On the 3rd of November 2020, eight confirmed cases of Legionaires’ disease were admitted to Hospital Pedro Hispano, in Matosinhos. On the same day, the epidemiological investigation started, even though COVID-19 cases were spiking.
The case definition included both the criteria for confirmed case of Legionnaires’ disease and also the following epidemiological criteria: symptom onset after October 15th, and living, working or travelling frequently between Matosinhos and Vila do Conde since September 24th.

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