A man has died in Pittsburgh, Pennsylvania after receiving a second dose of the Moderna COVID-19 vaccine, and was determined to have possibly had a rare and severe blood clot condition called thrombosis with thrombocytopenia when he presented to the hospital, according to a report. The case report of the 65-year-old man is detailed in a letter to the academic journal Annals of Internal Medicine published on Monday. The journal announced on Twitter that the research led by Dr. Swathi Sangli “is believed to be the first case of #thrombosis with thrombocytopenia after a messenger RNA #COVID19 vaccine.” Authors of the study said their report “complicates hypotheses that implicate adenoviral vectors as the sole cause of VITT or TTS.” The COVID-19 vaccines that are based on deactivated adenovirus include the AstraZeneca and the Johnson & Johnson (J&J) vaccines, which have previously seen reported cases of thrombosis with thrombocytopenia. In the latest case study, the man, …