- 10 Suspected Cases of Blood Clot in Brain Among Those Who Received mRNA Covid-19 Vaccines in S’pore
by Cheryl Tan, https://www.straitstimes.com/
SINGAPORE – There are 10 suspected cases of cerebral venous thrombosis (CVT), or blood clot in the brain, among those who have received the Pfizer and Moderna vaccines for Covid-19 in Singapore.
CVT is a very rare type of blood clot occurring in the veins of the brain, which can happen naturally regardless of vaccination. There are risk factors and these include a medical history of blood clotting disorder, head trauma and the use of medications such as oral contraceptives and drugs for hormonal replacement therapy.
The yearly background incidence rate of CVT in the general population is 1.3 to 2 in 100,000 people, said the Health Sciences Authority (HSA) in its fifth safety update of Covid-19 vaccines.