>> From section Discussion: "Of note, none of the children were vaccinated for SARS-CoV-2. A novel or yet undetected virus also cannot be ruled out at this time.". No obvious common denominator has been discovered in these cases.. However i'm sure the following is being looked into (he stated with a possibly naive hopefullness): >>Modified (recombinant) adenovirus vectors, including replication incompetent types, can deliver DNA coding for specific antigens. Adenovirus have been used to produce viral vector COVID-19 vaccines. Abstract: They may have dealt humanity a 'unfortunate' service', in their quest for dominion..