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. 2005 Nov;11(11):1730–1737. doi: 10.3201/eid1111.040659

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Scatterplot of antibody titers of the 247 seropositive study participants (titers of the same participant measured at different times are connected); superimposed is the fitted mean curve (in red) of log2 (antibody titer) between weeks 3 and 13 postinfection based on the linear mixed model by severity (duration of illness) and sex at the median age of 36 years. Each dot represents >1 titer; no distinction is made between single values and those with >1 value.