Fig. 1From: Extensively drug-resistant Haemophilus influenzae – emergence, epidemiology, risk factors, and regimenDrug non-susceptibility in Haemophilus influenzae. a Incidences of drug non-susceptibility to different antimicrobial agents in H. influenzae isolates from 2007 to 2018 (n = 2091) are shown. Fisher’s exact tests or Pearson Chi-square tests were used to assess the significance of the non-susceptible rate of each drug in each year when compared to the overall mean value. *P < 0.05, **P < 0.01, ***P < 0.001. x̄, mean value. b Comparisons of drug non-susceptibility rates in β-lactamase-positive and β-lactamase-negative H. influenzae isolates. P-values are obtained from Fisher’s exact testsBack to article page