The study concludes that after age, heart and kidney problems, immune deficiencies (such as AIDS), neurological disease and chronic haematological disease are the factors that have the highest risk of death for patients with covid-19.

The work was prepared by a group of Portuguese researchers from seven institutes.

The authors of the study emphasised that the results obtained “must be interpreted with caution” as they have limitations such as the fact that they refer to the first infection period in Portugal, between January and April 2020, “which may change if new data is meanwhile provided by DGS” and there is no data on the symptoms and results of laboratory tests.