A German scientist studying slotxo โหลด extremely rare blood clots linked to AstraZeneca's COVID-19 vaccine said on Tuesday (Apr 20) Johnson & Johnson has agreed to work with him on the research after similar serious side effects emerged in recipients of its shot.

Andreas Greinacher, a transfusion medicine expert at Greifswald University, announced the collaboration after the European Medicines Agency said it would add a label to J&J's vaccine warning of unusual blood clots with low platelet counts. AstraZeneca's shot has a similar warning.

As with AstraZeneca, the EMA said benefits of getting J&J's shot still outweigh the clotting risk, a position Greinacher backs, too.

Greinacher, who on Tuesday released a new paper offering a potential explanation for the complications, wants J&J vaccine samples to study in his lab. Since mid-March his team has been analysing specimens from people who suffered clots after getting AstraZeneca's shot.

"We agreed today with (J&J) that we will work together," Greinacher said during a news conference. "My biggest need, which I've expressed to the company, is I would like to get access to the vaccine, because the J&J vaccine is not available in Germany."

Johnson & Johnson did not immediately respond to a request for comment.

The EMA said on Tuesday it suspects the vaccine may trigger an unwanted immune response, but safety committee chairwoman Sabine Straus said it has not identified specific risk factors.