QSZ-84315-82873 · OpenVSafe

Timeline

Registration Vaccinations Survey responses Call reports Cases without a report Call attempts Call successful Pregnancy survey

2021-03-26
Registered in v-safe
2021-03-26
Dose 1 — Pfizer-BioNTech
2021-03-26
Survey response — day 0, dose 1
MedDRA: Feeling abnormal, Immediate post-injection reaction — Feeling: Fair · Site: Pain · Headache, Fatigue or tiredness · Be unable to work

Free text: Mild brain fog for a few hours after vaccine (upto 7hrs after vaccine)

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-03-26
Report sent to call center — day 0, dose 1
Be unable to work

1 call case(s)
2021-03-27
Survey response — days 1–6 daily, dose 1
MedDRA: Feeling abnormal, Headache — Feeling: Fair · Site: Pain · Headache · Be unable to work

Free text: Brain fog until afternoon. On and off headache

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-03-27
Report sent to call center — days 1–6 daily, dose 1
Be unable to work

1 call case(s)
2021-03-28
Health check-in — days 1–6 daily, dose 1
Feeling: Good · None

Adult check-in
2021-03-29
Survey response — days 1–6 daily, dose 1
MedDRA: Dizziness — Feeling: Fair · Headache

Free text: Dizziness

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-03-30
Health check-in — days 1–6 daily, dose 1
Feeling: Fair · Headache, Fatigue or tiredness

Adult check-in

Vaccinations

Dose	Date	Manufacturer	Co-administered
1	2021-03-26	Pfizer-BioNTech

Call center

2 call center cases

2 priority 2/3 (triaged and no follow up)

See the call center timeline

Free text

Release 6 — day 0, dose 1

2021-03-26

Systemic reaction (other): Mild brain fog for a few hours after vaccine (upto 7hrs after vaccine)

Release 6 — days 1–6 daily, dose 1

2021-03-27

Systemic reaction (other): Brain fog until afternoon. On and off headache

2021-03-29

Systemic reaction (other): Dizziness

Each entry is dated by the survey it was written in (the CDC re-sent the releases with survey dates in 2025); click a date to see that survey response. The CDC cut some text off at about 250 characters: symptoms in every release, and the other two fields in releases 9-12. Those entries are marked "cut off by CDC".

MedDRA terms by release

Field	Preferred term	2021-09	2023-04	2024-11
SRO	Dizziness	✓	✓	✓
SRO	Feeling abnormal	✓	✓	✓
SRO	Headache	✓	✓	✓
SRO	Immediate post-injection reaction	✓	✓	✓

✓ active code · ○ coded but marked inactive · blank = not in that release