thrombocytopenia

On Sunday, the Pope's thrombocytopenia - a condition that occurs when the platelet count in the blood is too low - was stable, the statement said.

He spent four weeks and five days in a coma and suffered an extremely rare, life-threatening side effect called VITT, or vaccine-induced immune thrombosis and thrombocytopenia.

Platelets are cells that help your blood clot, and it was so unusual to see blood clots combined with low platelet levels, that experts coined a new medical term: vaccine-induced thrombosis with thrombocytopenia, or VITT.

In 2021, the system detected a link between the Johnson & Johnson vaccine and a rare but potentially deadly blood clotting and bleeding syndrome called thrombosis with thrombocytopenia, or TTS.

Reports that the vaccine can trigger a condition known as thrombosis with thrombocytopenia syndrome have bedeviled it from early on.