physicians, and clinical specialists and researchers, included the following types of condition-related costs, per best practices for health economic evaluations :
Direct health care costs (e.g., tests, physical therapy, occupational therapy).
Direct non-health care costs (e.g., transportation, social services, education, special housing).
Indirect costs (e.g., mortality- and morbidity-associated productivity loss for the patient, and caregiver).
Intangible costs (e.g., increased anxiety or stress or other costs not typically monetized).
In addition, published literature on the classification of impairment, disability, and developmental delay was used to inform development of the framework [17,18,19,20]. The World Health Organization (WHO) in The International Classification of Functioning, Disability and Health for Children and Youth (ICF-CY) defines impairment as “a loss or abnormality in body structure or physiological function (including mental functions)” [17; p229] citing examples of paralysis, cardiomyopathy, and deafness. Specific to cCMVi, examples include SNHL, vision loss, and neurological disorders, all of which may vary in severity. According to the WHO’s Early Childhood Development and Disability: A Discussion Paper, impairments may result in developmental delays (“significant variation in the achievement of expected milestones for [an individual’s] actual or adjusted age” [21; p12]) or disabilities (“negative aspects of the interaction between an individual [with a health condition] and that individual’s contextual factors [environmental and personal factors]” [21; p228]). According to the American Academy of Pediatrics , delays may occur in one or more areas of physical, language, intellectual, social, or emotional development and may be precursors to disabilities. If a developmental delay or disability is not detected early enough for targeted interventions, it may progress or become permanent [19, 20].
To capture the comprehensive cost of cCMVi, the impact inventory’s costs were examined for when (i.e., at what life stage) and how (e.g., degree of severity of cCMVi-related impairments) these costs would occur. For example, patients with cCMVi may have the bulk of one type of costs occur at one life stage (e.g., antiviral therapy during birth/infancy), while other types of costs may be incurred over a longer time span (e.g., SNHL management throughout childhood and into adulthood). Additionally, patients with severe impairment may use different resources (e.g., supplemental housing, and caregiver time) than patients with mild impairments. Different trajectories for patients with cCMVi were constructed and organized in the form of a chance tree to illustrate the clinical and cost dependencies, and the chance tree was reviewed with experts in the field of cCMV, including two medical epidemiologists (one as a co-author), a physician subspecialist (co-author), a ranking member of a cCMV parent/family advocacy and support organization, a community hospital pharmacy director, and a C-Suite medical director.
To estimate the lifetime cost of cCMVi and identify relevant data gaps in the literature for estimating this cost, an initial targeted literature review was conducted by using keywords to search for US studies in PubMed and Google Scholar (e.g., “congenital CMV” AND [“economic burden” OR “cost” OR “framework”]). Preliminary estimates were discussed with cCMV experts, and the literature was searched again using focused keywords. The literature searches were targeted to fill the trajectories illustrated by the conceptual framework. Tables of relevant and recent cost estimates were compiled, and data gaps were identified.
Key articles contributing insights to the development of the conceptual framework included cost-effectiveness analyses of interventions or vaccines for cCMVi in the US [22,23,24,25]; however, most of these analyses [22,23,24] relied on data for non-cCMVi-specific patient populations with disabilities that were published more than 25 years ago.
Few published economic studies of cCMVi–specific patient populations were identified. The literature review yielded four studies estimating direct health care costs for patients with cCMVi at birth [26, 27] or in the first year of life [27,28,29]. Three of the four studies [26,27,28,29] relied on the Kids’ Inpatient Database developed for the Healthcare Cost and Utilization Project . The fourth study used two Truven Health Analytics MarketScan Research Databases (IBM Corp., Armonk, New York). No analyses were found that reported the costs of cCMVi after the first year.
The conceptual framework (Fig. 1) depicts key cCMVi profiles with economic trajectories corresponding to the life stages of the patient (i.e., birth/infancy, childhood/adolescence, and adulthood). The framework assumes distinct but equivalent trajectories for diagnosed or undiagnosed cCMVi, although the chances of downstream consequences on a trajectory vary depending on diagnosis and any interventions. The framework differentiates trajectories according to the degree of impairment (severe versus mild to moderate) and whether developmental delays or disabilities manifest as a result of impairment. These trajectories were differentiated because they represent substantially different cost profiles over a patient’s life. The framework is agnostic to the types of developmental delays or disabilities included within the categories of mild to moderate and severe impairment. However, for purposes of the literature review, assumptions were made regarding what these categories contain, as described in the results below.
The framework was populated with US-based cost estimates for patients with cCMVi where available. Cost estimates were inflated to 2018 US dollars (US $) using the medical care component of the Consumer Price Index .
Table 1 displays estimates of direct health care costs related to cCMVi in the first year of life [26,27,28,29]. The studies used to populate Table 1 differed in patient population (all infants with diagnosed with cCMVi [27, 28] vs infants diagnosed with cCMVi and presence of specific symptoms at birth [26, 29]) and type of direct health care cost (all direct health care costs vs. hospitalization costs only [26,27,28,29]).
Clinical and economic drivers of the costs of cCMVi at birth and through the first year of life were found to be low birth weight [26, 29] and inpatient costs. In addition, inpatient costs were greater during the birth period than any other period during the first year of life [27, 29]. No direct non-health care, indirect, or intangible costs were included in the four studies. Because of this, the total economic burden of cCMVi during the first year of life could not be assessed.
According to a review of studies of children with cCMVi, the cCMVi-related infant mortality rate for children with symptoms at birth ranges from 5 to 10% in the US . Three of the above studies—Candrilli and Trantham , Lopez et al. , and Inagaki et al. —found similar mortality rates in their analyses. Estimates of a long-term cCMVi-related mortality rate were not found in the literature. In addition to direct costs and patient (resulting from the loss of a productive lifetime) and caregiver indirect costs, early death of a child due to cCMVi may cause parental loss of productivity or income because of bereavement. Studies that estimate costs associated with premature mortality also may consider costs of living longer, although there are methodological and practical difficulties in doing so .
Severe impairment with permanent disability
The clinical manifestations of severe impairment resulting from cCMVi generally include microcephaly, seizures, and lack of motor function or language  and lead to permanent disability. Case reports [35, 36] and interviews with cCMV experts provided detailed descriptions of patients with severe impairment from cCMVi and the medical resources required to support them (Merck Sharp & Dohme Corp, data on file, January 23, 2018). The range of severe impairments described included autism-like syndromes , learning disabilities, severe cognitive impairment, and a range of disabilities necessitating special education . Interviews with patient advocates and clinical leaders in the field of cCMV suggest that the lifetime costs of cCMVi may be largest among patients with severe impairment, but these patients may represent a heterogeneous group difficult to study.
Published cost estimates for patients with severe impairment resulting from cCMVi were not available. Congenital conditions, including Zika-associated microcephaly and fetal alcohol spectrum disorder may be similar to the severe impairment resulting from cCMVi . Published studies of these conditions estimate lifetime economic costs in the millions of dollars [38, 39]. The lifetime economic burden of severe impairment resulting from cCMVi may be of the same magnitude.
Lavelle et al.  suggested that the economic burden for patients with severe impairment resulting from cCMVi may be weighted heavily toward travel assistance, unpaid family–caregiver time, education support, and supplemental housing. Similarly, intangible costs may include requiring the family to adapt daily schedules to accommodate the combination of impairments. According to the member of a patient/family advocacy and support organization, families of severely affected children may need to move to a different state that provides greater medical benefits aligned with the child’s needs.
Mild to moderate impairment with no developmental delay/disability
Although cCMVi-related impairments may not interfere with long-term neurodevelopment, managing these abnormalities to maintain normal development may require health care resources. Estimates of the annual direct health care costs related to SNHL and vision loss from any cause range from about $1000 per patient (inflated from 2016 to 2018 US $)  for SNHL to almost $8000 per patient (inflated from 2013 to 2018 US $)  for vision loss (Table 2).
Health care resource use for SNHL may include hearing device components, e.g., cochlear implants, which require surgery. Health care costs may be compounded over time (e.g., cochlear implants typically need to be replaced as the patient ages) . Direct non-health care costs (e.g., educational support for missed classes) and indirect costs (e.g., lost productivity for missed workdays) may be incurred . Moreover, intangible costs related to undergoing surgery, including heightened anxiety and short-term decreases in quality of life, also may arise.
Mild to moderate impairment with developmental delay/disability in childhood/adolescence
Although cost estimates for developmental delays and disabilities were not available in the literature for patients with cCMVi specifically, recent estimates for proxy conditions, e.g., autism spectrum disorder (ASD), attention-deficit/hyperactivity disorder, and cerebral palsy (CP), were available. Table 3 presents the annual condition-related direct health care and non-health care costs for patients in childhood/adolescence with these proxy conditions. For patients in childhood/adolescence with ASD, annual condition-related direct health care and non-health care costs were roughly $4000 and $17,000 per patient, respectively (inflated from 2011 to 2018 US $) . For patients in childhood/adolescence with CP with or without intellectual disability (ID), annual condition-related direct health care costs ranged from roughly $22,000 (CP without ID) to $62,000 (CP with co-occurring ID) (inflated from 2005 to 2018 US $) .
The economic costs associated with developmental delays and disabilities may include managing significant learning, behavioral, or motor dysfunction [37, 44, 45]. Moreover, these patients may need special education, caregiver attention, or supplemental housing in addition to routine medical care [40, 46]. Interviews with cCMV experts suggested that parents of children with cCMVi exhibiting even mild developmental delays or disabilities may experience costs associated with increased anxiety, depression, or familial tension (Merck Sharp & Dohme Corp, data on file, January 23, 2018).
Patients with cCMVi who experience developmental delays or disabilities in childhood/adolescence may progress into adulthood with permanent disabilities. Cost estimates of adults with disabilities resulting from cCMVi specifically were not found in the literature, but one study  of adult, non-elderly patients with disabilities reported an annual incremental direct health care cost of roughly $14,000 per year compared with similar patients without disabilities (Table 3, inflated from 2004 to 2018 US $).
Assessing the full economic burden of cCMVi is essential for estimating the economic value of primary and secondary interventions, e.g., screening, vaccination, and clinical management to prevent impairment and permanent disabilities. Prior to this research, no comprehensive assessment of the lifetime economic burden of cCMVi had been presented in the published literature. This study developed a conceptual framework following current US guidelines for health economic evaluations . The conceptual framework was developed by a team of economists and clinical experts in cCMV and informed by published literature and guidance from stakeholders in the patient advocacy, hospital, health insurance, and public health fields. The framework was used to direct searches for published cost estimates for cCMVi and to identify key data gaps in populating the framework, of which many were identified (see Additional file 1: Table S1). The findings from this qualitative project provide the basis for a research agenda to address these gaps.
Although the conceptual framework identified an array of cost impacts relevant to the lifetime economic burden of cCMVi, research published to date has focused primarily on direct health care costs during the first year of life. No published studies of direct non-health care, indirect, and intangible costs were identified. No published work was found that addressed costs of severe impairment resulting from cCMVi or costs for adult patients.
Some research suggests that cCMVi may result in conditions similar to ASD and CP [35, 46], but no studies of the costs of these disorders in patients with cCMVi were identified. Authors of previous economic analyses for cCMVi interventions have considered the economic consequences of cCMVi but without having cCMVi-specific costs to populate their models (e.g., [16, 22, 24] [non-US]). In two of these analyses  and Lawrence et al.  cost estimates for ID, vision loss, and SNHL were added together in different combinations to reflect the heterogeneity of cCMVi outcomes. However, the total economic burden of patients with cCMVi may be compounded by each individual consequence of the infection .
To address data gaps pertaining to the lifetime economic burden of cCMVi in the US, researchers have several potential resources, including health insurance claims databases (e.g., those maintained by IBM), publicly available health surveys, disease registries (e.g., the National Congenital CMV Disease Registry), and parent/family advocacy and support organizations (e.g., The National CMV Foundation). However, these data sources have limitations with regard to informing lifetime cost studies. For example, health insurance claims databases have a relatively restricted period of follow-up because of movement across plans (e.g.,  suggest that 20% of commercially insured people in the US change insurers annually). Therefore, distinguishing congenital and postnatal CMV infection may not be feasible in a health insurance claims database.
Disease registries have a period of follow-up that is likely to be much longer than a typical claims database. Registries also may offer data indicating direct and indirect costs, although the data may not be collected systematically or be complete given that these registries’ missions may not refer explicitly to assessing the economic burden of cCMVi (e.g., as in the National Congenital CMV Disease Registry) .
Additional research using existing data sources may be valuable, but for cCMVi such sources may have limitations that could make primary data collection studies or hybrid studies (i.e., complementing existing data sources with primary data collection) necessary to fill the gaps. For example, an inventory of cCMVi patient registries and the data they collect as well as their capacity to link to other data sources (e.g., US health insurance claims data) or expand the data collected (e.g., via a survey of registry participants or their families) would be informative to potential researchers. Linking data sources also may help researchers characterize the costs incurred before patients are diagnosed with cCMVi or associated with a delayed cCMVi diagnosis.
The methods used for this study were similar to those used in other disease areas (e.g., [10, 12]) and relied in part on targeted reviews of the published literature. Conducting a systematic literature review to develop the conceptual framework would have introduced premature and potentially artificial restrictions. Instead, a more pragmatic, targeted literature review, customized to identify the studies most likely to reveal the potential lifetime cost of cCMVi was appropriate. The targeted literature reviews identified costs and data gaps in the existing published data characterizing the economic burden of cCMVi. The costs presented here may be useful for researchers quantifying the economic burden of cCMVi. However, because of the differences in study designs, caution should be taken when evaluating the costs of cCMVi presented in the literature.
The conceptual framework and resulting analysis presented here were developed using the current state of pertinent knowledge of cCMVi. The field of cCMVi research is growing, so the assumptions underlying the conceptual framework may evolve as researchers make new discoveries. As new primary and secondary interventions for cCMVi are developed, decision makers must assess the implications for cCMVi management guidelines. To evaluate accurately the cost-effectiveness and affordability of new interventions, comprehensive estimates of the lifetime economic burden of cCMVi will be required.
This study has highlighted significant data gaps, particularly with respect to estimates of direct health and non-health care costs for adult patients and those with severe impairment, costs incurred prior to an established cCMVi diagnosis, and indirect and intangible costs. Existing data sources, e.g., health insurance claims databases and registries, may provide valuable data, but new primary data collection studies are necessary to capture the range of costs associated with cCMVi. The conceptual framework developed in this study may serve as a helpful foundation for future research in estimating these costs.
Availability of data and materials
autism spectrum disorder
Commercial Claims and Encounters
congenital CMV infection
Consumer Price Index
US Food and Drug Administration
human immunodeficiency virus
International Classification of Diseases, 9th Revision, Clinical Modification
International Classification of Diseases, 10th Revision, Clinical Modification
International Classification of Functioning, Disability and Health for Children and Youth
Kids’ Inpatient Database
Medical Expenditure Panel Survey
National Health Interview Survey
sensorineural hearing loss
World Health Organization
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This study was supported by Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA.
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AS and SS are Merck employees. LG has received an honorarium from Merck for her contribution to this work. AL, KBF, CB, and DM have no competing interests.
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Lucas, A., Sinha, A., Fowler, K.B. et al. A framework for assessing the lifetime economic burden of congenital cytomegalovirus in the United States. Cost Eff Resour Alloc 17, 21 (2019) doi:10.1186/s12962-019-0189-0
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