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Table 1 Median cycle threshold (Ct) values and interquartile range (IQR) for microbes identified in throat and nasal swab samples. Non-acute samples were collected from Royal Thai Army barracks trainees at the start (R0) and at the end (RF) of each 10-week training period. Acute samples were collected from trainees who developed acute upper respiratory tract infection during follow-up. Percentages indicate the proportion of collected samples positive for each organism

From: Association between semi-quantitative microbial load and respiratory symptoms among Thai military recruits: a prospective cohort study

  Non-acute (n = 312) Acute (n = 145) p-valuea
R0 (n = 210) RF (n = 102)
% (n) Median Ct IQR % (n) Median Ct IQR % (n) Median Ct IQR
Bacteria
H. influenzae B 83.8 (176) 28.3 26.5–29.6 65.7 (67) 29.7 28.6–31.4 64.8 (94) 29.4 28.0–31.3 0.297
H. influenzae non-B 31.9 (67) 30.2 28.4–31.1 73.5 (75) 24.9 22.1–27.1 56.6 (82) 26.7 22.0–29.0 < 0.001
S. pneumoniae 8.1 (17) 29.6 27.7–30.7 34.3 (35) 28.0 26.1–31.0 15.2 (22) 27.1 26.5–29.2 0.706
K. pneumoniae 14.3 (30) 31.2 28.3–32.7 9.8 (10) 29.0 26.8–32.0 15.9 (23) 31.4 29.7–32.3 0.706
S. aureus 10.5 (22) 31.3 30.4–32.5 9.8 (10) 31.4 31.1–32.2 6.2 (9) 31.1 30.6–31.6 0.739
M. catarrhalis 2.4 (5) 30.6 27.7–31.5 3.9 (4) 32.6 32.2–32.8 6.2 (9) 29.7 29.5–31.5 0.564
L. pneumophila 2.4 (5) 32.1 31.4–32.4 2.0 (2) 31.3 30.3–32.4 2.8 (4) 32.5 31.2–32.8 0.317
Viruses
 Rhinovirus 1.9 (4) 30.6 28.6–31.8 15.7 (16) 30.2 27.2–31.7 26.9 (39) 28.9 26.9–31.4 < 0.001
 Adenovirus 0.5 (1) 27.2 27.2–27.2 9.8 (10) 30.5 29.6–31.4 2.8 (4) 29.3 27.0–31.0 0.083
 Influenza B 0 (0) 0 (0) 9.7 (14) 25.4 23.6–31.2
 Coronavirus 229 1 (2) 23.1 18.2–28.0 2.0 (2) 29.3 27.2–31.5 4.8 (7) 26.9 25.2–31.3 0.034
 Enterovirus 0.5 (1) 30.7 30.7–30.7 4.9 (5) 30.2 30.1–30.3 0 (0)
 Coronavirus 63 1 (2) 28.5 24.5–32.4 1.0 (1) 30.0 30.0–30.0 1.4 (2) 22.6 21.9–23.3 0.157
 Coronavirus HKU 0.5 (1) 30.0 30.0–30.0 0 (0) 2.1 (3) 32.2 31.6–32.9
 Parainfluenza 2 0.5 (1) 17.4 17.4–17.4 1.0 (1) 25.3 25.3–25.3 1.4 (2) 23.3 20.1–26.5 0.564
 Parainfluenza 4 0.5 (1) 32.0 32.0–32.0 0 (0) 1.4 (2) 30.3 30.0–30.6 0.317
 Coronavirus 43 0.5 (1) 28.1 28.1–28.1 0 (0) 0.7 (1) 32.6 32.6–32.6
 Bocavirus 0.5 (1) 17.4 17.4–17.4 0 (0) 0 (0)
 Influenza A 0 (0) 0 (0) 0.7 (1) 29.9 29.9–29.9
  1. ap-value for difference in proportion of positive samples in non-acute samples collected at the start (R0) of the training period or acute samples from individuals who developed URI during follow-up, as computed by McNemar test