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Table 1 COVID-19 vaccine breakthrough cases reported to CDC from five U.S. states during January–March 2021

From: Evaluating risk factors associated with COVID-19 infections among vaccinated people early in the U.S. vaccination campaign: an observational study of five states, January–March 2021

Characteristic

Vaccine breakthrough cases

[N = 1582]

No

(%)

Gender

  

 Female

1053

(67)

 Male

524

(33)

 Unknown

5

(< 1)

Age group in years

  

 16–49

632

(40)

 50–64

333

(21)

 65–74

226

(14)

 75–84

235

(15)

 ≥ 85

156

(10)

Race/ethnicity

  

 Non-Hispanic

  

  White

1024

(65)

  Black

60

(4)

  American Indian/Alaska Native

52

(3)

  Asian

24

(2)

  Multiracial/other

50

(3)

 Hispanic, any race

75

(5)

 Unknown

297

(19)

Residence type

  

 Long-term care facility

227

(14)

 Other

956

(60)

 Unknown

399

(25)

Positive SARS-CoV-2 test type

  

 Nucleic acid amplification test

1312

(83)

 Antigen

254

(16)

 Unknown

16

(1)

Vaccine received

  

 Pfizer-BioNTech

1073

(68)

 Moderna

502

(32)

 Unknown

7

(< 1)

Symptoms associated with positive test

  

 Asymptomatic

531

(34)

 Symptomatic

661

(41)

 Unknown

390

(25)

Hospitalized

  

 Yes

181

(11)

Outcome

  

 Died

42

(3)

  1. Five states are Alaska, Colorado, Indiana, Kentucky, and Tennessee
  2. Hospitalization status was reported as unknown for 387 vaccine breakthrough cases but they were not identified in the hospitalization databases
  3. Outcome was reported as unknown for 450 vaccine breakthrough cases but they were not identified in the death databases