Reason why COVID vaccine caused serious blood clots revealed
The cause of rare blood clots in a COVID-19 vaccine that killed eight people in Australia may have been found in a new study by local researchers.
The AstraZeneca vaccine was one of the two primarily used in Australia during the early stages of the pandemic, but caused blood clots in about two to three people out of every 100,000 who received it.
The condition was called vaccine-induced immune thrombocytopenia and thrombosis, 173 confirmed or probable cases of which caused by the vaccine were recorded.
There were 173 cases of thrombosis occurring in Australia from the AstraZeneca vaccine.(Getty)

Scientists have discovered a way to potentially prevent a rare side effect associated with certain vaccines, thanks to a new understanding of how they function.

“We’ve identified the missing link explaining how a typical immune response can occasionally become detrimental,” explained Dr. Jing Jing Wang of Flinders University.

Dr. Wang noted, “By altering or eliminating this specific adenovirus protein, future vaccines could sidestep this exceedingly rare adverse reaction while still offering robust protection against diseases.”

Symptoms related to thrombosis, such as severe headaches, blurred vision, or shortness of breath, have been observed to emerge between four and 42 days following the initial vaccine dose.

To minimise the risk of the rare side-effect, the Australian government recommended the AstraZeneca vaccine only be given to people over 60 years old.

The increased risk is particularly notable among younger individuals, who may experience a heightened antibody response leading to severe blood clotting.

Despite these risks, many individuals under 60 received at least one dose of the AstraZeneca vaccine due to the limited availability of the Pfizer vaccine, as efforts intensified to meet vaccination targets and ease lockdown measures during the pandemic.

The AstraZeneca vaccine hasn’t been available in Australia since 2023.

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