Extended Data Fig. 4. Principal component analysis (PCA) biplot of disease severity by outcome of challenge.
Participants challenged with TN (n = 19) or wild-type (n = 21) S. Typhi based on the typhoid severity score. The data points are colored by outcome of challenge (yellow, typhoid diagnosis; blue, no typhoid diagnosis). The ellipses represent the 95% confidence levels for diagnosis status. The biplot arrows represent the contributions of individual variables to a given principal component, scaled according to their relative contribution36.