Figure 1.

Bacterial community composition for (a) Infants #3 A, #4 A, #8 A, #9 A and #11 A (b) sibling Infants #19 A and #21 A (relative to each infant's birth date) from the 2011–2012 cohort. Red font indicates infants that were diagnosed with NEC. Curly brackets indicate periods in which antibiotics were administered (incomplete brackets indicate antibiotic treatment that extended outside of sampling period), stars indicate days in which NEC was diagnosed, red ovals indicate dates in which additional positive cultures (blood/tracheal aspirate) were available. In each time point, the abundance of all organisms with relative abundance <2% is summed and labeled as 'Rare' (see Supplementary Table S5 for the data underlying relative abundance plots).