In Table LIX the cases of measles are grouped into fifteen day periods according to their dates of onset and the pneumonias arising from each group are tabulated. This tabulation shows very clearly that the pneumonia complications developed in large part in patients with measles entering the hospital during the influenza period, that is, late in September and during the first half of October. TABLE LIX PATIENTS WITH MEASLES AND WITH SUBSEQUENT PNEUMONIA ═════════════════╤═════════════════╤═════════════════╤═════════════════ DATES │ TOTAL CASES OF │ TOTAL CASES │ OF PER CENT │ MEASLES DURING │ PNEUMONIA FROM │ INCIDENCE OF │ INTERVALS OF 15 │ SAME │ PNEUMONIAS │ DAYS │ │ ─────────────────┼────────┬────────┼────────┬────────┼────────┬──────── Sept. 11 to 30 │ 86│ 433│ 14│ 42│ 16.28│ 9.7% Oct. 1 to 15 │ 347│ „ │ 28│ „ │ 8.07│ „ ─────────────────┼────────┼────────┼────────┼────────┼────────┼──────── Oct. 16 to 31 │ 270│ 434│ 8│ 14│ 2.96│ 3.2% Nov. 1 to 15 │ 91│ „ │ 2│ „ │ 2.2│ „ Nov. 16 to 30 │ 56│ „ │ 4│ „ │ 7.15│ „ Dec. 1 to 15 │ 17│ „ │ 0│ „ │ ─────────────────┴────────┴────────┴────────┴────────┴───────────────── The high incidence of pneumonia among measles patients coming into the hospital prior to, with, or immediately following the height of the influenza epidemic is very striking. It so happens that half of the total number of measles cases considered, date their onsets prior to October 15. From the 433 cases included in this first half, 42 cases of pneumonia arose, while from the 434 cases arising during the two months following October 15, only 14 or one-third as many cases of pneumonia developed. These figures very strongly suggest that influenza played a large part in the production of the pneumonia with measles in this group of cases. Again the 9.7 per cent incidence of pneumonia in the first half of cases considered, approaches the 12 per cent incidence of pneumonia following influenza observed in the epidemic at Camp Pike, while the incidence of 3.2 per cent in the second half of the cases conforms more nearly to figures for pneumonia following measles in the army prior to the pandemic of influenza. It has been shown that the prevalence of B. influenzæ at Camp Pike increased with the passing of the wave of influenza (p. 40) and that this increase applied to the measles admissions. For a time the separation of measles patients carrying B. influenzæ as identified by throat culture on admission, from those free from it, was practiced. All cases were then followed up by weekly throat cultures, and cases in negative wards on being identified as positives were transferred.