Scientists have been able to retrieve genetic material from the remains of those who are confirmed to have died during that pandemic. They've effectively sequen

Scientists have been able to retrieve genetic material from the remains of those who are confirmed to have died during that pandemic. They've effectively sequenced the genome even to know how it relates to other flu viruses https://www.news.vcu.edu/article/Genetic_sequencing_of_deadly_1918_influenza_virus_shows_link https://www.news.vcu.edu/article/Genetic_sequencing_of_deadl... You might be thinking of the 1889-90 "flu" pandemic which has been theorized to be from a coronavirus known now as OC43, but it's not certain.