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From the 5/7/2021 release of VAERS data (an older release, current is 11/26/2021):

This is VAERS ID 1004202

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Case Details

VAERS ID: 1004202 (history)  
Form: Version 2.0  
Sex: Female  
Location: Pennsylvania  
   Days after vaccination:0
Submitted: 0000-00-00
Entered: 2021-02-05
Vaccin­ation / Manu­facturer Lot / Dose Site / Route

Administered by: Unknown       Purchased by: ?
Symptoms: Abortion spontaneous, Exposure during pregnancy, Human chorionic gonadotropin abnormal, Ultrasound scan, Vaginal haemorrhage
SMQs:, Haemorrhage terms (excl laboratory terms) (narrow), Pregnancy, labour and delivery complications and risk factors (excl abortions and stillbirth) (narrow), Termination of pregnancy and risk of abortion (narrow), Fertility disorders (narrow)

Life Threatening? No
Birth Defect? No
Died? No
Permanent Disability? No
Recovered? Yes
Office Visit? No
ER Visit? No
ER or Doctor Visit? No
Hospitalized? No
Previous Vaccinations:
Current Illness:
Preexisting Conditions: Medical History/Concurrent Conditions: Miscarriage; Term birth
Diagnostic Lab Data: Test Name: hCG; Result Unstructured Data: 0; Test Date: 20210119; Test Name: hCG; Test Result: Inconclusive ; Result Unstructured Data: Started to climb back up again; Test Date: 20201227; Test Name: USG; Result Unstructured Data: Got it done, but it was too early so it didn''t show anything.

Write-up: Presumed miscarriage; human chorionic gonadotropin decreased; Vaccine exposure during pregnancy; A spontaneous report was received from a consumer who was also a 31-years-old, female patient who received Moderna''s COVID-19 vaccine (mRNA-1273) who experienced vaccine exposure during pregnancy, human chorionic gonadotropin decreased and presumed miscarriage. The patient''s medical history was not provided. The patient''s prior history of pregnancies were two miscarriages (2013 and 2015) and two full term births (2017 and 2019) were reported. The patient''s last menstrual period was 25 Nov 2021. The estimated due date was 1 Sep 2021. Concomitant medications included sertraline hydrochloride and vitamins. On 27 Dec 2020, the patient found out she was pregnant, but she already had some bleeding. On 28 Dec 2020, the patient received their first of two planned doses of mRNA-1273 (Lot number: 026L20A) intramuscularly in the right arm for prophylaxis of COVID-19 infection. On undisclosed date, after receiving the vaccine her human chorionic gonadotropin (hCG) levels went down to 0. Her health care professional presumed it was a miscarriage. Treatment for the event was not reported. On 19th Jan 2021, her hCG levels started to climb back up again. Action taken with the second dose of mRNA-1273 in response to the event was not reported. The outcome of the event, presumed miscarriage, and human chorionic gonadotropin decreased was unknown. The outcome of the event, vaccine exposure during pregnancy, was resolved on 28 Dec 2020.; Reporter''s Comments: This spontaneous report concerns a 31-years-old, G5P2 female patient who experienced vaccine exposure during pregnancy and presumed miscarriage. The patient''s last menstrual period was 25-Nov-2020 with estimated date of delivery as 01-Sep-2021. One day after the patient discovered she was pregnant; she received the first dose of mRNA-1273 vaccine (lot # 026L20A expiration date unknown). The event of presumed miscarriage (human chorionic gonadotropin (hCG) levels went down to 0) was diagnosed on an unknown date after vaccine administration. The HCG level began to climb up again 22 days after the vaccine administration. Based on the information provided which includes, the patient''s obstetric history, vaginal bleeding the day prior to mRNA-1273 vaccination and without definitive confirmation of pregnancy loss, there is not enough evidence to assess that that there was a miscarriage and is also unlikely to be associated with mRNA-1273 administration. The event of vaccine exposure during pregnancy is considered not applicable

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