“…COME is reduced by adenoidectomy [van den Aardweg et al, 2010], oral steroids [Simpson et al, 2011] or ventilation tube (grommet) surgery [Browning et al, 2010], although effects may be short-lived. For CSOM, antibiotics may reduce otorrhoea [Macfadyen et al, 2006], as may tympanoplasty [Sarkar et al, 2009]. Figure 6 summarises factors known or hypothesised to have an impact on susceptibility to OM.…”