| a diphtheria epidemic in lesotho, 1989. did vaccination increase the population's susceptibility? | we report a diphtheria outbreak which occurred in the 1st 6 months of 1989 in the quthing district of lesotho in southern africa. sixty-eight clinical cases were identified in patients with ages ranging from 14 months to 51 years. the 10-15-year age group represented 38% of the cases and the 15-20-year age group another 26%. age-adjusted incidence rates were higher in patients aged between 15 and 35 than in those aged 0-15 years (p < 0.001). the overall case fatality rate was 23%. most deaths oc ... | 1993 | 7681640 |