Correspondence to 'Paediatric multisystem inflammatory syndrome temporally associated with SARS-CoV-2 mimicking Kawasaki disease (Kawa-COVID-19): a multicentre cohort'.

We read with interest the clinical study entitled ‘Paediatric multisystem inflammatory syndrome temporally associated with SARS-CoV-2 mimicking Kawasaki disease (Kawa-COVID-19): a multicentre cohort’ by Pouletty et al.1 In this series, the authors suggest that paediatric multisystem inflammatory syndrome temporally associated with SARS-CoV-2 (PMIS-TS) may represent a new inflammatory syndrome, different from classical Kawasaki disease (KD) as it occurs at an older age, and with a higher frequency of severe myocarditis.1 Likewise to this study, our Pediatric Tuscany Network (PTN)—16 paediatric units serving a region of 593 606 people aged less than 18 years—worked out the COVASAKI survey to detect the incidence of PMIS-TS cases and the eventual rise of KD in Tuscany during COVID-19 pandemic. Between 1 February 2000 and 30 June 2020, we tracked children with PMIS-TS and KD, aiming to compare the number of KD cases in the same 5 months of the previous 5 years and overall with the total number in the last 5 years. No PMIS-TS cases were reported in our region. Ten KD children were diagnosed in 5 units (incidence two per month). Demographics, clinical and imaging findings, treatment and outcome of patients are reported in table 1. No specific intensive support was required. No coronary involvement was reported. Nasopharyngeal swabs (performed in 7/10) and serological test (available in 6/10) for SARS CoV-2 resulted negative.