Figure 2From: Temporal and spatial patterns of serologic responses to Plasmodium falciparum antigens in a region of declining malaria transmission in southern ZambiaIgG antibody levels to P. falciparum whole antigen expressed as optical density values by age: A. 2007, B. 2008 and C. 2009. A Lowess curve was fit to the data. The straight line indicates the threshold OD value established using the mean OD value plus three standard deviations.Back to article page