Johnson&Johnson şi AstraZeneca au fost anterior asociate cu o combinaţie foarte rară de cheaguri sangvine şi număr scăzut de plachete sangvine, cunoscută sub numele de tromboză cu sindrom de trombocitopenie (TTS).
EMA a precizat că noua afecţiune de coagulare, potenţial letală, trebuie să fie trecută în prospectul vaccinului anti-COVID-19 Johnson&Johnson separat de TTS.
Ce este tromboembolismul venos
Tromboembolism venos (VTE) începe de obicei printr-un cheag format într-o venă de la nivelul picioarelor, mâinilor şi zonei inghinale, care călătoreşte apoi la plămâni şi blochează fluxul sangvin pulmonar.
Indiferent de utilizarea vaccinurilor, VTE este cel mai frecvent cauzată de producerea unor vătămări sau de lipsa de mişcare a pacienţilor imobilizaţi la pat. Pastilele contraceptive şi mai multe boli cronice sunt de asemenea considerate factori de risc.
De asemenea, EMA a recomandat ca trombocitopenia imună (ITP), o anomalie hemoragică provocată de organismul uman care atacă din greşeală plachetele sangvine, să fie adăugată pe lista efectelor adverse cu frecvenţă necunoscută înscrise în prospectul vaccinurilor de la Johnson&Johnson şi AstraZeneca.
Atât AstraZeneca, cât și Johnson & Johnson au la bază virusuri-vector inofensivi, care instruiesc celulele umane să sintetizeze o proteină ce pregăteşte sistemul imunitar împotriva viitoarelor infecţii provocate de COVID.
La sfârșitul lunii iulie, EMA a anunțat că va trece în prospectul vaccinului anti-COVID produs de Johnson & Johnson faptul că serul poate duce la apariția sindromului Guillain-Barré, o afecţiune neurologică rară.
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