INCUBATION.
Great discrepancies occur in the statements of different observers, but inasmuch as each epidemic varies in severity, a severe type of the “Flu” may have a shorter incubative period than a mild type, and therefore taking the variations in type into consideration, may reconcile the differences. If Influenza was accompanied with a facial eruption or exanthem, this would materially assist in the determination of its Incubative period. In Hawaii, two to three days is the most frequent period of Incubation; it may vary, however, from 24 hours to 72 hours, even to five days; in these long incubative cases, headache, aching eyeballs, and great languor are the indicating signs, and those persons so affected succumb slowly and offer great resistance to the overpowering toxins of the Bacillus Influenzae.
The Immunity which a person may possess in one Epidemic and not in another, may be accounted for by assuming that each Epidemic may have a difference in the strain or the species of the Influenza bacillus.