Merryn J. Netting’s research while affiliated with The University of Adelaide and other places

Atopic dermatitis (AD) is a chronic disease that is increasing in prevalence, particularly in children and people with skin of colour. Current management involves topical treatments, phototherapy and immunosuppressants, as well as newer therapies like dupilumab. Health professionals should also be aware of the specific management considerations for AD in people with skin of colour. This systematic review was conducted to examine global guidelines for the management of AD in children, compare management recommendations, examine specific recommendations for children with skin of colour, and assess the quality of the guidelines. The databases Medline, Embase, CINAHL, Scopus, Guidelines International Network, and Emcare Nursing and Allied Health were searched to identify guidelines or articles relating to the management of AD in children from 1990 to 2023. A grey literature search was also undertaken. The recommendations from the guidelines were extracted and compared, and the quality of the guidelines was assessed using the Appraisal Guidelines for Research and Evaluation (AGREE) II tool. A total of 1644 articles were identified from the initial search. Title and abstract screening, full text screening, and reference checking yielded 28 guidelines for the final appraisal and data extraction. The main variations in management recommendations were the timing of emollients, bleach baths, bath additives, oral antihistamines, and the age cut-offs for topical calcineurin inhibitors. Many guidelines were not updated to reflect newer therapies like dupilumab and topical phosphodiesterase-4 (PDE4) inhibitors. There were minimal recommendations regarding management of skin of colour. Only 12/28 guidelines met the satisfactory cut-off score for the AGREE II appraisal, largely due to a lack of well-documented methodology. This review showed that the recommendations for AD management in skin of colour were consistently lacking. Despite generally consistent management strategies over the last 5 years, less than half of the guidelines met high-quality criteria, emphasising the importance of using tools like AGREE II in future guideline development.

Aims To determine the effect of a two-week reduced fat and sugar and increased fibre maternal dietary intervention on the maternal faecal and human milk (HM) microbiomes. Methods and results Faecal swabs and HM samples were collected from mothers (n = 11) immediately pre-intervention, immediately post-intervention, and 4- and 8-weeks post-intervention, and were analysed using full-length 16S rRNA gene sequencing. Maternal macronutrient intake was assessed at baseline and during the intervention. Maternal fat and sugar intake during the intervention were significantly lower than pre-intervention (P=<0.001, 0.005, respectively). Significant changes in the bacterial composition of maternal faeces were detected after the dietary intervention, with decreases in the relative abundance of Bacteroides caccae (P=<0.001) and increases in the relative abundance of Faecalibacillus intestinalis (P = 0.006). In HM, the diet resulted in a significant increase in Cutibacterium acnes (P = 0.001) and a decrease in Haemophilus parainfluenzae (P=<0.001). The effect of the diet continued after the intervention, with faecal swabs and HM samples taken 4- and 8-weeks after the diet showing significant differences compared to baseline. Conclusion This pilot study demonstrates that short-term changes in maternal diet during lactation can alter the bacterial composition of the maternal faeces and HM. Clinical trial registration: Australian New Zealand Clinical Trials Registry (ACTRN12619000606189). Website: https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=377188&isReview=true.

Cow's milk allergy is rare in exclusively breastfed infants. To support the continuation of breastfeeding an infant after diagnosis with a cow's milk allergy, it is critical to examine the evidence for and against any form of cow's milk elimination diet for lactating mothers. In this narrative review, we highlight the lack of high-quality evidence, hence subsequent controversy, regarding whether the minuscule quantities of cow's milk proteins detectable in human milk cause infant cow's milk allergy symptoms. Current clinical practice recommendations advise a 2–4 week trial of maternal cow's milk dietary elimination for: a) IgE-mediated cow's milk allergy only if the infant is symptomatic on breastfeeding alone; b) non-IgE-mediated associated symptoms only if the history and examination strongly suggest cow's milk allergy; and c) infants with moderate to severe eczema/atopic dermatitis, unresponsive to topical steroids and sensitized to cow's milk protein. There should be a clear plan for home reintroduction of cow's milk into the maternal diet for a period of 1 week to determine that the cow's milk elimination is responsible for resolution of symptoms, and then subsequent reoccurrence of infant symptoms upon maternal cow's milk reintroduction. The evidence base to support the use of maternal cow's milk avoidance for the treatment of a breastfed infant with cow's milk allergy is of limited strength due to a lack of high-quality, adequately powered, randomised controlled trials. It is important to consider the consequences of maternal cow's milk avoidance on reducing immune enhancing factors in breast milk, as well as the potential nutritional and quality of life impacts on the mother. Referral to a dietitian is advised for dietary education, along with calcium and vitamin D supplementation according to local recommendations, and a maternal substitute milk should be advised. However, for most breastfed infants with cow's milk allergy maternal cow's milk dietary elimination will not be required, and active support of the mother to continue breastfeeding is essential.