Pfizer BioNTech Covid Vaccine and Klebsiella infection - a phase IV clinical study of CDC and FDA data


Klebsiella infection is found among people who get Pfizer BioNTech Covid Vaccine, especially for people who are male, 60+ old, and after 30 days of getting the vaccine.

The phase IV clinical study analyzes which people get Pfizer BioNTech Covid Vaccine and have Klebsiella infection. It is created by eHealthMe based on reports of 401,887 people who have side effects when getting Pfizer BioNTech Covid Vaccine from the CDC and the FDA, and is updated regularly. You can use the study as a second opinion to make health care decisions.

Phase IV trials are used to detect adverse drug outcomes and monitor drug effectiveness in the real world. With medical big data and AI algorithms, eHealthMe is running millions of phase IV trials and makes the results available to the public. Our original studies have been referenced on 600+ medical publications including The Lancet, Mayo Clinic Proceedings, and Nature.

On Apr, 04, 2023

401,887 people reported to have side effects after getting Pfizer BioNTech Covid Vaccine.
Among them, 13 people (0.0%) have Klebsiella infection.

What is Klebsiella infection?

Klebsiella infection is found to be associated with 1,261 drugs and 713 conditions by eHealthMe.

Number of reports submitted per year:

Pfizer biontech covid vaccine and Klebsiella infection?

Time to have Klebsiella infection from when people get Pfizer BioNTech Covid Vaccine *:

  • on the same day: 7.69 %
  • in the first week: 23.08 %
  • in the first 30 days: 0.0 %
  • after 30 days: 69.23 %

Gender of people *:

  • female: 46.15 %
  • male: 53.85 %

Age of people *:

  • 0-1: 0.0 %
  • 2-9: 0.0 %
  • 10-19: 8.33 %
  • 20-29: 0.0 %
  • 30-39: 0.0 %
  • 40-49: 8.33 %
  • 50-59: 8.33 %
  • 60+: 75.0 %

Did people recover *:

  • yes: 57.14 %
  • no: 42.86 %

Death as an outcome *:

  • yes: 23.08 %
  • no: 76.92 %

# of vaccine dose *:

  • 1: 41.67 %
  • 2: 41.67 %
  • 3+: 16.67 %

Common side effects people have besides Klebsiella infection *:

  1. Atrial Fibrillation/flutter (atrial fibrillation and flutter are abnormal heart rhythms in which the atria, or upper chambers of the heart, are out of sync with the ventricles): 5 people, 38.46%
  2. Urinary Tract Infection: 4 people, 30.77%
  3. Fever: 4 people, 30.77%
  4. Sepsis (a severe blood infection that can lead to organ failure and death): 3 people, 23.08%
  5. Chest Pain: 3 people, 23.08%
  6. Chills (felling of cold): 3 people, 23.08%
  7. Headache (pain in head): 3 people, 23.08%
  8. Death: 3 people, 23.08%
  9. Respiratory Acidosis (respiratory failure or ventilatory failure, causes the ph of blood and other bodily fluids to decrease): 3 people, 23.08%
  10. Septic Shock (shock due to blood infection): 3 people, 23.08%

* Approximation only. Some reports may have incomplete information.

Related studies

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Vaccine side effects by duration, gender, age and dose:

Common Pfizer biontech covid vaccine side effects:

Browse all side effects of Pfizer BioNTech Covid Vaccine:

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How the study uses the data?

The study is based on data from the CDC and the FDA.

Who is eHealthMe?

With medical big data and proven AI algorithms, eHealthMe provides a platform for everyone to run phase IV clinical trials. We study millions of patients and 5,000 more each day. Results of our real-world drug study have been referenced on 600+ medical publications, including The Lancet, Mayo Clinic Proceedings, and Nature. Our analysis results are available to researchers, health care professionals, patients (testimonials), and software developers (open API).


WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only. Our phase IV clinical studies alone cannot establish cause-effect relationship. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.

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