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Principal-component analysis (PCA) comparison of growth characteristics of environmental versus clinical L. pneumophila isolates. PCA was conducted on covariance and included the following variables: maximal specific growth rates (μm), lag-phase length (λ), and maximal cell densities at five studied temperatures (25, 30, 37, 42, and 45°C). Ellipses represent the log normal distributions of principal-component values for the clinical (red) and environmental (blue) isolates.
