SSB Part B 09JUN2017

ZEN Colombia Study

Zika in Pregnant Women and Children in Colombia

Supporting Statement: Part B

May 19, 2017

Suzanne Gilboa, PhD

Telephone: 404-498-4425

Fax: 404-498-3550

E-mail: suz0@cdc.gov

Pregnancy and Birth Defects Task Force

CDC Zika Virus Response Team

Centers for Disease Control and Prevention

Atlanta, Georgia 30341

Table of Contents

B. Collections of Information Employing Statistical Methods

1. Respondent Universe and Sampling Methods

2. Procedures for the Collection of Information

3. Methods to Maximize Response Rates and Deal with Non-response

4. Tests of Procedures or Methods to be Undertaken

5. Individuals Consulted on Statistical Aspects and Individuals Collecting and/or Analyzing Data

B. Collections of Information Employing Statistical Methods

B.1. Respondent Universe and Sampling Methods

A causal link has been established between Zika virus (ZIKV) infection in pregnancy and microcephaly and other severe fetal brain defects. CDC surveillance and research efforts are underway in the United States (U.S.) (including territories, particularly Puerto Rico), Brazil, and Colombia to understand the range of other adverse pregnancy and infant outcomes associated with Zika infection during pregnancy. However, there are key knowledge gaps that cannot be addressed using surveillance data or retrospective data. Thus, there is an urgent need to prospectively study pregnant women in areas of high Zika virus transmission in order to contribute to understanding of risk factors for ZIKV infection in pregnant women and their infants, to estimate the absolute and relative risk for adverse maternal, fetal, and infant outcomes associated with ZIKV infection, and to identify modifiers of the risk for adverse outcomes among pregnant women and their infants following ZIKV infection. Colombia’s Instituto Nacional de Salud (INS) and the U.S. Centers for Disease Control and Prevention (CDC) will conduct a prospective cohort study designed to answer these questions, many of which cannot be addressed with data from surveillance systems or retrospective studies because of the need to identify the timing of asymptomatic infections and to enumerate the underlying base population.

The target for the ZEN Colombia study enrollment is 5,000 pregnant women, up to 1,250 male partners, and 4,500 newborns. This assumes a 25% participation rate among male partners and that 90% of infants are live born. Women will be enrolled from multiple sites across the country including clinics in Barranquilla, Bucaramanga, and Tulua, and possibly Ibague, and/or Giraldo. The final decision of specific clinics to be included in the study will be made by INS. The use of multiple sites will increase the study’s generalizability.

Participating pregnant women will be screened for eligibility and enrolled until a sample size of 5,000 is achieved. As shown in Figure B1, our planned sample size of 5,000 corresponds to 80% power to detect a risk ratio of 50 for the association between ZIKV infection in pregnancy and microcephaly, assuming an infection rate of 10% in the cohort and a baseline risk of microcephaly of 2 per 10,000 births. In addition to allowing our study to confirm the magnitude of association with microcephaly seen in other studies, this sample size will also allow us to assess a variety of other potential outcomes. Figure B1 displays the power (y-axis) over a range of minimum detectable risk ratios (x-axis) for scenarios defined by the background prevalence of the outcome and the prevalence of Zika virus infection among our study population. Specifically, the outcome of preterm birth (baseline risk is approximately 10% in Colombia¹), hearing loss (estimated to occur in 3/1,000 newborns in at least one sample in Bogota, Colombia.²), and microcephaly are considered in the figure. Because the prevalence of Zika virus infection during the second wave of the epidemic is unknown, power was estimated for a variety of prevalences – 5%, 10%, and 20%. Our sample size would allow us to detect a risk ratio of at least 1.6 for preterm birth, assuming a ZIKV infection rate of 5% or greater. Assuming a baseline ZIKV infection rate of 20%, our sample size would allow us to detect an association between ZIKV and hearing loss with a risk ratio of 3.9. While our study may be underpowered to detect significant associations after stratifying by trimester of pregnancy or symptom status, a cohort study is the only type of study that will allow us to better understand the spectrum of potential effects of ZIKV infection in pregnancy, including those associated with specific timing of asymptomatic infection during pregnancy, which cannot be ascertained using surveillance data or retrospective study designs. Future studies could subsequently be conducted to confirm and refine the associations observed in this study.

Figure B1. Study power by minimum detectable risk ratio, for varying Zika virus infection rates and outcome prevalence. Markers depict estimated power for the following outcomes: preterm birth (A), hearing loss (B), and microcephaly (C)

Notes: Assuming a significance level of 0.05 and total sample size of 5,000 women

^* Proportion of study cohort with incident ZIKV infection

^† Expected number of women exposed to ZIKV in pregnancy

B.2. Procedures for the Collection of Information

Pregnant women will be recruited in the first trimester of pregnancy at participating clinics in Colombia’s private and public health care systems and followed through their pregnancy, delivery, and immediate post-partum period. The Pregnant Woman Eligibility Screener Form (Att B.1; C.1), administered to potential participants by trained ZEN research staff, will be used to confirm participant eligibility prior to consent or assent. At the enrollment visit, study staff will interview pregnant women using the Pregnant Woman Enrollment Questionnaire (Att B.2; C.2) and an Adult Symptoms Questionnaire (Att B.5; C.5). All pregnant women will attend monthly study clinic visits and will be interviewed using the Maternal Follow-Up (Att B.3; C.3) and Adult Symptoms Questionnaires (Att B.5; C.5). Pregnant women will have interval visits (about two weeks after clinic visits) where they will be monitored for incident ZIKV infection by collection of urine and be interviewed using the Adult Symptoms Questionnaire (Att B.5; C.5), until the middle of the third trimester (approximately 32 weeks gestation). If a woman is confirmed to have ZIKV, she will be interviewed using an Adult Symptoms Questionnaire (Att B.5; C.5) every 2 weeks and Maternal Follow-Up Questionnaire every month (Att B.3; C.3) until she is negative for 2 consecutive blood samples. If a woman has a spontaneous fetal demise, she will be interviewed using an Adult Symptoms Questionnaire (Att B.5; C.5), if one has not been completed within 7 days prior to the event. At delivery or within 10 days postpartum, the mother will be interviewed using the Infant Symptoms (Att B.6; C.6), Adult Symptoms (Att B.5; C.5), and Maternal Follow-Up (Att B.3; C.3) Questionnaires.

Infants of mothers participating in the study will be followed from birth to 6 months of age to detect health outcomes that might not have been detectable at birth. Mothers will be interviewed using the Infant Symptoms Questionnaire (Att B.6; C.6) at each visit and Ages and Stages Questionnaires (Att B.8; B.9; C.8; C.9) at at the 2 and 6 month visit. If an infant is confirmed to have ZIKV, the mother be interviewed using the Infant Symptoms Questionnaire (Att B.6; C.6).

In addition to administered questionnaires, ZEN Colombia study staff will abstract medical records from mothers’ prenatal care, sick visits, and delivery to capture relevant medical information. Mothers’ medical record abstraction will be conducted up to 6 months after delivery to collect information on post-partum medical issues. Staff will also abstract medical records from children enrolled in the study to obtain information on diagnoses, test results, medical procedures, and hospitalizations up to 6 months of age.

Male partners will be recruited via their pregnant partners around the time of their partners’ enrollment into the study. The Male Partner Eligibility Screener Form (Att B.7; C.7), administered to potential participants by trained ZEN research staff, will be used to confirm participant eligibility prior to consent. At enrollment, men will provide a blood sample and will be interviewed using the Male Enrollment Questionnaire (Att B.4; C.4) and Adult Symptoms Questionnaire (Att B.5; C.5). Men will provide urine samples monthly through the second trimester of their partner’s pregnancy (about 27 weeks of gestation) to monitor for incident ZIKV infection and will be interviewed using the Adult Symptoms Questionnaire (Att B.5; C.5) at the time of each specimen collection. If the male partner is confirmed to have ZIKV, semen will be collected every 2 weeks until semen is negative for ZIKV for two consecutive semen samples or until the partner’s pregnancy ends and men will be interviewed using the Adult Symptoms Questionnaire (Att B.5; C.5). If a man does not want to provide semen samples, follow-up will be discontinued. Study staff will also abstract medical records for male partner’s sick visits.

B.3. Methods to Maximize Response Rates and Deal with Non-response

Efforts will be made to maximize the response rate. Participants will be encouraged to complete the study throughout the pregnancy and 6 months following the infant delivery, with the exception of pregnancies that end in fetal loss. Participating and completing the study is imperative to better understand the effect of ZIKV infection during pregnancy. To encourage study participation, after being provided with information about the study, potential participants will be given a phone number to call if he or she has questions about the study. In addition, once a participant is enrolled, study staff will follow-up with participants if a study visit is missed.

There are also a number of ancillary benefits to study participation that are expected to increase participation rates. As a part of this study, participants will have some tests and procedures performed that are not usually available in the standard prenatal care, including serial Zika testing, blood, and urine diagnostic testing. These tests are likely to result in timely detection of asymptomatic infections and timely confirmation of symptomatic infections. Additionally, both the woman and her male partner will benefit from receiving information and counseling on the health effects they might expect for their infant, and the infant will benefit from being eligible to take part in services and screening recommended for children born to ZIKV-positive mothers. ZIKV study-related tests will be paid for by the study as they are not part of the routine clinical care. Participants will also be given any new information gained during the course of the study that might increase their willingness to continue with the study.

Participants may be provided a transportation cost that covers expenses incurred for travel and for meals consistent with the local economy. The cost value will range from 0 to 20,000 Colombian pesos (~0-7 USD) for any single trip and 0 to 12,000 pesos (~0-3 USD) for meals. These may be given to the participants in the form of cash, transportation tickets, or as determined by the cities as appropriate and within guidelines.

We anticipate being able to assess non-response bias by examining participation rates by city and also by clinic. In addition, some information on non-responders may be available from clinics so that we will be able to assess factors associated with non-response.

B.4. Tests of Procedures or Methods to be Undertaken

All data collection instruments were reviewed by medical personnel, laboratorians, epidemiologists and subject matter experts for question wording and appropriate and adequate response options. In collaboration with the Instituto Nacional de Salud (INS), CDC plans to pilot test all data collection instruments, including data entry, data editing, and data management for ZEN Colombia study. Results from the pilot test will provide opportunity to refine and revise questions to minimize burden and improve efficacy.

B.5. Individuals Consulted on Statistical Aspects and Individuals Collecting and/or Analyzing Data

Data collection instruments were reviewed by medical personnel, laboratorians, epidemiologists and subject matter experts. These included individuals from the CDC Zika Virus Response Team, Pregnancy and Birth Defects Task Force (Margaret Honein, PhD; Denise Jamieson, MD; Diana Valencia, MS, MS; Carol Rao, ScD; Elizabeth Ailes, PhD; Sherry Farr, PhD; Suzanne Gilboa, PhD; Candice Johnson, PhD; Jennita Reefhuis, PhD; Christina Renquist, MPH; Andrea Sharma, PhD; Van Tong, MPH; Sarah Tinker, PhD; Julie Villanueva, PhD; Shin Kim, MPH; Kayla Anderson, PhD), Emory University (Lisa Haddad, MD) and Colombia INS (Martha Lucia Ospina Martínez, MD; Jorge Martin Rodriguez, MD, MSc; Yamileth Ortiz Gomez, Bg, MSc; Marcela Mercado, Bact, MSc; Maritza Gonzalez, MD, MSc; May Bibiana Osorio Merchan, MSc).

ZEN Colombia Study designed by:

Pregnancy and Birth Defects Task Force

CDC Zika Virus Response Team

U.S. Centers for Disease Control and Prevention

Centers for Disease Control and Prevention

1600 Clifton Rd., NE

Atlanta, GA 30303

Tel: 770-488-7100

Project Officer: Margaret Honein

E-mail: mrh7@cdc.gov

Instituto Nacional de Salud (INS)

Av. Calle 26 No. 51-20

Bogota, D.C., Colombia

Commutador: (1) 220-7700 Ext. 1703-1704

Fax: (1) 220-7700 Ext. 1283-1269

Directora General: Martha Lucia Ospina Martínez

E-mail: mospina@ins.gov.co

Data collected from 2016-2017 by:

Vysnova Partners, Inc.

1901 Research Blvd. Suite 502

Rockville, MD 20850

Pregnancy and Birth Defects Task Force

CDC Zika Virus Response Team

U.S. Centers for Disease Control and Prevention

Centers for Disease Control and Prevention

1600 Clifton Rd., NE

Atlanta, GA 30303

Tel: 770-488-7100

Project Officer: Margaret Honein

E-mail: mrh7@cdc.gov

Instituto Nacional de Salud (INS)

Av. Calle 26 No. 51-20

Bogota, D.C., Colombia

Commutador: (1) 220-7700 Ext. 1703-1704

Fax: (1) 220-7700 Ext. 1283-1269

Directora General: Martha Lucia Ospina Martínez

E-mail: mospina@ins.gov.co

Data analyzed by:

Pregnancy and Birth Defects Task Force

CDC Zika Virus Response Team

U.S. Centers for Disease Control and Prevention

Centers for Disease Control and Prevention

1600 Clifton Rd., NE

Atlanta, GA 30303

Tel: 770-488-7100

Project Officer: Margaret Honein

E-mail: mrh7@cdc.gov

Instituto Nacional de Salud (INS)

Av. Calle 26 No. 51-20

Bogota, D.C., Colombia

Commutador: (1) 220-7700 Ext. 1703-1704

Fax: (1) 220-7700 Ext. 1283-1269

Directora General: Martha Lucia Ospina Martínez

E-mail: mospina@ins.gov.co

1 Born too Soon: The Global Action Report on Preterm Birth. ww.who.int/pmnch/media/news/2012/preterm_birth_report/en/index.html

2 Rojas, J. A., J. E. Bernal, M. A. Garcia, I. Zarante, N. Ramirez, C. Bernal, N. Gelvez and M. L. Tamayo (2014). "Transient evoked oto-acoustic emission screening in newborns in Bogota, Colombia: a retrospective study." Int J Pediatr Otorhinolaryngol 78(10): 1752-1755.

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