Table 1 Study participants characteristicsa.

From: Detection of SARS-CoV-2 IgA and IgG in human milk and breastfeeding infant stool 6 months after maternal COVID-19 vaccination

Maternal characteristics (n = 34)

N (%) or mean ± standard deviationa

Age (years)

33.5 ± 3.9

Race

 White

33 (97)

 Asian

1 (3)

Ethnicity

 Non-Hispanic

24 (69)

 Hispanic

7 (19)

 Not disclosed

3 (11)

Body mass index (kg/m2)b,c

24.3 ± 3.9

 Normal/healthy weight

21 (61)

 Overweight

8 (25)

 Obese

4 (11)

History of allergiesc

9 (25)

History of asthmac

4 (11)

History of inadequate immune response to vaccinec

2 (5)

History of known COVID-19 infectiond

1 (3)

Family history of cancerc

19 (53)

Family history of autoimmune disorderc

3 (8)

Antibiotic use in 6 months before enrollmentc

10 (29)

Time postpartum (months)

5.2 ± 6.2

Decreased human milk supply after COVID vaccinec

 No

27 (84)

 Yes

2 (6)

 Transient

3 (9)

Vaccine brandc

 Moderna

13 (36)

 Pfizer

20 (56)

Infant characteristics (n =  24)

N (%) or mean ± standard deviationa

Infant gender

 Female

10 (42)

 Male

14 (58)

Infant age at the time of stool collection (months)

10 ± 6

Number of stools in each infant age groupe

 <6 months

5 (23)

 6–12 months

12 (46)

 13–24 months

6 (23)

 >24 months

2 (8)

  1. aCategorical data are given as the number of participants and, in parentheses, the percentage of the total. Continuous data are provided as means ± standard deviations.
  2. bDefinitions put forth by the U.S. Centers for Disease Control and Prevention were used for body mass index categories [16].
  3. cMissing data from 1 subject.
  4. dPre-vaccination sample data unavailable from a subject with known prior COVID-19 infection.
  5. en = 24 due to one infant being in different age groups on dates of different sample collections.
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