Most children who experienced the rare side-effect had symptoms within days of the second shot of Pfizer/BioNTech vaccine, though a similar side-effect is seen with the Moderna jab.
About 86% of the boys affected required some hospital care.
New side effects have been detected in Pfizer and Moderna vaccines. The EU claimed it is going to check if the reactions of patients are related to these drugs' effects.
A small amount of people complained about new kinds of reactions after being vaccinated with these particular vaccines. These reactions include:
- erythema multiforme, a form of allergic skin reaction
- glomerulonephritis, or kidney inflammation,
- nephrotic syndrome, a renal disorder characterised by heavy urinary protein losses.