───────┼────────┼─────────────┼────────┼─────────┼─────────┼──────────── │Summary │Normals │ 493│ 111│ 22.5│ │ │Cases of │ 166│ 109│ 65.7│ │ │influenza │ │ │ │ │ │(for │ │ │ │ │ │comparison) │ │ │ │ ───────┴────────┴─────────────┴────────┴─────────┴─────────┴──────────── The results obtained by throat culture are quite similar to those obtained by the mouse inoculation method. The entire absence of B. influenzæ in the group of 64 throat cultures made in the draft men assembled at Hot Springs as compared with the relatively high incidence in the last two groups examined at Camp Pike is very striking. In consideration of the figures presented in Table IX it is important to remember that the group of 50 men from Hot Springs were all from isolated farm communities, had not previously been assembled and had not been in continuous contact with a widespread epidemic of influenza. On the other hand, the two groups of normal men at Camp Pike were studied immediately after the epidemic had swept through the camp and had been constantly in contact with epidemic influenza for a period of three months, 24 of the 51 actually having had the disease during this period. The fact that in the group of men from Hot Springs, B. influenzæ was found only by the mouse inoculation method is noteworthy, since it indicates that the organism was present in relatively small numbers and could be detected only by a highly selective method. TABLE IX INCIDENCE OF B. INFLUENZÆ IN NORMAL MEN CONTRASTED WITH THAT IN EARLY CASES OF INFLUENZA AS DETERMINED BY MULTIPLE CULTURES FROM NOSE, THROAT, AND SPUTUM