1918 Flu Death certificate #usa

Gayle Schlissel Riley

On the death certificates for the 1918 flu, what did they label as the cause? My grandmother had a brother who died at that time. I never saw the death certificate, only burial records.
What would they say was the cause, for these deaths?
Abraham Schlissel, Detroit Mich.  EDER and SCHLISSEL was my family in Detroit. Thanks Gayle

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