Been researching that, especially since I got the JNJ jab yesterday! As you say the JNJ is adenovirus-vectored tech like AZ
An adenovirus helps prime the immune system to fight the coronavirus.
www.nytimes.com
There weren’t any red flags during the trials but guess we’ll see if any change as more data comes in
The Janssen COVID-19 vaccine was publicly approved for international use on Wednesday by UN health agency expert advisory board, SAGE, which allayed concerns over clotting events being associated by some countries, without definitive evidence, with coronavirus jabs.
news.un.org
During trials for the Janssen vaccine involving nearly 44,000 people, 10 of the 22,000 people who received the blank dose developed a blood clot – or thrombo-embolic events - while 14 of the remaining 22,000 who were inoculated, developed a clot. “This is about the same”, for both groups said Dr Annelies Wilder-Smith, SAGE Technical Advisor. “There’s a slight imbalance, but it’s still not statistically significant,”