Student or educator? Sign up with your school email and get 6 months of Pro free.
Cited by 359

The DOI matches its Crossref record; 5 of the 5 references it cites were found in a registry or an index.

COVID-19 Incidence and Death Rates Among Unvaccinated and Fully Vaccinated Adults with and Without Booster Doses During Periods of Delta and Omicron Variant Emergence — 25 U.S. Jurisdictions, April 4–December 25, 2021

Open access
Johnson, Amelia G., Amin, Avnika B., Ali, Akilah R., Hoots, Brooke, Cadwell, Betsy L., Arora, Shivani, Avoundjian, Tigran, Awofeso, Abiola O., Barnes, Jason, Bayoumi, Nagla S., Busen, Katherine, Chang, Carolyn, Cima, Mike, Crockett, Molly, Cronquist, Alicia, Davidson, Sherri, Davis, Elizabeth, Delgadillo, Janelle, Dorabawila, Vajeera, Drenzek, Cherie, Eisenstein, Leah, Fast, Hannah E., Gent, Ashley, Hand, Julie, Hoefer, Dina, Holtzman, Corinne, Jara, Amanda, Jones, Amanda, Kamal-Ahmed, Ishrat, Kangas, Sarah, Kanishka, FNU, Kaur, Ramandeep, Khan, Saadiah, King, Justice, Kirkendall, Samantha, Klioueva, Anna, Kocharian, Anna, Kwon, Frances Y., Logan, Jacqueline, Lyons, B. Casey, Lyons, Shelby, May, Andrea, McCormick, Donald, MSHI, Mendoza, Erica, Milroy, Lauren, O’Donnell, Allison, Pike, Melissa, Pogosjans, Sargis, Saupe, Amy, Sell, Jessica, Smith, Elizabeth, Sosin, Daniel M., Stanislawski, Emma, Steele, Molly K., Stephenson, Meagan, Stout, Allen, Strand, Kyle, Tilakaratne, Buddhi P., Turner, Kathryn, Vest, Hailey, Warner, Sydni, Wiedeman, Caleb, Zaldivar, Allison, Silk, Benjamin J., Scobie, Heather M.·2022·MMWR. Morbidity and Mortality Weekly Report

Abstract

case and death rates and incidence rate ratios (IRRs) were estimated among unvaccinated and fully vaccinated adults by receipt of booster doses during pre-Delta (April-May 2021), Delta emergence (June 2021), Delta predominance (July-November 2021), and Omicron emergence (December 2021) periods in the United States. During 2021, averaged weekly, age-standardized case IRRs among unvaccinated persons compared with fully vaccinated persons decreased from 13.9 pre-Delta to 8.7 as Delta emerged, and to 5.1 during the period of Delta predominance. During October-November, unvaccinated persons had 13.9 and 53.2 times the risks for infection and COVID-19-associated death, respectively, compared with fully vaccinated persons who received booster doses, and 4.0 and 12.7 times the risks compared with fully vaccinated persons without booster doses. When the Omicron variant emerged during December 2021, case IRRs decreased to 4.9 for fully vaccinated persons with booster doses and 2.8 for those without booster doses, relative to October-November 2021. The highest impact of booster doses against infection and death compared with full vaccination without booster doses was recorded among persons aged 50-64 and ≥65 years. Eligible persons should stay up to date with COVID-19 vaccinations.

Overview

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.15585/mmwr.mm7104e2

Cites

5 of 5 references verified0 citation errors · 0 not checkable

Statistics

Verification

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Citations

Cites

Show all 5 references

Cited by

See all 359

Metadata

Authors
Johnson, A. G., Amin, A. B., Ali, A. R., Hoots, B., Cadwell, B. L., Arora, S., Avoundjian, T., Awofeso, A. O., Barnes, J., Bayoumi, N. S., Busen, K., Chang, C., Cima, M., Crockett, M., Cronquist, A., Davidson, S., Davis, E., Delgadillo, J., Dorabawila, V., Drenzek, C., Eisenstein, L., Fast, H. E., Gent, A., Hand, J., Hoefer, D., Holtzman, C., Jara, A., Jones, A., Kamal-Ahmed, I., Kangas, S., Kanishka, F., Kaur, R., Khan, S., King, J., Kirkendall, S., Klioueva, A., Kocharian, A., Kwon, F. Y., Logan, J., Lyons, B. C., Lyons, S., May, A., McCormick, D., MSHI, Mendoza, E., Milroy, L., O’Donnell, A., Pike, M., Pogosjans, S., Saupe, A., Sell, J., Smith, E., Sosin, D. M., Stanislawski, E., Steele, M. K., Stephenson, M., Stout, A., Strand, K., Tilakaratne, B. P., Turner, K., Vest, H., Warner, S., Wiedeman, C., Zaldivar, A., Silk, B. J., & Scobie, H. M.
Venue
MMWR. Morbidity and Mortality Weekly Report
Published
2022-01-28
Volume
71
Issue
4
Pages
132-138
ISSN
  • 0149-2195 (ISSN-L)
  • 1545-861X
OpenAlex
W4207082385
Cited by
359
References
5
FWCI
39.92
Type
journal article
Language
en
Open access
diamond

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review

How to cite

Cite CoChat for the checks on this page, and the paper for its own findings.

This page
CoChat. (2026). Citation check: COVID-19 Incidence and Death Rates Among Unvaccinated and Fully Vaccinated Adults with and Without Booster Doses During Periods of Delta and Omicron Variant Emergence — 25 U.S. Jurisdictions, April 4–December 25, 2021. https://app.cochat.ai/papers/10.15585/mmwr.mm7104e2
The paper
Johnson, A. G., Amin, A. B., Ali, A. R., Hoots, B., Cadwell, B. L., Arora, S., Avoundjian, T., Awofeso, A. O., Barnes, J., Bayoumi, N. S., Busen, K., Chang, C., Cima, M., Crockett, M., Cronquist, A., Davidson, S., Davis, E., Delgadillo, J., Dorabawila, V., . . . Scobie, H. M. (2022). COVID-19 Incidence and Death Rates Among Unvaccinated and Fully Vaccinated Adults with and Without Booster Doses During Periods of Delta and Omicron Variant Emergence — 25 U.S. Jurisdictions, April 4–December 25, 2021. MMWR. Morbidity and Mortality Weekly Report. https://doi.org/10.15585/mmwr.mm7104e2

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.