Vaccine-induced prothrombotic immune thrombocytopenia: pathogenetic and epidemiological issues of concern
Giovanni Di Guardo, DVM, Dipl. ECVP, retired Veterinary Pathologist, discusses the association between adenoviral vector COVID-19 vaccines and rare blood clots, outlining four areas warranting further research.









![A cryomicroneedle patch ready for deployment [Credit: Chang et al. /DOI number: 10.1038/s41551-021-00720-1].](https://www.europeanpharmaceuticalreview.com/wp-content/uploads/cryomicroneedle-patch-300x278.jpg)
![A cryomicroneedle patch ready for deployment [Credit: Chang et al. /DOI number: 10.1038/s41551-021-00720-1].](https://www.europeanpharmaceuticalreview.com/wp-content/uploads/cryomicroneedle-patch-e1620132484839.jpg)










![Two vials labelled 'Janssen COVID-19 Vaccine' [Credit: oasisamuel/Shutterstock.com].](https://www.europeanpharmaceuticalreview.com/wp-content/uploads/Janssen-COVID-19-Vaccine-300x278.jpg)
![Two vials labelled 'Janssen COVID-19 Vaccine' [Credit: oasisamuel/Shutterstock.com].](https://www.europeanpharmaceuticalreview.com/wp-content/uploads/Janssen-COVID-19-Vaccine-e1619436264802.jpg)










