Toronto's Hospital for Sick Children says it now has two patients with unrelated cases of COVID-19 — and one of them is linked to an outbreak that infected their parents and a member of the clinical team.

SickKids says the outbreak involves a teenage patient who was in an inpatient unit specializing in hematology/oncology.

They say all patients on the affected unit have tested negative for COVID-19 and that everyone who has been exposed or suspected to have been exposed has been notified.

The other case involves a patient who tested positive Tuesday morning, after arriving Monday.

Both patients were being cared for in a unit with dedicated procedures and processes developed for COVID-19 cases.

SickKids says it is investigating how the virus was transmitted, along with Toronto Public Health.