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During the first year of life, maternal antibodies provide protection to infants against infectious diseases such as measles. The gestational age of the infant, maternal age, and whether the mother's immunity comes from vaccination or natural disease can affect the amount of maternal antibodies present. Investigators in Belgium prospectively examined maternal antibodies against measles in 207 women (age range, 18–40) and their 210 children between April 2006 and November 2008. Infants born before 36 weeks' gestation or weighing <2400 g were excluded, as were mothers and infants with impaired immune systems or who had received immunoglobulins or blood products during the study period. The authors set the protective antibody threshold level a…