I already received the Janssen vaccine. Should I be worried?
For three weeks after receiving the vaccine, watch for possible symptoms of a blood clot with low platelets including:
- Severe or persistent headaches or blurred vision
- Shortness of breath
- Chest pain
- Leg swelling
- Persistent abdominal pain
- Easy bruising or tiny blood spots under the skin beyond the injection site
Seek medical care immediately if you develop one or more of these symptoms.
What was the purpose of the pause?
The pause allowed CDC to communicate with healthcare providers and re-emphasize the importance of reporting severe events in people who have received this vaccine, as well as how to report such events. The pause also gave experts time to carefully review all available data and conduct a risk-benefit analysis around the use of this vaccine.
Is this a concern for the other COVID-19 vaccines?
No. As of April 23, 2021, thrombosis with thrombocytopenia syndrome (TTS)—blood clots with low platelets—has not been linked to the Pfizer-BioNTech or Moderna COVID-19 vaccines after more than 210 million doses administered.