Results
Undulant fever was endemic to the islands with periodic outbreaks of major epidemics (see Figure 2). Since there was no significant difference in the mean number of cases between Malta and Gozo, the brucellosis numbers for the two islands were pooled. The mean number of undulant fever cases was 3.611 per 1000 living over the study period.
Figure 2. Undulant fever cases in the Maltese Islands: 1919-1954.