Metz TD, Clifton RG, Hughes BL, Sandoval GJ, Grobman WA, Saade GR, et al. Disease severity and perinatal outcomes of pregnant patients with coronavirus disease 2019 (COVID-19). Obstet Gynecol. 2021;137:571–80. https://doi.org/10.1097/AOG.0000000000004339.
Metz TD, Collier C, Hollier LM. Maternal mortality from coronavirus disease 2019 (COVID-19) in the United States. Obstet Gynecol. 2020;136:313–6. https://doi.org/10.1097/AOG.0000000000004024.
Zambrano LD, Ellington S, Strid P, Galang RR, Oduyebo T, Tong VT, et al. Update: characteristics of symptomatic women of reproductive age with laboratory-confirmed SARS-CoV-2 infection by pregnancy status—United States, January 22–October 3, 2020. Morb Mortal Wkly Rep. 2020;69:1641–7. https://doi.org/10.15585/mmwr.mm6944e3.
Yan J, Guo J, Fan C, Juan J, Yu X, Li J, et al. Coronavirus disease 2019 in pregnant women: a report based on 116 cases. Am J Obstet Gynecol. 2020;223:111.e1–111.e14. https://doi.org/10.1016/j.ajog.2020.04.014.
Blitz MJ, Rochelson B, Minkoff H, Meirowitz NB, Prasannan L, London V, et al. Maternal mortality among women with coronavirus disease 2019 admitted to the intensive care unit. Am J Obstet Gynecol. 2020. https://doi.org/10.1016/j.ajog.2020.06.020.
Knight M, Bunch K, Vousden N, Morris E, Simpson N, Gale C, et al. Characteristics and outcomes of pregnant women admitted to hospital with confirmed SARS-CoV-2 infection in UK: national population-based cohort study. BMJ. 2020;369:m2107 https://doi.org/10.1136/bmj.m2107.
Ellington S, Strid P, Tong VT, Woodworth K, Galang RR, Zambrano LD, et al. Characteristics of women of reproductive age with laboratory-confirmed SARS-CoV-2 infection by pregnancy status—United States, January 22–June 7, 2020. Morb Mortal Wkly Rep. 2020;69:769–75. https://doi.org/10.15585/mmwr.mm6925a1.
Kim CNH, Hutcheon J, van Schalkwyk J, Marquette GP, Brown H, Money D, et al. Maternal outcome of pregnant women admitted to intensive care units for COVID-19. Am J Obstet Gynecol. 2020. https://doi.org/10.1016/j.ajog.2020.08.002.
Lokken EM, Taylor GG, Huebner EM, Vanderhoeven J, Hendrickson S, Coler B, et al. Higher severe acute respiratory syndrome coronavirus 2 infection rate in pregnant patients. Am J Obstet Gynecol. 2021;225:75.e1–75.e16. https://doi.org/10.1016/j.ajog.2021.02.011.
Hudak ML, Flannery DD, Barnette K, Getzlaff T, Gautam S, Dhudasia MB, et al. Maternal and newborn hospital outcomes of perinatal SARS-CoV-2 infection: a national registry. Pediatrics. 2023;151:e2022059595. https://doi.org/10.1542/peds.2022-059595.
Mullins E, Perry A, Banerjee J, Townson J, Grozeva D, Milton R, et al. Pregnancy and neonatal outcomes of COVID-19: the PAN-COVID study. Eur J Obstet Gynecol Reprod Biol. 2022;276:161–7. https://doi.org/10.1016/j.ejogrb.2022.07.010.
Villar J, Ariff S, Gunier RB, Thiruvengadam R, Rauch S, Kholin A, et al. Maternal and neonatal morbidity and mortality among pregnant women with and without COVID-19 infection: the INTERCOVID multinational cohort study. JAMA Pediatr. 2021;175:817–26. https://doi.org/10.1001/jamapediatrics.2021.1050.
Centers for Disease Control and Prevention. COVID data tracker: data on COVID-19 during pregnancy: birth and infant outcomes. 2021. https://covid.cdc.gov/covid-data-tracker/#pregnant-birth-infant.
Galang RR, Newton SM, Woodworth KR, Griffin I, Oduyebo T, Santharam V, et al. Risk factors for illness severity among pregnant women with confirmed SARS-CoV-2 infection—Surveillance for Emerging Threats to Mothers and Babies Network, 22 state, local, and territorial health departments, 29 March 2020–5 March 2021. Clin Infect Dis. 2021;73:S17–S23. https://doi.org/10.1093/cid/ciab432.
Metz TD, Clifton RG, Hughes BL, Sandoval GJ, Grobman WA, Saade GR, et al. Association of SARS-CoV-2 infection with serious maternal morbidity and mortality from obstetric complications. JAMA. 2022;327:748–59. https://doi.org/10.1001/jama.2022.1190.
Beate D. Probabilistic record linkages for generating a comprehensive epidemiological research file on maternal and infant health. 2002. http://www.health-info-solutions.com/Probabilistic%20Record%20Linkages%20may%202002.pdf
COVID-19 Treatment Guidelines Panel. Coronavirus disease 2019 (COVID-19) treatment guidelines. National Institutes of Health. 2021. https://www.covid19treatmentguidelines.nih.gov/.
Centers for Disease Control and Prevention. Severe maternal morbidity indicators and corresponding ICD codes during delivery hospitalizations. 2021. https://www.cdc.gov/reproductivehealth/maternalinfanthealth/smm/severe-morbidity-ICD.htm.
The Joint Commission. Measure PC-06.1 (NQF 716). 2018. https://manual.jointcommission.org/releases/TJC2018B/MIF0393.html.
Zhao K Proper estimation of relative risk using PROC GENMOD in population studies. In: Proceedings of the SAS Global Forum 2013 Conference. Cary, NC: SAS Institute Inc.
Leonard SA, Kennedy CJ, Carmichael SL, Main EK. An expanded obstetric comorbidity scoring system for predicting severe maternal morbidity. Obstet Gynecol. 2020;136:440–9.
Ko JY, DeSisto CL, Simeone RM, Ellington S, Galang RR, Oduyebo T, et al. Adverse pregnancy outcomes, maternal complications, and severe illness among US delivery hospitalizations with and without a coronavirus disease 2019 (COVID-19) diagnosis. Clin Infect Dis. 2021;73:S24–S31. https://doi.org/10.1093/cid/ciab344.
Jering KS, Claggett BL, Cunningham JW, Rosenthal N, Vardeny O, Greene MF, et al. Clinical characteristics and outcomes of hospitalized women giving birth with and without COVID-19. JAMA Intern Med. 2021;181:714–7. https://doi.org/10.1001/jamainternmed.2020.9241.
Macias Gil R, Marcelin JR, Zuniga-Blanco B, Marquez C, Mathew T, Piggott DA. COVID-19 pandemic: disparate health impact on the Hispanic/Latinx population in the United States. J Infect Dis. 2020;222:1592–5. https://doi.org/10.1093/infdis/jiaa474.
Velasco-Huerta F, Ramirez EG, Payén SS, Alvarez A, Ottosen MJ, Hernandez DC. Social determinants of health and Latinx families, risk for COVID-19 infection. Fam Community Health. 2021;44:99–101. https://doi.org/10.1097/FCH.0000000000000289.
Main EK, Chang SC, Carpenter AM, Wise PH, Stevenson DK, Shaw GM. Singleton preterm birth rates for racial and ethnic groups during the coronavirus disease 2019 pandemic in California. Am J Obstet Gynecol. 2021;224:239–41.
Centers for Disease Control and Prevention. COVID-19 vaccination among pregnant people aged 18–49 years by race/ethnicity and date reported—Vaccine Safety Datalink, United States. 2025. https://www.cdc.gov.
Razzaghi H, Meghani M, Pingali C, Crane BE, Naleway AL, Weintraub E, et al. COVID-19 vaccination coverage among pregnant women during pregnancy—eight integrated health care organizations, United States, December 14, 2020–May 8, 2021. Morb Mortal Wkly Rep. 2021;70:895–9. https://doi.org/10.15585/mmwr.mm7024e2.
Brillo E, Tosto V, Gerli S, Laganà AS, Vitale SG, Zullo F, et al. COVID-19 vaccination in pregnancy and postpartum. J Matern Fetal Neonatal Med. 2021:1–21. https://doi.org/10.1080/14767058.2021.1937991.
Adhikari EH, SoRelle JA, McIntire DD, Spong CY. Increasing severity of COVID-19 in pregnancy with Delta (B.1.617.2) variant surge. Am J Obstet Gynecol. 2021. https://doi.org/10.1016/j.ajog.2021.09.008.
Yao R, Martin CB, Haase VS. Initial clinical characteristics of gravid severe acute respiratory syndrome coronavirus 2-positive patients and the risk of progression to severe coronavirus disease 2019. Am J Obstet Gynecol MFM. 2021;3:100365. https://doi.org/10.1016/j.ajogmf.2021.100365.
