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COVID-19 Vaccine Linked To Elevated Risk Of Facial Palsy: Study

Your Health 247 by Your Health 247
October 18, 2024
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COVID-19 Vaccine Linked To Elevated Risk Of Facial Palsy: Study
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Researchers have found that COVID-19 vaccination is linked to an elevated risk of facial palsy, with the risk particularly high within 28 days of taking the shot.

Facial palsy, also known as Bell’s palsy, leads to temporary weakness or paralysis of the facial muscles, resulting in drooping on one side of the face and difficulty making facial expressions. Although the exact cause of the condition is not known, experts believe that certain viral infections, autoimmune mechanisms, or vaccination can be potential triggers.

Although the pivotal clinical trials during the development of COVID-19 vaccines revealed no severe safety concerns, there has been an imbalance in the incidence of facial palsy among vaccinated individuals compared to the general population. This prompted the researchers to conduct a large-scale study involving over 44 million patients in South Korea to investigate the risk of facial palsy among individuals vaccinated against COVID-19.

The researchers examined a national health information database of individuals who received more than one dose of the COVID-19 vaccine and were then diagnosed with facial palsy within 240 days post-vaccination.

When the incidence of facial palsy within 1–28 post-vaccination was compared to a control window (the remainder of the 240-day observation period), the researchers noted that there were 5,211 cases within the risk window and 10,531 cases within the control window.

The study revealed a 12% increase in the risk of facial palsy within 1 to 28 days after any COVID-19 vaccine dose. The researchers also noted that the risk increased regardless of whether individuals received homologous or heterologous vaccines.

While the second dose showed a 7% higher risk, the combination of the first and second doses indicated an 8% increase. However, no increased risk was associated with the third dose.

“Facial Palsy (FP) risk increased within 28 days postvaccination, primarily after first and second doses, and was observed for both mRNA and viral vaccines. Clinicians should carefully assess the FP risk-benefit profile associated with the COVID-19 vaccines and monitor neurologic signs after vaccination,” the researchers wrote in a news release.

While the exact reason for facial palsy after vaccination is unclear, researchers suggest possible explanations.

One explanation is that mRNA vaccines use lipid nanoparticles to deliver SARS-CoV-2 spike antigen which triggers an immune response that can lead to the release of proinflammatory cytokines. This response may damage the myelin sheath and potentially result in facial palsy.

In the case of viral vector vaccines, they are designed to make antibodies against the virus’s proteins. Since these antibodies are similar to proteins in the nerves, they may mistakenly attack the myelin resulting in nerve damage.

Researchers also noted that COVID-19 infection is associated with a higher risk of facial palsy. Recent studies suggest that this increased risk may be due to nerve compression resulting from inflammation triggered by the virus.



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