C2J-24588-64700 · OpenVSafe

Timeline

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

2021-05-15
Dose 1 — Pfizer-BioNTech
2021-05-16
Registered in v-safe
2021-05-16
Survey response — days 1–6 daily, dose 1
MedDRA: Breast feeding, Breast pain, Lactation disorder, Lactation insufficiency — Feeling: Poor · Site: Pain · Fever · Chills, Fatigue or tiredness

Free text: Breast soreness, significantly less milk production in the breast closest to injection site (currently nursing 2 week old baby)

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-17
Survey response — days 1–6 daily, dose 1
MedDRA: Breast pain, Lactation insufficiency — Feeling: Fair · Site: Pain · Chills, Fatigue or tiredness

Free text: Breast soreness on injection side, decreased milk production on injection side

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-18
Survey response — days 1–6 daily, dose 1
MedDRA: Lactation insufficiency — Feeling: Fair · Fatigue or tiredness

Free text: Milk supply significantly diminished in my left breast, closest in proximity to injection site

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-19
Survey response — days 1–6 daily, dose 1
MedDRA: Breast pain, Lactation insufficiency — Feeling: Good

Free text: My milk supply has diminished significantly. I went from an extreme over supply to barely having enough to feed my child in days. Breast soreness is gone, but the supply keeps getting worse

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-20
Survey response — days 1–6 daily, dose 1
MedDRA: Breast feeding, Lactation insufficiency, Unevaluable event — Feeling: Good · Get care from a doctor or other healthcare professional · Telehealth, virtual health, or email health consultation

Free text: Systemic reaction (other): Decreased milk supply (lactating mother, almost 3 weeks post partum) · Healthcare visit (other): reaching out to lactation consultant

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-20
Report sent to call center — days 1–6 daily, dose 1
Get care from a doctor or other healthcare professional

1 call case(s)
2021-05-21
Survey response — days 1–6 daily, dose 1
MedDRA: Unevaluable event — Feeling: Good · Get care from a doctor or other healthcare professional · Telehealth, virtual health, or email health consultation

Free text: Decreased milk supply

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-21
Report sent to call center — days 1–6 daily, dose 1
Get care from a doctor or other healthcare professional

1 call case(s)
2021-05-22
Survey response — day 7, dose 1
MedDRA: Breast feeding, Lactation insufficiency, Postpartum state — Feeling: Good · Get care from a doctor or other healthcare professional · Telehealth, virtual health, or email health consultation

Free text: Decreased milk supply in nursing mother 3 weeks post partum

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-22
Report sent to call center — day 7, dose 1
Get care from a doctor or other healthcare professional

1 call case(s)
2021-05-30
Health check-in — day 14, dose 1
Feeling: Good

Adult check-in
2022-04-08
Call 1 — Could Not Reach Participant
2022-04-13
Call 2 — Could Not Reach Participant

Vaccinations

Dose	Date	Manufacturer	Co-administered
1	2021-05-15	Pfizer-BioNTech

Call center

3 call center cases

3 unsuccessful

1 wait over 3 months for a first call

See the call center timeline

Free text

Release 8 — days 1–6 daily, dose 1

2021-05-16

Systemic reaction (other): Breast soreness, significantly less milk production in the breast closest to injection site (currently nursing 2 week old baby)

2021-05-17

Systemic reaction (other): Breast soreness on injection side, decreased milk production on injection side

2021-05-18

Systemic reaction (other): Milk supply significantly diminished in my left breast, closest in proximity to injection site

2021-05-19

Systemic reaction (other): My milk supply has diminished significantly. I went from an extreme over supply to barely having enough to feed my child in days. Breast soreness is gone, but the supply keeps getting worse

2021-05-20

Systemic reaction (other): Decreased milk supply (lactating mother, almost 3 weeks post partum)

Healthcare visit (other): reaching out to lactation consultant

2021-05-21

Systemic reaction (other): Decreased milk supply

Release 8 — day 7, dose 1

2021-05-22

Systemic reaction (other): Decreased milk supply in nursing mother 3 weeks post partum

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
HCVO	Unevaluable event	✓	✓	✓
SRO	Breast feeding	✓	✓	✓
SRO	Breast pain	✓	✓	✓
SRO	Lactation disorder	✓	✓	✓
SRO	Lactation insufficiency	✓	✓	✓
SRO	Postpartum state	·	·	✓
SRO	Unevaluable event	✓	✓	✓

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