Identifying and determining the origin of the first human case of COVID-19, which has caused pandemic will be of great benefit in preventing and controlling next epidemics and pandemics. The first confirmed case of COVID-19 was reported in December 2019 in China. This article reports three cases of pneumonia compliant with COVID-19 admitted to Qaemshahr Razi Hospital in Mazandaran province, Iran before the first official report of confirmed case of the disease (November-December 2019). The pattern of radiological involvement was completely consistent with COVID-19 in all three patients. Two patients died of acute progressive respiratory failure despite supportive respiratory therapy and systemic corticosteroids, and the other patient recovered. Study of these cases highlights the fact that emerging and re-emerging diseases should be considered in management of patients with infection and unusual symptoms.

Keywords: epidemic, COVID-19, disease, transmission, infections, case report

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