UNLABELLED: Mastitis is a common maternal health problem which can lead to serious infant health problems such as poor growth and HIV infection. Anti-secretory factor (AF), which can be induced in milk by maternal consumption of a low-cost cereal product, has been associated with decreased mastitis. CONCLUSION: Consumption of cereals which induce AF should be investigated as a potential intervention in less-developed countries where the consequences of mastitis for infants are most severe.