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Data source: VAERS (Vaccine Adverse Event Reporting System)

Data through 2026 · Updated quarterly

Built by TheDataProject.ai · © 2026 VaccineWatch

Important: VAERS accepts reports of adverse events following vaccination. For any given report, there is no certainty that the reported event was caused by the vaccine. Reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. Most reports to VAERS are voluntary, which means they are subject to biases. This data cannot be used to determine if vaccines cause or contribute to adverse events.

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Important: VAERS reports alone cannot determine if a vaccine caused an adverse event. Reports may contain incomplete, inaccurate, or unverified information. Correlation does not equal causation.

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  3. COVID-19 Vaccine
  4. Activated partial thromboplastin time shortened
COVID-19 Vaccine×Activated partial thromboplastin time shortened

Activated partial thromboplastin time shortened Reports for COVID-19 Vaccine

#1191 most reported symptom for this vaccine

276
Reports
22
Deaths
210
Hospitalizations
7.97
Mortality Rate
%
76.1
Hosp. Rate
%

Activated partial thromboplastin time shortened and COVID-19 Vaccine

Activated partial thromboplastin time shortened has been reported 276 times in association with COVID-19 Vaccine vaccination in VAERS. This represents 0.0% of all 1,121,388 reports for this vaccine.

Among these reports, 22 mentioned death (7.97%) and 210 involved hospitalization (76.1%).

Activated partial thromboplastin time shortened is the #1191 most frequently reported symptom for COVID-19 Vaccine out of 9223 total symptoms.

Disclaimer: VAERS reports describe events that occurred after vaccination but do not establish that the vaccine caused the event. Many reported symptoms may be coincidental or related to underlying conditions.

What This Means

Seeing 276 reports of Activated partial thromboplastin time shortened after COVID-19 Vaccine vaccination may seem alarming, but context is critical. With 1,121,388 total reports for this vaccine (representing many millions of doses), Activated partial thromboplastin time shortened appears in only 0.0% of reports.

The 7.97% mortality rate among these reports is elevated, but this reflects the severity of the condition itself rather than vaccine causation.

Important Context

•Association, not causation: These reports show Activated partial thromboplastin time shortened occurred after vaccination, not that the vaccine caused it.
•Background rates: Activated partial thromboplastin time shortened may occur naturally at baseline rates in the population, unrelated to vaccination.
•Anyone can report: VAERS accepts reports from anyone — patients, parents, healthcare providers — without requiring medical verification.
•Denominator missing: VAERS counts reports, not rates per dose. Without knowing how many doses were given, raw counts can be misleading. Learn more →

Similarly Ranked Symptoms

Bilevel positive airway pressure278 reportsSpecific gravity urine normal277 reportsDrainage276 reportsChapped lips276 reports

Quick Facts

Reports:276
Deaths:22
Hospitalizations:210
% of Vaccine:0.0%
Rank:#1191 of 9223

Related Pages

COVID-19 Vaccine OverviewActivated partial thromboplastin time shortened (All Vaccines)Why Raw Numbers MisleadTop Symptoms Analysis

Data Source

This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.