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Table 1 Carrier rates and prevalence of β-lactamase production in H. influenzae isolates among children younger than five years old with ARI

From: Nasopharyngeal carriage and antimicrobial susceptibility of Haemophilus influenzae among children younger than 5 years of age in Beijing, China

Years No. of cases No. of isolates (%) β-lactamase production (%) 1
2000 292 103 (35.5) 4/100 (4.0)
2002 490 101 (20.6) 13/100 (13.0)
Total 2000 and 2002 782 204 (26.1) 17/200 (8.5)
2010 487 70 (14.4) 19/70 (27.1)
2012 395 74 (18.7) 23/74 (31.0)
Total 2010 and 2012 882 144 (16.3) 42/144 (29.2)
  1. 1The numbers tested for β-lactamase were not same as the number of isolates in 2000 and 2002 because four strains died before being tested.