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Table 2 Data sources used to calculate the clinical attack rate among adults; CCS2 = second case control study.

From: A super-spreading ewe infects hundreds with Q fever at a farmers' market in Germany

Data source III Exposed Attack rate
(1) CCS2, interviewees in the telephone survey for the recruitment of controls 8 35 23%
(2) Adults who accompanied cases or controls (CCS2) 8 32 25%
(3) Cohort of sailor friends 3 9 33%
(4) Cohort of vendors 13 82 16%
Pooled (sources (1)-(4)) 32 158 20%
(5) Persons accompanying notified cases 26 84 31%
Pooled (sources (1)-(5)) 58 242 24%
  1. Persons accompanying notified cases (source 5) were a mixture of adults and children and are therefore listed separately.