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Contributors JTLB, VC and JDK designed the study. MAM collected the milk specimens. JTLB, CD and VC performed the microbiology experiments. JTLB and JDK analysed the data. JTLB wrote the first draft of the manuscript. JTLB, MAM, CD, VC and JDK critically revised the manuscript. All authors approved of the final manuscript.
Funding This work was supported by a career development award from Research to Prevent Blindness (JDK).
Competing interests None.
Ethics approval University of California, San Francisco Committee on Human Research.
Provenance and peer review Not commissioned; internally peer reviewed.
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