Browsing by Author "Reynolds, Sue"

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    Effectiveness of 2-Dose Vaccination with mRNA COVID-19 Vaccines Against COVID-19–Associated Hospitalizations Among Immunocompromised Adults — Nine States, January–September 2021
    (CDC, 2021-11) Embi, Peter J.; Levy, Matthew E.; Naleway, Allison L.; Patel, Palak; Gaglani, Manjusha; Natarajan, Karthik; Dascomb, Kristin; Ong, Toan C.; Klein, Nicola P.; Liao, I-Chia; Grannis, Shaun J.; Han, Jungmi; Stenehjem, Edward; Dunne, Margaret M.; Lewis, Ned; Irving, Stephanie A.; Rao, Suchitra; McEvoy, Charlene; Bozio, Catherine H.; Murthy, Kempapura; Dixon, Brian E.; Grisel, Nancy; Yang, Duck-Hye; Goddard, Kristin; Kharbanda, Anupam B.; Reynolds, Sue; Raiyani, Chandni; Fadel, William F.; Arndorfer, Julie; Rowley, Elizabeth A.; Fireman, Bruce; Ferdinands, Jill; Valvi, Nimish R.; Ball, Sarah W.; Zerbo, Ousseny; Griggs, Eric P.; Mitchell, Patrick K.; Porter, Rachael M.; Kiduko, Salome A.; Blanton, Lenee; Zhuang, Yan; Steffens, Andrea; Reese, Sarah E.; Olson, Natalie; Williams, Jeremiah; Dickerson, Monica; McMorrow, Meredith; Schrag, Stephanie J.; Verani, Jennifer R.; Fry, Alicia M.; Azziz-Baumgartner, Eduardo; Barron, Michelle A.; Thompson, Mark G.; DeSilva, Malini B.; Medicine, School of Medicine
    What is already known about this topic? Studies suggest that immunocompromised persons who receive COVID-19 vaccination might not develop high neutralizing antibody titers or be as protected against severe COVID-19 outcomes as are immunocompetent persons. What is added by this report? Effectiveness of mRNA vaccination against laboratory-confirmed COVID-19–associated hospitalization was lower (77%) among immunocompromised adults than among immunocompetent adults (90%). Vaccine effectiveness varied considerably among immunocompromised patient subgroups. What are the implications for public health practice? Immunocompromised persons benefit from COVID-19 mRNA vaccination but are less protected from severe COVID-19 outcomes than are immunocompetent persons. Immunocompromised persons receiving mRNA COVID-19 vaccines should receive 3 doses and a booster, consistent with CDC recommendations, practice nonpharmaceutical interventions, and, if infected, be monitored closely and considered early for proven therapies that can prevent severe outcomes.
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    Effectiveness of a Third Dose of mRNA Vaccines Against COVID-19–Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults During Periods of Delta and Omicron Variant Predominance — VISION Network, 10 States, August 2021–January 2022
    (U.S. Department of Health & Human Services, 2022-01-28) Thompson, Mark G.; Natarajan, Karthik; Irving, Stephanie A.; Rowley, Elizabeth A.; Griggs, Eric P.; Gaglani, Manjusha; Klein, Nicola P.; Grannis, Shaun J.; DeSilva, Malini B.; Stenehjem, Edward; Reese, Sarah E.; Dickerson, Monica; Naleway, Allison L.; Han, Jungmi; Konatham, Deepika; McEvoy, Charlene; Rao, Suchitra; Dixon, Brian E.; Dascomb, Kristin; Lewis, Ned; Levy, Matthew E.; Patel, Palak; Liao, I-Chia; Kharbanda, Anupam B.; Barron, Michelle A.; Fadel, William F.; Grisel, Nancy; Goddard, Kristin; Yang, Duck-Hye; Wondimu, Mehiret H.; Murthy, Kempapura; Valvi, Nimish R.; Arndorfer, Julie; Fireman, Bruce; Dunne, Margaret M.; Embi, Peter; Azziz-Baumgartner, Eduardo; Zerbo, Ousseny; Bozio, Catherine H.; Reynolds, Sue; Ferdinands, Jill; Williams, Jeremiah; Link-Gelles, Ruth; Schrag, Stephanie J.; Verani, Jennifer R.; Ball, Sarah; Ong, Toan C.; Family Medicine, School of Medicine
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    Effectiveness of COVID-19 Pfizer-BioNTech BNT162b2 mRNA Vaccination in Preventing COVID-19–Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Nonimmunocompromised Children and Adolescents Aged 5–17 Years — VISION Network, 10 States, April 2021–January 2022
    (Centers for Disease Control and Prevention, 2022-03-04) Klein, Nicola P.; Stockwell, Melissa S.; Demarco, Maria; Gaglani, Manjusha; Kharbanda, Anupam B.; Irving, Stephanie A.; Rao, Suchitra; Grannis, Shaun J.; Dascomb, Kristin; Murthy, Kempapura; Rowley, Elizabeth A.; Dalton, Alexandra F.; DeSilva, Malini B.; Dixon, Brian E.; Natarajan, Karthik; Stenehjem, Edward; Naleway, Allison L.; Lewis, Ned; Ong, Toan C.; Patel, Palak; Konatham, Deepika; Embi, Peter J.; Reese, Sarah E.; Han, Jungmi; Grisel, Nancy; Goddard, Kristin; Barron, Michelle A.; Dickerson, Monica; Liao , I-Chia; Fadel, William F.; Yang, Duck-Hye; Arndorfer, Julie; Fireman, Bruce; Griggs, Eric P.; Valvi, Nimish R.; Hallowell, Carly; Zerbo, Ousseny; Reynolds, Sue; Ferdinands, Jill; Wondimu, Mehiret H.; Williams, Jeremiah; Bozio, Catherine H.; Link-Gelles, Ruth; Azziz-Baumgartner, Eduardo; Schrag, Stephanie J.; Thompson, Mark G.; Verani, Jennifer R.; Family Medicine, School of Medicine
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    Effectiveness of COVID-19 vaccines at preventing emergency department or urgent care encounters and hospitalizations among immunocompromised adults: An observational study of real-world data across 10 US states from August-December 2021
    (Elsevier, 2023) Embi, Peter J.; Levy, Matthew E.; Patel, Palak; DeSilva, Malini B.; Gaglani, Manjusha; Dascomb, Kristin; Dunne, Margaret M.; Klein, Nicola P.; Ong, Toan C.; Grannis, Shaun J.; Natarajan, Karthik; Yang, Duck-Hye; Stenehjem, Edward; Zerbo, Ousseny; McEvoy, Charlene; Rao, Suchitra; Thompson, Mark G.; Konatham, Deepika; Irving, Stephanie A.; Dixon, Brian E.; Han, Jungmi; Schrader, Kristin E.; Grisel, Nancy; Lewis, Ned; Kharbanda, Anupam B.; Barron, Michelle A.; Reynolds, Sue; Liao, I-Chia; Fadel, William F.; Rowley, Elizabeth A.; Arndorfer, Julie; Goddard, Kristin; Murthy, Kempapura; Valvi, Nimish R.; Weber, Zachary A.; Fireman, Bruce; Reese, Sarah E.; Ball, Sarah W.; Naleway, Allison L.; Medicine, School of Medicine
    Background: Immunocompromised (IC) persons are at increased risk for severe COVID-19 outcomes and are less protected by 1-2 COVID-19 vaccine doses than are immunocompetent (non-IC) persons. We compared vaccine effectiveness (VE) against medically attended COVID-19 of 2-3 mRNA and 1-2 viral-vector vaccine doses between IC and non-IC adults. Methods: Using a test-negative design among eight VISION Network sites, VE against laboratory-confirmed COVID-19-associated emergency department (ED) or urgent care (UC) events and hospitalizations from 26 August-25 December 2021 was estimated separately among IC and non-IC adults and among specific IC condition subgroups. Vaccination status was defined using number and timing of doses. VE for each status (versus unvaccinated) was adjusted for age, geography, time, prior positive test result, and local SARS-CoV-2 circulation. Results: We analyzed 8,848 ED/UC events and 18,843 hospitalizations among IC patients and 200,071 ED/UC events and 70,882 hospitalizations among non-IC patients. Among IC patients, 3-dose mRNA VE against ED/UC (73% [95% CI: 64-80]) and hospitalization (81% [95% CI: 76-86]) was lower than that among non-IC patients (ED/UC: 94% [95% CI: 93-94]; hospitalization: 96% [95% CI: 95-97]). Similar patterns were observed for viral-vector vaccines. Transplant recipients had lower VE than other IC subgroups. Conclusions: During B.1.617.2 (Delta) variant predominance, IC adults received moderate protection against COVID-19-associated medical events from three mRNA doses, or one viral-vector dose plus a second dose of any product. However, protection was lower in IC versus non-IC patients, especially among transplant recipients, underscoring the need for additional protection among IC adults.
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    Effectiveness of Covid-19 Vaccines in Ambulatory and Inpatient Care Settings
    (Massachusetts Medical Society, 2021-10-07) Thompson, Mark G.; Stenehjem, Edward; Grannis, Shaun; Ball, Sarah W.; Naleway, Allison L.; Ong, Toan C.; DeSilva, Malini B.; Natarajan, Karthik; Bozio, Catherine H.; Lewis, Ned; Dascomb, Kristin; Dixon, Brian E.; Birch, Rebecca J.; Irving, Stephanie A.; Rao, Suchitra; Kharbanda, Elyse; Han, Jungmi; Reynolds, Sue; Goddard, Kristin; Grisel, Nancy; Fadel, William F.; Levy, Matthew E.; Ferdinands, Jill; Fireman, Bruce; Arndorfer, Julie; Valvi, Nimish R.; Rowley, Elizabeth A.; Patel, Palak; Zerbo, Ousseny; Griggs, Eric P.; Porter, Rachael M.; Demarco, Maria; Blanton, Lenee; Steffens, Andrea; Zhuang, Yan; Olson, Natalie; Barron, Michelle; Shifflett, Patricia; Schrag, Stephanie J.; Verani, Jennifer R.; Fry, Alicia; Gaglani, Manjusha; Azziz-Baumgartner, Eduardo; Klein, Nicola P.; Family Medicine, School of Medicine
    BACKGROUND There are limited data on the effectiveness of the vaccines against symptomatic coronavirus disease 2019 (Covid-19) currently authorized in the United States with respect to hospitalization, admission to an intensive care unit (ICU), or ambulatory care in an emergency department or urgent care clinic. METHODS We conducted a study involving adults (≥50 years of age) with Covid-19–like illness who underwent molecular testing for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). We assessed 41,552 admissions to 187 hospitals and 21,522 visits to 221 emergency departments or urgent care clinics during the period from January 1 through June 22, 2021, in multiple states. The patients’ vaccination status was documented in electronic health records and immunization registries. We used a test-negative design to estimate vaccine effectiveness by comparing the odds of a positive test for SARS-CoV-2 infection among vaccinated patients with those among unvaccinated patients. Vaccine effectiveness was adjusted with weights based on propensity-for-vaccination scores and according to age, geographic region, calendar time (days from January 1, 2021, to the index date for each medical visit), and local virus circulation. RESULTS The effectiveness of full messenger RNA (mRNA) vaccination (≥14 days after the second dose) was 89% (95% confidence interval [CI], 87 to 91) against laboratory-confirmed SARS-CoV-2 infection leading to hospitalization, 90% (95% CI, 86 to 93) against infection leading to an ICU admission, and 91% (95% CI, 89 to 93) against infection leading to an emergency department or urgent care clinic visit. The effectiveness of full vaccination with respect to a Covid-19–associated hospitalization or emergency department or urgent care clinic visit was similar with the BNT162b2 and mRNA-1273 vaccines and ranged from 81% to 95% among adults 85 years of age or older, persons with chronic medical conditions, and Black or Hispanic adults. The effectiveness of the Ad26.COV2.S vaccine was 68% (95% CI, 50 to 79) against laboratory-confirmed SARS-CoV-2 infection leading to hospitalization and 73% (95% CI, 59 to 82) against infection leading to an emergency department or urgent care clinic visit. CONCLUSIONS Covid-19 vaccines in the United States were highly effective against SARS-CoV-2 infection requiring hospitalization, ICU admission, or an emergency department or urgent care clinic visit. This vaccine effectiveness extended to populations that are disproportionately affected by SARS-CoV-2 infection. Methods: We conducted a study involving adults (≥50 years of age) with Covid-19-like illness who underwent molecular testing for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). We assessed 41,552 admissions to 187 hospitals and 21,522 visits to 221 emergency departments or urgent care clinics during the period from January 1 through June 22, 2021, in multiple states. The patients' vaccination status was documented in electronic health records and immunization registries. We used a test-negative design to estimate vaccine effectiveness by comparing the odds of a positive test for SARS-CoV-2 infection among vaccinated patients with those among unvaccinated patients. Vaccine effectiveness was adjusted with weights based on propensity-for-vaccination scores and according to age, geographic region, calendar time (days from January 1, 2021, to the index date for each medical visit), and local virus circulation. Results: The effectiveness of full messenger RNA (mRNA) vaccination (≥14 days after the second dose) was 89% (95% confidence interval [CI], 87 to 91) against laboratory-confirmed SARS-CoV-2 infection leading to hospitalization, 90% (95% CI, 86 to 93) against infection leading to an ICU admission, and 91% (95% CI, 89 to 93) against infection leading to an emergency department or urgent care clinic visit. The effectiveness of full vaccination with respect to a Covid-19-associated hospitalization or emergency department or urgent care clinic visit was similar with the BNT162b2 and mRNA-1273 vaccines and ranged from 81% to 95% among adults 85 years of age or older, persons with chronic medical conditions, and Black or Hispanic adults. The effectiveness of the Ad26.COV2.S vaccine was 68% (95% CI, 50 to 79) against laboratory-confirmed SARS-CoV-2 infection leading to hospitalization and 73% (95% CI, 59 to 82) against infection leading to an emergency department or urgent care clinic visit. Conclusions: Covid-19 vaccines in the United States were highly effective against SARS-CoV-2 infection requiring hospitalization, ICU admission, or an emergency department or urgent care clinic visit. This vaccine effectiveness extended to populations that are disproportionately affected by SARS-CoV-2 infection. (Funded by the Centers for Disease Control and Prevention.).
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    Effectiveness of Homologous and Heterologous COVID-19 Booster Doses Following 1 Ad.26.COV2.S (Janssen [Johnson & Johnson]) Vaccine Dose Against COVID-19-Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults - VISION Network, 10 States, December 2021-March 2022
    (Center for Disease Control, 2022-04-01) Natarajan, Karthik; Prasad, Namrata; Dascomb, Kristin; Irving, Stephanie A.; Yang, Duck-Hye; Gaglani, Manjusha; Klein, Nicola P.; DeSilva, Malini B.; Ong, Toan C.; Grannis, Shaun J.; Stenehjem, Edward; Link-Gelles, Ruth; Rowley, Elizabeth A.; Naleway, Allison L.; Han, Jungmi; Raiyani, Chandni; Vazquez Benitez, Gabriela; Rao, Suchitra; Lewis, Ned; Fadel, William F.; Grisel, Nancy; Griggs, Eric P.; Dunne, Margaret M.; Stockwell, Melissa S.; Mamawala, Mufaddal; McEvoy, Charlene; Barron, Michelle A.; Goddard, Kristin; Valvi, Nimish R.; Arndorfer, Julie; Patel, Palak; Mitchell, Patrick K.; Smith, Michael; Kharbanda, Anupam B.; Fireman, Bruce; Embi, Peter J.; Dickerson, Monica; Davis, Jonathan M.; Zerbo, Ousseny; Dalton, Alexandra F.; Wondimu, Mehiret H.; Azziz-Baumgartner, Eduardo; Bozio, Catherine H.; Reynolds, Sue; Ferdinands, Jill; Williams, Jeremiah; Schrag, Stephanie J.; Verani, Jennifer R.; Ball, Sarah; Thompson, Mark G.; Dixon, Brian E.; Community and Global Health, Richard M. Fairbanks School of Public Health
    CDC recommends that all persons aged ≥18 years receive a single COVID-19 vaccine booster dose ≥2 months after receipt of an Ad.26.COV2.S (Janssen [Johnson & Johnson]) adenovirus vector-based primary series vaccine; a heterologous COVID-19 mRNA vaccine is preferred over a homologous (matching) Janssen vaccine for booster vaccination. This recommendation was made in light of the risks for rare but serious adverse events following receipt of a Janssen vaccine, including thrombosis with thrombocytopenia syndrome and Guillain-Barré syndrome† (1), and clinical trial data indicating similar or higher neutralizing antibody response following heterologous boosting compared with homologous boosting (2). Data on real-world vaccine effectiveness (VE) of different booster strategies following a primary Janssen vaccine dose are limited, particularly during the period of Omicron variant predominance. The VISION Network§ determined real-world VE of 1 Janssen vaccine dose and 2 alternative booster dose strategies: 1) a homologous booster (i.e., 2 Janssen doses) and 2) a heterologous mRNA booster (i.e., 1 Janssen dose/1 mRNA dose). In addition, VE of these booster strategies was compared with VE of a homologous booster following mRNA primary series vaccination (i.e., 3 mRNA doses). The study examined 80,287 emergency department/urgent care (ED/UC) visits¶ and 25,244 hospitalizations across 10 states during December 16, 2021-March 7, 2022, when Omicron was the predominant circulating variant.** VE against laboratory-confirmed COVID-19-associated ED/UC encounters was 24% after 1 Janssen dose, 54% after 2 Janssen doses, 79% after 1 Janssen/1 mRNA dose, and 83% after 3 mRNA doses. VE for the same vaccination strategies against laboratory-confirmed COVID-19-associated hospitalizations were 31%, 67%, 78%, and 90%, respectively. All booster strategies provided higher protection than a single Janssen dose against ED/UC visits and hospitalizations during Omicron variant predominance. Vaccination with 1 Janssen/1 mRNA dose provided higher protection than did 2 Janssen doses against COVID-19-associated ED/UC visits and was comparable to protection provided by 3 mRNA doses during the first 120 days after a booster dose. However, 3 mRNA doses provided higher protection against COVID-19-associated hospitalizations than did other booster strategies during the same time interval since booster dose. All adults who have received mRNA vaccines for their COVID-19 primary series vaccination should receive an mRNA booster dose when eligible. Adults who received a primary Janssen vaccine dose should preferentially receive a heterologous mRNA vaccine booster dose ≥2 months later, or a homologous Janssen vaccine booster dose if mRNA vaccine is contraindicated or unavailable. Further investigation of the durability of protection afforded by different booster strategies is warranted.
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    Laboratory-Confirmed COVID-19 Among Adults Hospitalized with COVID-19–Like Illness with Infection-Induced or mRNA Vaccine-Induced SARS-CoV-2 Immunity — Nine States, January–September 2021
    (CDC, 2021-11) Bozio, Catherine H.; Grannis, Shaun J.; Naleway, Allison L.; Ong, Toan C.; Butterfield, Kristen A.; DeSilva, Malini B.; Natarajan, Karthik; Yang, Duck-Hye; Rao, Suchitra; Klein, Nicola P.; Irving, Stephanie A.; Dixon, Brian E.; Dascomb, Kristin; Liao, I.-Chia; Reynolds, Sue; McEvoy, Charlene; Han, Jungmi; Reese, Sarah E.; Lewis, Ned; Fadel, William F.; Grisel, Nancy; Murthy, Kempapura; Ferdinands, Jill; Kharbanda, Anupam B.; Mitchell, Patrick K.; Goddard, Kristin; Embi, Peter J.; Arndorfer, Julie; Raiyani, Chandni; Patel, Palak; Rowley, Elizabeth A.; Fireman, Bruce; Valvi, Nimish R.; Griggs, Eric P.; Levy, Matthew E.; Zerbo, Ousseny; Porter, Rachael M.; Birch, Rebecca J.; Blanton, Lenee; Ball, Sarah W.; Steffens, Andrea; Olson, Natalie; Williams, Jeremiah; Dickerson, Monica; McMorrow, Meredith; Schrag, Stephanie J.; Verani, Jennifer R.; Fry, Alicia M.; Azziz-Baumgartner, Eduardo; Barron, Michelle; Gaglani, Manjusha; Thompson, Mark G.; Stenehjem, Edward; Family Medicine, School of Medicine
    What is already known about this topic? Previous infection with SARS-CoV-2 or COVID-19 vaccination can provide immunity and protection against subsequent SARS-CoV-2 infection and illness. What is added by this report? Among COVID-19–like illness hospitalizations among adults aged ≥18 years whose previous infection or vaccination occurred 90–179 days earlier, the adjusted odds of laboratory-confirmed COVID-19 among unvaccinated adults with previous SARS-CoV-2 infection were 5.49-fold higher than the odds among fully vaccinated recipients of an mRNA COVID-19 vaccine who had no previous documented infection (95% confidence interval = 2.75–10.99). What are the implications for public health practice? All eligible persons should be vaccinated against COVID-19 as soon as possible, including unvaccinated persons previously infected with SARS-CoV-2.
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    Protection of Two and Three mRNA Vaccine Doses Against Severe Outcomes Among Adults Hospitalized With COVID-19-VISION Network, August 2021 to March 2022
    (Oxford, 2023-04-15) DeSilva, Malini B.; Mitchell, Patrick K.; Klein, Nicola P.; Dixon, Brian E.; Tenforde, Mark W.; Thompson, Mark G.; Naleway, Allison L.; Grannis, Shaun G.; Ong, Toan C.; Natarajan, Karthik; Reese, Sarah E.; Zerbo, Ousseny; Kharbanda, Anupam B.; Patel, Palak; Stenehjem, Edward; Raiyani, Chandni; Irving, Stephanie A.; Fadel, William F.; Rao, Suchitra; Han, Jungmi; Reynolds, Sue; Davis, Jonathan M.; Lewis, Ned; McEvoy, Charlene; Dickerson, Monica; Dascomb, Kristin; Valvi, Nimish R.; Barron, Michelle A.; Goddard, Kristin; Vazquez-Benitez, Gabriela; Grisel, Nancy; Mamwala, Mufaddal; Embi, Peter J.; Fireman, Bruce; Essien, Inih J.; Griggs, Eric P.; Arndorfer, Julie; Gaglani, Manjusha; Biostatistics and Health Data Science, School of Medicine
    Background We assessed coronavirus disease 2019 (COVID-19) vaccination impact on illness severity among adults hospitalized with COVID-19, August 2021–March 2022. Methods We evaluated differences in intensive care unit (ICU) admission, in-hospital death, and length of stay among vaccinated (2 or 3 mRNA vaccine doses) versus unvaccinated patients aged ≥18 years hospitalized for ≥24 hours with COVID-19–like illness and positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular testing. We calculated odds ratios (ORs) for ICU admission and death and subdistribution hazard ratios (SHR) for time to hospital discharge adjusted for age, geographic region, calendar time, and local virus circulation. Results We included 27 149 SARS-CoV-2–positive hospitalizations. During both Delta- and Omicron-predominant periods, protection against ICU admission was strongest among 3-dose vaccinees compared with unvaccinated patients (Delta OR, 0.52 [95% CI, .28–.96]; Omicron OR, 0.69 [95% CI, .54–.87]). During both periods, risk of in-hospital death was lower among vaccinated compared with unvaccinated patients but ORs overlapped across vaccination strata. We observed SHR >1 across all vaccination strata in both periods indicating faster discharge for vaccinated patients. Conclusions COVID-19 vaccination was associated with lower rates of ICU admission and in-hospital death in both Delta and Omicron periods compared with being unvaccinated.
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    Waning 2-Dose and 3-Dose Effectiveness of mRNA Vaccines Against COVID-19–Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults During Periods of Delta and Omicron Variant Predominance — VISION Network, 10 States, August 2021–January 2022
    (Center for Disease Control, 2022-02-18) Ferdinands, Jill M.; Rao, Suchitra; Dixon, Brian E.; Mitchell, Patrick K.; DeSilva, Malini B.; Irving, Stephanie A.; Lewis, Ned; Natarajan, Karthik; Stenehjem, Edward; Grannis, Shaun J.; Han, Jungmi; McEvoy, Charlene; Ong, Toan C.; Naleway, Allison L.; Reese, Sarah E.; Embi, Peter J.; Dascomb, Kristin; Klein, Nicola P.; Griggs, Eric P.; Konatham, Deepika; Kharbanda, Anupam B.; Yang, Duck-Hye; Fadel, William F.; Grisel, Nancy; Goddard, Kristin; Patel, Palak; Liao, I-Chia; Birch, Rebecca; Valvi, Nimish R.; Reynolds, Sue; Arndorfer, Julie; Zerbo, Ousseny; Dickerson, Monica; Murthy, Kempapura; Williams, Jeremiah; Bozio, Catherine H.; Blanton, Lenee; Verani, Jennifer R.; Schrag, Stephanie J.; Dalton, Alexandra F.; Wondimu, Mehiret H.; Link-Gelles, Ruth; Azziz-Baumgartner, Eduardo; Barron, Michelle A.; Gaglani, Manjusha; Thompson, Mark G.; Fireman, Bruce; Community and Global Health, Richard M. Fairbanks School of Public Health
    CDC recommends that all persons aged ≥12 years receive a booster dose of COVID-19 mRNA vaccine ≥5 months after completion of a primary mRNA vaccination series and that immunocompromised persons receive a third primary dose.* Waning of vaccine protection after 2 doses of mRNA vaccine has been observed during the period of the SARS-CoV-2 B.1.617.2 (Delta) variant predominance† (1-5), but little is known about durability of protection after 3 doses during periods of Delta or SARS-CoV-2 B.1.1.529 (Omicron) variant predominance. A test-negative case-control study design using data from eight VISION Network sites§ examined vaccine effectiveness (VE) against COVID-19 emergency department/urgent care (ED/UC) visits and hospitalizations among U.S. adults aged ≥18 years at various time points after receipt of a second or third vaccine dose during two periods: Delta variant predominance and Omicron variant predominance (i.e., periods when each variant accounted for ≥50% of sequenced isolates). Persons categorized as having received 3 doses included those who received a third dose in a primary series or a booster dose after a 2 dose primary series (including the reduced-dosage Moderna booster). The VISION Network analyzed 241,204 ED/UC encounters** and 93,408 hospitalizations across 10 states during August 26, 2021-January 22, 2022. VE after receipt of both 2 and 3 doses was lower during the Omicron-predominant than during the Delta-predominant period at all time points evaluated. During both periods, VE after receipt of a third dose was higher than that after a second dose; however, VE waned with increasing time since vaccination. During the Omicron period, VE against ED/UC visits was 87% during the first 2 months after a third dose and decreased to 66% among those vaccinated 4-5 months earlier; VE against hospitalizations was 91% during the first 2 months following a third dose and decreased to 78% ≥4 months after a third dose. For both Delta- and Omicron-predominant periods, VE was generally higher for protection against hospitalizations than against ED/UC visits. All eligible persons should remain up to date with recommended COVID-19 vaccinations to best protect against COVID-19-associated hospitalizations and ED/UC visits.