Evaluation of Safety and Reactogenicity
A reactogenicity subgroup of participants recorded
solicited injection-site reactions (pain, redness,
and swelling) and systemic reactions (fatigue,
fever, gastrointestinal symptoms, headache, myalgia,
and shivering) on diary cards for 7 days after
each vaccination. This subgroup included all participants
who were 70 years of age or older and
randomly selected participants in the two other
age groups (50 to 59 years and 60 to 69 years).
The participants rated the intensity of the solicited
reactions on a scale from 0 (absent) to 3
(preventing normal everyday activities). Unsolicited
adverse events were recorded for 30 days after
each dose. Serious adverse events were recorded
in all participants for up to 12 months
after the second dose. Such events that were considered
to be related to the study vaccine or study
participation, any events resulting in death, and
potentially immune-mediated diseases were evaluated
in all participants over the entire study period.
(A full list of potentially immune-mediated
diseases is provided in the Supplementary Appendix.)