an active substance has been detected , by the methods described , in five patients in early stages of epidemic influenza during 1918-19 and two patients in early stages of epidemic influenza during 1920 it was not detected in twelve cases of the same disease in which the onset of obvious symptoms occurred more than 36 hours before washing of the nasopharynx was carried out , nor was it found in the secretions of fourteen individuals free from the syndrome of influenza either during the epidemics or the interval between them .
C0012634
disease
C0039082
syndrome