Is not toxic shock caused by a bacterial infection? Covid is viral (non-living). Isn’t this apples and oranges?
Another possibility... Kawasaki disease
https://www.healio.com/pediatrics/emerging-diseases/news/online/%7B4a390309-ea18-441c-bcf0-6cbf55d30ea4%7D/does-sars-cov-2-cause-kawasaki-disease-in-children?utm_source=selligent&utm_medium=email&utm_campaign=pediatrics%20news&m_bt=4834664594449