A 15-year-old boy may have already had the infection that killed him when he visited his GP two days before he suddenly died.
Seán Hughes died just hours after he collapsed at home from a cardiac arrest while watching TV with his mum, who didn't realise he had stopped breathing.
The teenager from Coláiste Eoin in Finglas passed away on January 12 2018 after suffering from sepsis, and an inquest has been held into his death.