Experts at the European Medicines Agency are preparing to present the conclusions of their investigation into possible links between the Johnson & Johnson coronavirus vaccine and very rare cases of unusual clotting disorders detected in the US.
Last week, J&J halted its European rollout of its one-dose vaccine after the U.S. Food and Drug Administration recommended officials pause its use while the rare blood clot cases are examined. Officials identified six cases of the highly unusual blood clots among nearly 7 million people who were immunized with the shot in the US.
Johnson & Johnson advised European governments to store their doses until the EU drug regulator issued guidance on their use; widespread use of the shot in Europe has not yet started.
The delay was a further blow to vaccination efforts in the European Union, which have been plagued by supply shortages, logistical problems and concerns over unusual blood clots also in a small number of people who received the AstraZeneca COVID-19 vaccine. Experts worry the temporary halt on J&J’s shot could further shake vaccine confidence and complicate worldwide COVID-19 immunization efforts.
Last week, South Africa suspended its use of the vaccine in the wake of the U.S. pause, and countries including Italy, Romania, the Netherlands, Denmark and Croatia put their J&J doses into storage.
The blood clots linked to the J&J vaccine are occurring in unusual parts of the body, such as veins that drain blood from the brain. Those patients also have abnormally low levels of blood platelets, a condition normally linked to bleeding, not clotting.
With the AstraZeneca vaccine, scientists in Norway and Germany have suggested that some people are experiencing an abnormal immune system response, forming antibodies that attack their own platelets.
On Monday, World Health Organization Director-General Tedros Adhanom Ghebreyesus said more than 5 million new cororavirus cases were confirmed worldwide last week, the highest-ever number in a single week. He noted that cases and hospitalizations among younger people were “increasing at an alarming rate.”
The European Medicines Agency, which regulates drugs used in European Union member nations, said last month there was a “possible link” between the AstraZeneca vaccine and rare blood clots but said the homeless.