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. 2003 May;9(5):545–551. doi: 10.3201/eid0905.020441

Table 1. Distribution of milk samples over duration of lactation in the two study cohorts.

          No. days of lactation           Mexico (%)           United States (%)
          <5
           16 (22)
           11 (22)
          6–30
           43 (59)
           30 (60)
          >30
           14 (19)
           9 (18)
          Total           73 (100)           50 (100)