1171. Measles and Rubella Seroprevalence among HIV-infected and uninfected Children and Adults in Zambia

Abstract

Session: P-68. Pediatric Maternal-child infections Background. Congenital syphilis is a chronic infection acquired by the fetus in utero from a mother infected with Treponema palladium. It has a large spectrum of disease manifestations from asymptomatic infection to blindness, abnormal bone and teeth formation, deafness, or even death. Despite antenatal screening and the availability of effective treatment the incidence of congenital syphilis has risen since 2012, with 23.3 cases per 100,000 live births in 2017 according to the Centers for Disease Control. We sought to investigate the epidemiology, clinical manifestations, and treatment outcomes of congenital syphilis. Methods. We undertook a retrospective review of individuals born at Texas Children's Hospital from January 1, 2010 to May 15, 2021 to evaluate compliance with current diagnostic and treatment recommendations. Diagnostic and billing codes for congenital syphilis were used to generate a list of subjects. Patient demographics and clinical details were abstracted from the electronic medical record (EMR). Statistics were performed using Microsoft Excel. Results. 107 children (52% male, 48% female) were identified from diagnostic and billing codes in the EMR under the SNOMED-CT diagnosis of "congenital syph-ilis" and were less than two years of age at the time of diagnosis. All received penicillin within one month of diagnosis. 94 of these had a skeletal x-ray performed, with 11 (12%) having an abnormal skeletal x-ray consistent with congenital syphilis. 88 (82%) had a lumbar puncture done with a quantitative CSF VDRL obtained. 88 received aqueous penicillin G for proven/highly probable or possible syphilis. Four patients were deceased at the time of data inquiry. Of those with abnormal skeletal x-rays, "met-aphyseal lucency" was the most common finding. Conclusion. Congenital syphilis remains a significant concern in the United States and carries the risk of significant long-term morbidity for infants and children. Antenatal screening with appropriate treatment in pregnancy and adequate follow-up would decrease the need for neonatal evaluation and treatment. Session: P-69. Pediatric Vaccines Background. Rotavirus causes 215,000 deaths from severe childhood diarrhea annually. Two rotavirus vaccines-a monovalent vaccine containing a single rotavirus strain (RV1) and a pentavalent vaccine containing 5 rotavirus strains (RV5)-are used in routine immunization programs of nearly 100 countries. Concerns exist that rota-virus vaccines may be less effective against rotavirus strains not contained in the vaccines which could subsequently cause selective pressure and strain replacement. We estimated the vaccine effectiveness (VE) of RV1 and RV5 against vaccine (homotypic) and non-vaccine (partially and fully heterotypic) strains. Methods. After conducting a systematic review, we meta-analyzed 31 case-control studies (N=27,293) conducted between 2006 and 2020 using a random-effect regression model. Results. In high-income countries, RV1 VE was 10% lower against partially heterotypic (p-value=0.04) and fully heterotypic (p-value=0.10) compared to homotypic strains (homotypic VE: 90% [95% CI: 82, 94]; partially heterotypic VE: 79% [95% CI: 71, 85]; fully heterotypic VE: 80% [95% CI: 65, 88]; Figure 1). In middle-income countries, RV1 VE was 14 to 16% lower against partially hetero-typic (p-value=0.06) and fully heterotypic (p-value=0.04) compared to homotypic strains (homotypic VE: 81% [95% CI: 69, 88]; partially heterotypic VE: 67% [95% CI: 54, 76]; fully heterotypic VE: 65% [95% CI: 52, 75]; Figure 1). Strain-specific RV5 VE differences were less pronounced (Figure 2). Limited data were available from low-income countries. Figure 1. Vaccine effectiveness by country income level and strain type, for RV1. Figure 2. Vaccine effectiveness by country income level and strain type, for RV5. Conclusion. Vaccine effectiveness of RV1 and RV5 was somewhat lower VE against non-vaccine than vaccine strains. Ongoing surveillance is crucial to continue long-term monitoring for strain replacement, particularly in low-income settings where data are limited. Session: P-69. Pediatric Vaccines Background. Despite the availability of safe and effective vaccines, measles and congenital rubella syndrome remain important causes of morbidity and mortality. HIV-infected individuals may be more vulnerable to measles because of poor immune responses to vaccination. Population-level estimates and comparisons of measles and