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    Determinants of mastitis in women in the CASTLE study: a cohort study

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    Author
    Cullinane, M; Amir, LH; Donath, SM; Garland, SM; Tabrizi, SN; Payne, MS; Bennett, CM
    Date
    2015-12-16
    Source Title
    BMC Family Practice
    Publisher
    BIOMED CENTRAL LTD
    University of Melbourne Author/s
    Bennett, Catherine; Wark, Suzanne; Donath, Susan; Tabrizi, Sepehr; Amir, Lisa
    Affiliation
    Melbourne School of Population and Global Health
    Obstetrics and Gynaecology
    Paediatrics (RCH)
    Metadata
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    Document Type
    Journal Article
    Citations
    Cullinane, M., Amir, L. H., Donath, S. M., Garland, S. M., Tabrizi, S. N., Payne, M. S. & Bennett, C. M. (2015). Determinants of mastitis in women in the CASTLE study: a cohort study. BMC FAMILY PRACTICE, 16 (1), https://doi.org/10.1186/s12875-015-0396-5.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/258054
    DOI
    10.1186/s12875-015-0396-5
    Abstract
    BACKGROUND: Mastitis is an acute, debilitating condition that occurs in approximately 20 % of breastfeeding women who experience a red, painful breast with fever. This paper describes the factors correlated with mastitis and investigates the presence of Staphylococcus aureus in women who participated in the CASTLE (Candida and Staphylococcus Transmission: Longitudinal Evaluation) study. The CASTLE study was a prospective cohort study which recruited nulliparous women in late pregnancy in two maternity hospitals in Melbourne, Australia in 2009-2011. METHODS: Women completed questionnaires at recruitment and six time-points in the first eight weeks postpartum. Postpartum questionnaires asked about incidences of mastitis, nipple damage, milk supply, expressing practices and breastfeeding problems. Nasal and nipple swabs were collected from mothers and babies, as well as breast milk samples. All samples were cultured for S. aureus. "Time at risk" of mastitis was defined as days between birth and first occurrence of mastitis (for women who developed mastitis) and days between birth and the last study time-point (for women who did not develop mastitis). Risk factors for incidence of mastitis occurring during the time at risk (Incident Rate Ratios [IRR]) were investigated using a discrete version of the multivariable proportional hazards regression model. RESULTS: Twenty percent (70/346) of participants developed mastitis. Women had an increased risk of developing mastitis if they reported nipple damage (IRR 2.17, 95 % CI 1.21, 3.91), over-supply of breast milk (IRR 2.60, 95 % CI 1.58, 4.29), nipple shield use (IRR 2.93, 95 % CI 1.72, 5.01) or expressing several times a day (IRR 1.64, 95 % CI 1.01, 2.68). The presence of S. aureus on the nipple (IRR 1.72, 95 % CI 1.04, 2.85) or in milk (IRR 1.78, 95 % CI 1.08, 2.92) also increased the risk of developing mastitis. CONCLUSIONS: Nipple damage, over-supply of breast milk, use of nipple shields and the presence of S. aureus on the nipple or in breast milk increased the mastitis risk in our prospective cohort study sample. Reducing nipple damage may help reduce maternal breast infections.

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