Diphtheria Cases Reported in Australia, 1991-2026
Australia is experiencing its largest diphtheria outbreak since national records began
Chart showing diphtheria cases in Australia from 1991 to 2026.
The chart shows confirmed and probable diphtheria notifications by year. Data as of August 11, 2026. National disease reports do not publish exact annual counts below five; these are shown as zero, so totals may be slightly understated.
