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As the authors state correctly in the Methods section, serovar Patoc is non-pathogenic and therefore does not cause leptospirosis in humans but can act as a marker for a leptospiral infection. Remarkably, however, the abstract mentions Patoc to be the predominant serogroup diagnosed over time. This may confuse readers who are unfamiliar with leptospirosis. Besides, serovar Patoc belongs to serogroup Semaranga; there is no serogroup named Patoc. To assess the temporal and spatial distribution of serogroups in Denmark, titres against Patoc should have been ignored and data be based on only agglutination titres with pathogenic serovars. In case none of these have a positive titre (note that ≤ 1:100 indicated as cut-off titre should be ≥ 1:100) the label ‘probable infecting serogroup could not be determined’ would be appropriate.

Letter to the editor: Trends in human leptospirosis in Denmark, 1980 to 2012