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Table 1 Characterization of all possible observed male-female interactions

From: Onset of a pandemic: characterizing the initial phase of the swine flu (H1N1) epidemic in Israel

   male female Sum.
Infector male 41 (40.32) 46 (46.6) 87
  female 16 (16.68) 20 (19.31) 36
  Sum. 57 66 122
  1. For example there were 57 infected males, of which 41 contracted influenza from male infectors, while 16 contracted influenza from female infectors. The numbers given in brackets are the expected number of interactions determined from a standard contingency table analysis.