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. 2021 Jan 2;397(10268):27–38. doi: 10.1016/S0140-6736(20)32540-X

Table 3.

Occurrence of solicited adverse events within 7 days, and serious adverse events, important medical events, and unsolicited adverse events within 30 days of first or second vaccinations in infants

Monovalent OPV2
Novel OPV2-c1
Novel OPV2-c2


Standard dose
Low dose
High dose
Low dose
High dose
Dose 1 (n=110) Dose 2 (n=48) Dose 1 (n=138) Dose 2 (n=51) Dose 1 (n=150) Dose 2 (n=49) Dose 1 (n=135) Dose 2 (n=49) Dose 1 (n=151) Dose 2 (n=50)
Serious adverse events 1 (1%) 0 1 (1%) 1 (2%) 6 (4%) 1 (2%) 2 (1%) 1 (2%) 9 (6%) 1 (2%)
Vaccine-related serious adverse events 0 0 0 0 0 0 0 0 0 0
Important medical events 0 1 (2%) 0 0 0 0 0 0 0 0
Vaccine-related important medical events 0 0 0 0 0 0 0 0 0 0
Solicited adverse events
Any 29 (26%) 7 (15%) 37 (27%) 13 (25%) 49 (33%) 14 (29%) 42 (31%) 13 (27%) 52 (34%) 12 (24%)
Grade 1 21 (19%) 6 (13%) 24 (17%) 6 (12%) 20 (13%) 6 (12%) 29 (21%) 10 (20%) 36 (24%) 10 (20%)
Grade 2 6 (5%) 1 (2%) 12 (9%) 7 (14%) 28 (19%) 8 (16%) 12 (9%) 3 (6%) 15 (10%) 2 (4%)
Grade 3 2 (2%) 0 1 (1%) 0 1 (1%) 0 1 (1%) 0 1 (1%) 0
Causally associated (adverse reactions) 14 (13%) 5 (10%) 35 (25%) 12 (24%) 46 (31%) 11 (22%) 37 (27%) 11 (22%) 45 (30%) 12 (24%)
Unsolicited adverse events
Any 74 (67%) 33 (69%) 70 (51%) 30 (59%) 94 (63%) 33 (67%) 89 (66%) 29 (59%) 96 (64%) 30 (60%)
Causally associated 1 (1%) 0 0 0 2 (1%) 0 0 0 0 1 (2%)

No serious adverse events or important medical events were considered to be serious adverse reactions or important medical reactions (ie, causally associated with vaccination). OPV2=type 2 oral poliovirus vaccine.