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Pfizer vaccine: The one side effect more common after booster and it may last for 8 days

TO COUNTER waning immunity ahead of winter, millions of Brits are being offered a booster Covid vaccine to top up their protection against coronavirus. According to safety and immune response data analysed by the FDA, the Pfizer booster vaccine engenders a side effect that’s more commonly seen in the booster shot and it can last up to eight days.

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Health officials are urging those eligible for a booster shot to come forward in light of a sluggish uptake. Millions of high-risk Brits are being offered a booster dose of either the Pfizer/BioNTech vaccine or Moderna vaccine to top up immunity levels conferred from previous doses, which have been shown to wane over a six-month period. Regulatory bodies approved the decision to roll out a booster dose after analysing trial data.

As part of this data analysis, the side effects of the booster shots have come to light

The Food and Drug Administration (FDA), the regulatory body in the US, analysed safety and immune response data from a subset of participants from the original clinical trial of the Pfizer vaccine.

Safety was evaluated in 306 participants 18 through 55 years of age and 12 participants 65 years of age and older who were followed for an average of over two months.

Curiously, one side effect was seen to be more common following the booster shot than previous doses.


Swollen lymph nodes in the underarm more common after booster

Pfizer booster dose: Swollen lymph nodes in the underarm more common after booster (Image: Getty Images)

“Of note, swollen lymph nodes in the underarm were observed more frequently following the booster dose than after the primary two-dose series,” notes the FDA.

The lymph nodes are bean-shaped glands in the neck, armpits, groin, chest, and abdomen.

According to the FDA, the swollen lymph nodes were described as mild to moderate and lasting about two to eight days.

Two cases were reported as ongoing at the time, FDA staff noted.

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