Vol. 66, No. 49
December 15, 2017
Health and Development at Age 19–24 Months of 19 Children Who Were Born with Microcephaly and Laboratory Evidence of Congenital Zika Virus Infection During the 2015 Zika Virus Outbreak — Brazil, 2017
Weekly / December 15, 2017 / 66(49);1347–1351
Ashley Satterfield-Nash, DrPH1; Kim Kotzky, MPH1; Jacob Allen, MPH2; Jeanne Bertolli, PhD3; Cynthia A. Moore, MD, PhD3; Isabela Ornelas Pereira4; André Pessoa, MD5; Flavio Melo, MD6; Ana Carolina Faria e Silva Santelli, MD7; Coleen A. Boyle, PhD3; Georgina Peacock, MD3 (View author affiliations)View suggested citation
In November 2015, the Brazilian Ministry of Health (MOH) declared the Zika virus outbreak a public health emergency after an increase in microcephaly cases was reported in the northeast region of the country (1). During 2015–2016, 15 states in Brazil with laboratory-confirmed Zika virus transmission reported an increase in birth prevalence of microcephaly (2.8 cases per 10,000 live births), significantly exceeding prevalence in four states without confirmed transmission (0.6 per 10,000) (2). Although children with microcephaly and laboratory evidence of Zika virus infection have been described in early infancy (3), their subsequent health and development have not been well characterized, constraining planning for the care and support of these children and their families. The Brazilian MOH, the State Health Secretariat of Paraíba, and CDC collaborated on a follow-up investigation of the health and development of children in northeastern Brazil who were reported to national surveillance with microcephaly at birth. Nineteen children with microcephaly at birth and laboratory evidence of Zika virus infection were assessed through clinical evaluations, caregiver interviews, and review of medical records. At follow-up (ages 19–24 months), most of these children had severe motor impairment, seizure disorders, hearing and vision abnormalities, and sleep difficulties. Children with microcephaly and laboratory evidence of Zika virus infection have severe functional limitations and will require specialized care from clinicians and caregivers as they age.
The Zika Outcomes and Development in Infants and Children (ZODIAC) investigation sought to compile a comprehensive description of health and development among children aged >12 months who were born with microcephaly and participated in a 2016 case-control investigation. The case-control investigation assessed the association of Zika virus infection and microcephaly among children aged 1–7 months, living in Paraíba state. The children and their caregivers were evaluated by multidisciplinary teams at two state clinics in Campina Grande and João Pessoa (macroregions 1 and 2) in Paraíba state during August–October 2017. This report describes a subsample of 19 children, aged 19–24 months, who participated in ZODIAC and were born with microcephaly and with laboratory evidence of Zika virus infection.
All children in the ZODIAC investigation were born from October 1, 2015 through January 31, 2016, and were reported to the Registro de Eventos de Saúde Pública (RESP)—Microcefalias, Brazil’s national microcephaly registry. For infants to be eligible for the 2016 case-control investigation, their mothers must have resided in Paraíba state for at least 80% of their pregnancy. For the ZODIAC investigation, microcephaly was defined as head circumference below the third percentile for gestational age and sex, according to INTERGROWTH 21st standards (4). Subsequent measurements are reported in standard deviations (SD) to better characterize growth deficiencies (5). Laboratory evidence of Zika virus infection was defined as a positive test for Zika virus immunoglobulin M (IgM) and virus specific-neutralizing antibodies or a positive test for Zika virus-specific neutralizing antibodies in an infant sample (6). Samples were obtained at age 1–7 months in the 2016 case-control investigation, and any evidence of infection was assumed to be prenatal in origin. Results of prenatal and newborn testing to rule out other congenital infections were available for some infants and their mothers.
ZODIAC data were collected through clinical evaluations, caregiver interviews, and review of medical records. Licensed physicians performed growth, ophthalmologic and physical exams, and a neurologic assessment. Physicians were trained to use the Hammersmith Infant Neurological Examination (HINE), a standardized neurologic exam, to assess neuromotor function and visual and auditory responses (7). Trained interviewers administered screening and assessment instruments to the primary caregiver (usually the mother) regarding the child’s health and development, including a seizure screener (8), the Ages and Stages Questionnaires (ASQ-3),* and the Ages and Stages Social-Emotional Questionnaires (ASQ:SE).† Data were captured in REDCap, a secure web application.
The families of 278 previously studied children residing in the ZODIAC investigation catchment area were eligible for inclusion; 122 children were enrolled, including 19 who were aged <24 months and who had both microcephaly at birth and laboratory evidence of Zika virus infection. Among the 19 children, 11 had a blood specimen that tested positive for Zika virus-specific IgM antibodies and neutralizing antibodies against Zika virus, and eight had only neutralizing antibodies against Zika virus. Among the eight with neutralizing antibodies only, seven had at least one test for other congenital infections; one had a positive Toxoplasma immunoglobulin G (IgG) antibody result and one had positive rubella virus and cytomegalovirus IgG results. Both had negative IgM antibody results for these infections; the first had brain imaging findings consistent with congenital Zika virus infection and the second had no record of imaging.
The median age at follow-up evaluation was 22 months (range = 19–24 months); 10 were male and nine were female. At the time of assessment, 15 children (seven males and eight females) had head circumference measurements more than 3 SDs below the mean for their age and sex (Table 1) (Table 2). Four children had an increase in head circumference for age from birth measurements: three males had head circumference within 1 SD below the mean and one female had head circumference within 1 SD above the mean. Thirteen children (six males and seven females) had length measurements 1–3 SDs below the mean, and 13 children (six males and seven females) had weight measurements 1 to >3 SDs below the mean for their age and sex.
Eleven children screened positive for nonfebrile seizures, indicating possible seizure disorder (Table 2) (Table 3). Caregivers reported that eight children were previously hospitalized, including six hospitalized for bronchitis/pneumonia, and that 10 children had frequent sleeping difficulties and nine had eating or swallowing challenges. Thirteen children had an impaired response to auditory stimuli. Four children had retinal abnormalities and 11 had an impaired response to visual stimuli. Fifteen children did not pass the ASQ-3 age interval questionnaire designed for a child aged 6 months. Fifteen children had a global score below 40 on the HINE, indicating severe motor impairment, including 14 who had findings consistent with cerebral palsy (7). Outcomes including feeding challenges, sleeping difficulties, severe motor impairment, vision and hearing abnormalities, and seizures tended to co-occur. All children had at least one of these outcomes, 12 had three to five of these outcomes, and two had all six outcomes. Four children (infant number 16, 17, 18, and 19) (Table 2) had typical growth and development at follow-up and might have been misclassified at birth.
As of September 2017, 2,986 newborns with microcephaly in Brazil were reported to RESP and 2,959 cases are being monitored (9). Children with Zika virus–associated microcephaly face medical and functional challenges that span many areas of development. Previous reports established a baseline of poor health outcomes at birth, including severe brain and ophthalmologic abnormalities, and other serious central nervous system abnormalities (3). This report expands on initial findings by demonstrating that specific outcomes, such as severe motor impairment and impaired visual and auditory response to stimuli, affect the majority of children with evidence of congenital Zika virus infection and microcephaly and become more apparent as these children age. Approximately three quarters of young children affected by Zika virus infection in this analysis had at least three of the specified co-occurring outcomes. Many of the initial findings identified at birth remain present at ages 19–24 months, and these children are falling far behind in achievement of age-appropriate developmental milestones, indicating the need for long-term follow-up and support.
The findings in this report are subject to at least four limitations. First, although all children with microcephaly recruited into the 2016 case-control investigation from selected areas of Paraíba state were offered enrollment in the ZODIAC investigation, not all families chose to participate. Consequently, the findings might not be representative of all children with microcephaly associated with congenital Zika virus infection. Second, errors in head circumference measurement at birth and passive transfer of maternal antibodies might have led to misidentification and might explain the divergent observations for the four children showing more typical development. Additionally, some of the parent-assessment findings, such as those from the seizure screener, were not medically verified. Finally, the ages of infants in the original case-control investigation ranged from 1 to 7 months at the time of blood collection, and it is possible that the laboratory results for some infants reflected postnatal, rather than prenatal, exposure.
This report provides information on the ongoing challenges facing children with severe congenital Zika virus syndrome; these children will require specialized care from clinicians and caregivers as they age. These findings allow for anticipation of medical and social service needs of affected children and their families, including early intervention services, and planning for resources to support these families in health care and community settings in Brazil, the United States, and other countries. Children with disabilities related to congenital Zika virus infection will need multidisciplinary care from various pediatric subspecialists (10). Long-term follow-up and measurement of developmental progression of children affected by Zika virus can inform intervention services and sub-specialties needed to provide optimal care for these children.
Alanna dos Santos Delfino, Analine de Souza Bandeira Correia, Bruna Valerio Correia, Camila Carla de Arruda Silva, Camille Harden, Camille Smith, Charles Rose, Christine Coeli Moreira da Silva, Claudia Ferreira Rineiro Leao, Cláudia Luciana de Sousa Mascena Veras, Eric Dziuban, Erlane Marques Ribeiro, J. Erin Staples, Joria Guerreiro, Larissa Ribeiro Do Amaral, Maria Celeste Dantas Jotha De Lima, Myrian Carvalho, Daniele Ribeiro Magalhães Camelo, Eliza Gordon-Lipkin, Fabio Ramon Bezerra Clementino, Flawber Antonio Cruz, Georgia Medeiros Lopes De Souza Lucio, Isadora Silveira Xavier, Ivanice Jacinto da Silva, Jeanete Romao dos Santos, Jennita Reefhuis, Juliana Carneiro Monteiro Wanderley, Juliana Sousa Soares De Araujo, Kallytuana Mell Silva Sarmento, Karla Naraiane de Araujo, Karoline Marques Dantas, Mariana Bernardo Bezerra, Mariana Braatz Krueger, Michael Fox, Nathalie Maitre, Nevin Krishna, Pâmela Rodrigues Barbosa, Patricia Karla Guimaraes Brito, Priscila Leal Leite, Rafaela Domingos da Cunha, Rafaela Soares Barros de Menezes, Rafaella Alves Sarmento Costa, Rebecca Bitsko, Renato Girade, Renato Lima, Rogeirio Alves de Santana, Saile Cavalcante Kerbage, Suzanne Gilboa, Thalita Analyane Bezerra de Albuquerque, Thayse Elaine Costa Figueiredo, Vandezita Dantas De Medeiros Mazzaro, Virginia Batista de Morais.
Conflict of Interest
Ana Carolina Faria e Silva Santelli received funding through an Interagency Agreement between the United States Agency for International Development and CDC for work on Zika during conduct of the study. No other conflicts of interest were reported.
Corresponding author: Ashley Satterfield-Nash, firstname.lastname@example.org, 404-498-6084.
1Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee; 2Eagle Global Scientific, San Antonio, Texas; 3National Center on Birth Defects and Developmental Disabilities, CDC; 4Ministry of Health Brazil; 5Hospital Infantil Albert Sabin, Fortaleza, Ceará, Brazil; 6Hospital Regional de Guarabira/Governo do Estado da Paraíba, Paraíba, Brazil; 7Center for Global Health, CDC Brazil.
* A series of 21 parent-completed questionnaires designed to screen the developmental performance of children aged 1–66 months in the areas of communication, gross motor skills, fine motor skills, problem solving, and personal-social skills. The age-appropriate questionnaire is completed by the parent or caregiver (http://agesandstages.com).
† A series of nine age-appropriate parent-completed questionnaires designed to screen young children for social-emotional issues during the first 6 years of life for seven social-emotional areas: self-regulation, compliance, adaptive functioning, autonomy, affect, social-communication, and interaction with people (http://agesandstages.com).
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TABLE 1. Growth measurements* of children aged 19–24 months with confirmed or probable congenital Zika virus infection†,§ and microcephaly classification at birth¶,** — Paraíba, Brazil, August–October 2017
|Male (n = 10)||Female (n = 9)|
|>3 SD below mean for age and sex§§||7 (70)||8 (89)|
|1–3 SD below mean for age and sex***||6 (60)||7 (78)|
|1 to >3 SD below mean for age and sex§§§||6 (60)||7 (78)|