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Print version ISSN 0042-9686
Bull World Health Organ vol.90 n.9 Genebra Sep. 2012
LESSONS FROM THE FIELD
Mise en œuvre du diagnostic précoce de l'infection par le VIH des nourrissons, au niveau des soins primaires: expériences et défis au Malawi
La aplicación de un diagnóstico temprano de la infección por VIH en lactantes en el ámbito de la atención primaria: Experiencias y desafíos en Malawi
Queen DubeI; Anna DowII; Chawanangwa ChiramboI; Jill LebovII; Lyson TenthaniIII; Michael MooreI; Robert S HeydermanI; Annelies Van RieII,* for the CHIDEV study team
IMalawiLiverpoolWellcome Trust Clinical Research Programme, Queen Elizabeth Central Hospital, Blantyre, Malawi
IIDepartment of Epidemiology, University of North Carolina Gillings School of Global Public Health, 135 Dauer Drive, Campus Box 7435, Chapel Hill, NC 27599, United States of America
IIIHIV Unit, Malawi Ministry of Health, Lilongwe, Malawi
PROBLEM: Malawi's national guidelines recommend that infants exposed to the human immunodeficiency virus (HIV) be tested at 6 weeks of age. Rollout of services for early infant diagnosis has been limited and has resulted in the initiation of antiretroviral therapy (ART) in very few infants.
APPROACH: An early infant diagnosis programme was launched. It included education of pregnant women on infant testing, community sensitization, free infant testing at 6 weeks of age, active tracing of HIV-positive infants and referral for treatment and care.
LOCAL SETTING: The programme was established in two primary care facilities in Blantyre, Malawi.
RELEVANT CHANGES: Of 1214 HIV-exposed infants, 71.6% presented for early diagnosis, and 14.5% of those who presented tested positive for HIV. Further testing of 103 of these 126 apparently HIV-positive infants confirmed infection in 88; the other 15 results were false positives. The initial polymerase chain reaction testing of dried blood spots had a positive predictive value (PPV) of 85.4%. Despite active tracing, only 87.3% (110/126) of the mothers of infants who initially tested positive were told their infants' test results. ART was initiated in 58% of the infants with confirmed HIV infection.
LESSONS LEARNT: Early infant diagnosis of HIV infection at the primary care level in a resource-poor setting is challenging. Many children in the HIV diagnosis and treatment programme were lost to follow-up at various stages. Diagnostic tools with higher PPV and point-of-care capacity and better infrastructures for administering ART are needed to improve the management of HIV-exposed and HIV-infected infants.
PROBLÈME: Les lignes directrices nationales du Malawi recommandent que les nourrissons exposés au virus de l'immunodéficience humaine (VIH) soient testés à l'âge de 6 semaines. Le déploiement des services pour le diagnostic précoce chez les nourrissons a été limité et n'a donné lieu au lancement de la thérapie antirétrovirale (TAR) que chez très peu de nourrissons.
APPROCHE: Un programme de diagnostic infantile précoce a été lancé. Il comprenait l'éducation des femmes enceintes quant aux tests des nourrissons, la sensibilisation des communautés, le test gratuit des nourrissons âgés de 6 semaines, le traçage actif des nourrissons séropositifs et l'aiguillage pour le traitement et les soins.
ENVIRONNEMENT LOCAL: Le programme a été établi dans deux établissements de soins de santé primaires à Blantyre, au Malawi.
CHANGEMENTS SIGNIFICATIFS: Sur 1 214 nourrissons exposés au VIH, 71,6% bénéficiaient d'un diagnostic précoce, et 14,5% des nourrissons présentés étaient séropositifs. Des tests supplémentaires effectués sur 103 de ces 126 nourrissons apparemment séropositifs ont confirmé l'infection de 88 d'entre eux; les 15 autres résultats étant faussement positifs. Les tests initiaux de réaction en chaîne par polymérase sur des taches de sang séché avaient une valeur prédictive positive (VPP) de 85,4%. Malgré le traçage actif, seules 87,3% (110/126) des mères de nourrissons initialement testés positifs ont été informées des résultats des tests de leurs nourrissons. Un TAR a été initié chez 58% des nourrissons dont l'infection par le VIH a été confirmée.
LEÇONS TIRÉES: Le diagnostic précoce de l'infection par le VIH des nourrissons est un défi au niveau des soins primaires dans un contexte de ressources limitées. Le suivi de nombreux enfants, dans le programme de diagnostic et de traitement du VIH, s'est interrompu à divers stades. Les outils de diagnostic avec une VPP et une capacité de lieu de soins plus élevées, et de meilleures infrastructures pour l'administration du TAR, sont nécessaires pour améliorer la prise en charge des nourrissons exposés et infectés par le VIH.
SITUACIÓN: Las directrices nacionales de Malawi recomiendan que se realice la prueba del virus de la inmunodeficiencia humana (VIH) a los lactantes expuestos al mismo cuando cumplan las 6 semanas de edad. Se ha restringido el desarrollo de los servicios de diagnóstico temprano de lactantes, lo que ha dado como resultado que muy pocos lactantes hayan comenzado con una terapia antirretroviral (TAR).
ENFOQUE: Se lanzó un programa de diagnóstico temprano de lactantes que incluyó la formación de mujeres embarazadas acerca de las pruebas para lactantes, la sensibilización de la comunidad, pruebas gratuitas para lactantes de 6 semanas de edad, el seguimiento activo de lactantes seropositivos y la derivación para su tratamiento y atención sanitaria.
MARCO REGIONAL: El programa se estableció en dos centros de atención sanitaria primaria en Blantye, Malawi.
CAMBIOS IMPORTANTES: De los 1214 lactantes expuestos, el 71,6% acudió al diagnóstico temprano y de ellos, el 14,5% dio positivo para el VIH. Otras pruebas realizadas a 103 de los, al parecer, 126 lactantes seropositivos confirmaron la infección en 88 lactantes, los otros 15 resultados fueron falsos positivos. La reacción en cadena de la polimerasa inicial de muestras de sangre seca tuvo un valor predictivo positivo (VPP) del 85,4%. A pesar del seguimiento activo, sólo se comunicó el resultado de las pruebas al 87,3% (110/126) de las madres de lactantes que en un principio dieron positivo. La TAR se comenzó en el 58% de los lactantes con una infección por VIH confirmada.
LECCIONES APRENDIDAS: El diagnóstico temprano para la infección por VIH en lactantes en el ámbito de la atención primaria en entornos con pocos recursos requiere un gran esfuerzo. En las distintas etapas se perdió el rastro de muchos niños del programa de diagnóstico y tratamiento del VIH. Las herramientas de diagnóstico con un VPP alto y la capacidad de los puntos de atención, así como la mejora de las infraestructuras para la administración de la TAR son necesarias para mejorar la gestión de los lactantes expuestos al VIH e infectados por él.
According to the recommendations of the World Health Organization (WHO), infants known to have been exposed to the human immunodeficiency virus (HIV) should undergo a virological test for infection at 4 to 6 weeks of age.1,2 Antiretroviral therapy (ART) should be initiated upon diagnosis of HIV infection in children aged less than 24 months.3 However, implementing programmes for such early infant diagnosis and treatment has proved challenging.47
In Malawi, 13.8% of the children born to HIV-positive mothers in 2009 were themselves HIV-positive as infants,8 but only 29% of those in need of ART received such treatment.9 National guidelines in Malawi recommend that infants exposed to HIV be tested by polymerase chain reaction (PCR) for the detection of viral deoxyribonucleic acid (DNA) at 6 weeks of age wherever the facilities and resources for these assays are available.10 In Malawi, as in several other countries, most early infant diagnosis is hospital-based and few infants receive ART after testing.8,11
We report here the experiences and challenges encountered during implementation of early infant diagnosis in two community health centres in Malawi.
Setting and approach
As part of recruitment procedures for a study assessing the impact of HIV infection on child neurodevelopmental processes, early infant diagnosis services were established at two health-care facilities in Blantyre. One of these facilities, the Zingwangwa Health Centre, is an urban primary care centre that does not initiate or administer ART but that refers those in need of ART to a hospital. The other study facility, the Mlambe Mission Hospital, is located in a semi-rural area and serves as a primary and secondary care centre with on-site ART services. Both study facilities run programmes for the prevention of mother-to-child transmission (PMTCT) of HIV and both recommend breastfeeding and cotrimoxazole prophylaxis for all HIV-exposed infants.
As pregnant women and mothers with infants attended the study centres for PMTCT and postnatal visits, study staff explained to them the importance of early infant HIV diagnosis and the benefits of early ART for infants. To further increase awareness of early infant diagnosis, posters and brochures were distributed and community sensitization was performed. Each HIV-positive mother was given an appointment card. At 6 weeks of age (or at the earliest visit thereafter), each infant of an HIV-positive mother was referred for cotrimoxazole prophylaxis and tested for HIV DNA. Permission for home visits was requested from the infant's mother, who was asked to return with the infant, for a follow-up, 4 weeks later.
A sample of blood was collected from each HIV-exposed infant via a heel prick. These samples were transferred to Protein Saver 903® cards (Whatman Ltd, Piscataway, United States of America), which were then dried and individually packaged with desiccant sachets before being transported to the MalawiLiverpoolWellcome Trust research laboratory in Blantyre. At the laboratory, the dried blood spots on the cards were tested for HIV DNA using version 1.5 of the Amplicor® HIV-1 DNA test kit (Roche, Basel, Switzerland), which is based on a PCR. The laboratory included internal quality control procedures for each 4-weekly testing batch and participated in an external quality control programme run by the United States Centers for Disease Control and Prevention.
At follow-up, mothers of the children found to be PCR-negative for HIV DNA were counselled on how to minimize transmission risk and the importance of repeat testing while breastfeeding. The mothers of the PCR-positive infants were counselled on the importance of early infant ART and their infants were referred to the nearest ART clinic. Community health staff, who were reimbursed by study funds, were asked to trace the mothers of PCR-positive infants who did not return for the scheduled follow-up.
Attempts were made to retest each child who was initially found PCR-positive. In most cases, the same PCR-based assay as used initially was employed to test a second blood spot on the child's 6-week sample card. However, if the relevant sample card could not be located, the HIV ribonucleic acid (RNA) in a second blood sample collected from the child was quantified, at the University of North Carolina's project laboratory in Lilongwe, using version 1.5 of the Amplicor® HIV-1 Monitor (Roche). If the retest sample gave a positive result, the child was considered truly positive. If the retest sample appeared negative, another blood sample was collected from the child and either tested for HIV DNA or assayed for HIV RNA. If this sample was found negative, the child's result was considered a false positive. The final result for any child who was found first positive and then negative and then was unavailable for a second retest was recorded as inconclusive.
Both the University of Malawi College of Medicine Research and Ethics Committee and the University of North Carolina at Chapel Hill Institutional Review Board approved the study protocol.
Between January 2008 and June 2010, 7234 women, of whom 1214 (16.8%; 95% confidence interval, CI: 15.9%17.6%) were HIV-infected, participated in PMTCT activities at either of the two study centres. Although 920 (75.8%) of the infants of the HIV-positive mothers presented for early infant diagnosis, consent for the necessary testing was only obtained from the mothers of 869 (94.5%; 95% CI: 93.0%95.9%) of these children. In consequence, only 71.6% (95% CI: 69.0%74.1%) of the HIV-exposed infants seen at the two study centres during the study period were tested for HIV DNA. Although all but one of the 50 women who declined to give consent for the infant testing said that they wanted to get permission from their spouses, none of these women ever returned for early infant diagnosis. Self-reported PMTCT coverage, for both mothers and infants at the two study sites, was 92.4%.
Overall, 126 (14.5%) of the 869 infants tested for HIV DNA gave a positive initial result. The original sample cards for 61 of the PCR-positive children were relocated and another blood spot from each of these cards was checked for HIV DNA in the PCR-based assay. Of the 61 children who were retested in this way, 41 gave a positive result on retesting and 20 gave a negative result. Although fresh blood samples were collected from 17 of the 20 children found PCR-negative on retesting, only two of these 17 fresh samples gave a positive result when checked for HIV DNA (5 samples) or assayed for HIV RNA (12 samples). The original sample cards for 65 of the children who were initially found positive for HIV DNA had been thrown away after the initial testing. Fresh blood samples were obtained from 45 of these 65 children and all 45 of these samples gave a positive result when assayed for HIV RNA. Confirmatory testing was not possible for the 20 children who were lost to follow-up. Among the 106 infants with any confirmatory testing, 88 were confirmed as HIV-infected and 15 were considered HIV-negative; the results for the remaining three children, who could not be retested fully, were inconclusive. Overall, 14.6% of the 103 children who were retested fully were found to have been falsely positive in the initial round of testing. The positive predictive value of the assay used in this initial round, which was based on the detection, by PCR, of HIV DNA in dried spots of blood from infants aged about 6 weeks, was therefore 85.4%.
Only 521 (60%) of the mothers of tested infants returned to the study centres to receive the results of the initial testing. However, compared with the other mothers of tested infants, a mother of a child found HIV-positive when first tested by PCR was significantly more likely to have received the results of her infant's test (87.3% versus 55.3%; P < 0.0001). The initiation of ART was recorded for 51 children, who represented 58% of all of the children with confirmed HIV infection.
Important lessons can be drawn from our experience (Box 1). Routine early infant diagnosis at the primary care level in a resource-poor setting is feasible but challenging, even when well supported by research funds. A strength of our approach was the integration of the early infant diagnosis programme into the existing PMTCT services, which facilitated delivery of messages about the importance and availability of early infant diagnosis and early ART to the target population of HIV-infected pregnant women. The scheduling of appointments for early infant diagnosis so that they coincided with routine visits for the vaccination of infants at 6 weeks of age eliminated the need for additional visits for the sole purpose of testing infants for early diagnosis. These approaches resulted in the HIV testing of more than two thirds of the HIV-exposed infants seen at the study centres.
Our experiences with the early infant diagnosis programme also highlighted many challenges. Unfortunately, since HIV exposure was not documented on the standard infant health passports and there was limited privacy in the clinics, it proved impossible to integrate the services for early infant diagnosis with vaccination clinics. The high percentage of false positive results in the initial round of HIV tests (14.6%) was unexpected, given the previously reported high specificity of the PCR-based assay that was used.12,13 Further investigations indicated that laboratory contamination, resulting from the manual manipulation of the sample cards, was the most likely cause of the low specificity. This observation underscores the need for stringent quality control and confirmatory testing. The long delay between the collection of the initial blood samples and the availability of the results of confirmatory testing complicated the communication of an initial positive result and the management of the children with such a result. Knowing the overwhelming benefits of early ART, we did not withhold such treatment until the confirmatory results were available. We carefully counselled the mothers of infants who were initially found PCR-positive while realizing that a positive result on an infant's HIV test is devastating news and that the occurrence of false positive results can undermine community trust in early infant diagnosis.
The use of dried blood spots, which can be collected at any clinic and transported without refrigeration to a laboratory equipped for PCR-based analysis,12 has been an important step towards universal access to early infant diagnosis. However, by eliminating the need to transport samples or to return to a clinic to retrieve the test results, a rapid point-of-care test for infant HIV diagnosis14 could still greatly enhance the operational feasibility of early infant diagnosis programmes in resource-poor settings.
A unique aspect of our approach was the active tracing of HIV-positive infants, which resulted in the receipt of the infants' HIV test results by the families of 87% of these infants. Tracing is unlikely to be possible without dedicated funds. Sustainable strategies to improve the communication of test results to the caregivers of infants in routine settings need to be explored. Infant treatment programmes also need to be scaled up to maximize the number of HIV-infected infants who initiate ART the ultimate goal of early infant diagnosis programmes.
While promising, the 71.6% coverage with early infant diagnostic services that was recorded in the present study indicates that one in four HIV-exposed infants did not access such services. Additionally, the coverage recorded here may be an underestimate of the true value, since the 28% of women in Malawi who deliver at home, with the help of traditional birth attendants,15 may never be offered early infant diagnostic testing (Fig. 1). The involvement of traditional birth attendants in early infant diagnosis programmes and the integration of early infant diagnosis into vaccination clinics with community outreach could complement any clinic-based activities. The routine seeking of permission for infant testing from both the mother and her partner should be explored, as permission from the partner was the primary reason that women who presented for early infant diagnosis gave for not proceeding with the testing.
Although careful documentation and a large sample size were important strengths of this evaluation, the research setting limits the generalizability of our findings. The substantial human resources and financial support that were available in the present study, through linkage with the research team, probably created a "best-case scenario" for a setting that is usually resource-poor. Even under these conditions, however, the implementation of early infant diagnosis at the primary-care level was challenging, with the dropouts that occurred at every step diminishing the number of HIV-infected children who gained access to ART. Our experience suggests that, to maximize the benefits of early infant HIV diagnosis programmes, a simple, affordable and highly specific point-of-care test for infant HIV diagnosis and better linkage to care are both needed.
The MalawiLiverpoolWellcome Trust Research Programme receives funding from the Wellcome Trust. The authors are grateful to all study and clinical staff at Mlambe Mission Hospital, Zingwangwa Health Centre and Queen Elizabeth Central Hospital, and to all participating women and children.
Funding: Funding was provided by the United States National Institutes of Health/National Institute of Child Health and Human Development, via grant R01 HD053216.
Competing interests: None declared.
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(Submitted: 31 January 2012 Revised version received: 5 May 2012 Accepted: 11 May 2012 Published online: 18 June 2012)