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. 2021 Oct 1;70(39):1379–1384. doi: 10.15585/mmwr.mm7039e4

TABLE 2. Adverse reactions reported by persons who received an additional dose of COVID-19 vaccine (N = 22,191)* and completed at least one v-safe health check-in survey on days 0–7 after vaccination, by primary vaccination series and manufacturer of subsequent dose received — United States, August 12–September 19, 2021.

Reaction Moderna, % (n = 10,477)
Pfizer-BioNTech, % (n = 11,284)
Janssen, %†,§ (n = 174)
Total 
(N = 22,191)
Dose 3 Moderna 
(n = 10,453; 98.6%) Dose 3 Pfizer-BioNTech
(n = 144; 1.4%) Dose 3 Janssen
(n = 4; 0.04%) Dose 3 Pfizer-BioNTech
(n = 11,209; 98.2%) Dose 3 Moderna
(n = 197; 1.7%) Dose 3 Janssen
(n = 6; 0.1%) Dose 2 Janssen
(n = 48; 27.0%) Dose 2 Moderna
(n = 64; 36.0%) Dose 2 Pfizer-BioNTech
(n = 66; 37.1%)
Days since primary series, median (IQR)
182 (164–198)
183 (161–204)
173 (141–182)
183 (157–209)
186 (161–217)
123 (113–182)
84 (16–136)
156 (140–164)
150 (136–167)
182 (160–202)
Any injection site reaction
80.9
64.6
75.0
69.4
81.7
83.3
25.0
70.3
80.3
74.9
Itching
20.0
11.8
0
8.4
10.2
16.7
10.4
6.3
7.6
13.9
Pain
75.9
60.4
75.0
66.6
80.2
83.3
20.8
68.8
74.2
71.0
Redness
25.2
8.3
0
9.8
20.8
16.7
6.3
7.8
12.1
17.1
Swelling
33.6
17.4
0
16.8
30.5
16.7
6.3
12.5
18.2
24.8
Any systemic reaction
75.2
59.7
50.0
65.1
76.1
100
31.3
68.8
63.6
69.9
Abdominal pain
8.4
3.5
0
6.4
8.1
16.7
4.2
3.1
6.1
7.3
Myalgia
49.8
29.2
0
36.3
49.2
50.0
20.8
45.3
33.3
42.7
Chills
31.3
8.3
50.0
17.5
33.5
50.0
8.3
23.4
10.6
24.1
Diarrhea
9.9
7.6
0
9.0
9.6
16.7
8.3
6.3
9.1
9.4
Fatigue
61.8
44.4
0
51.0
60.9
83.3
14.6
48.4
50.0
56.0
Fever
36.4
20.1
50.0
22.2
37.1
50.0
6.3
37.5
12.1
29.0
Headache
49.0
31.1
0
38.4
49.7
83.3
18.8
35.9
40.9
43.4
Joint pain
33.0
18.8
0
23.0
31.0
33.3
16.7
20.3
19.7
27.7
Nausea
18.8
10.4
25.0
13.6
21.3
33.3
8.3
9.4
18.2
16.1
Rash
2.3
0.7
0
1.9
2.5
0
4.2
1.6
1.5
2.1
Vomiting
2.2
2.1
25.0
1.4
2.0
0
2.1
0
0
1.7
Any health impact
39.2
19.4
0
25.2
39.1
33.3
16.7
28.1
24.2
31.8
Unable to perform normal daily activities
35.2
18.1
0
22.1
33.0
33.3
10.4
25.0
15.2
28.3
Unable to work or attend school
13.7
4.9
0
9.0
21.3
16.7
10.4
6.3
13.6
11.3
Needed medical care
2.1
1.4
0
1.5
3.0
0
6.3
0
0
1.8
Telehealth
0.9
0.7
0
0.7
1.0
0
2.1
0
0
0.8
Clinic
0.7
0.7
0
0.6
0.5
0
4.2
0
0
0.6
Emergency visit
0.2
0
0
0.2
0
0
4.2
0
0
0.2
Hospitalization 0.05 0 0 0.1 0 0 0 0 0 0.1

Abbreviation: IQR = interquartile range.

* Percentage of registrants who completed at least one v-safe health check-in survey on days 0–7 after vaccination.

Primary vaccination series.

§ Includes persons who received a primary Janssen single-dose and one additional dose of vaccine from the listed manufacturers.