Prevalence, sequence type, and quinolone resistance of Neisseria lactamica carried in children younger than 15 years in Shanghai, China - 15/01/20
Highlights |
• | First report describing the epidemiology of N. lactamica in China. |
• | Lower genetic diversity of the N. lactamica isolates in China than in other countries. |
• | N. lactamica quinolone resistance is more prevalent in China than in other countries. |
• | Potential for quinolone resistance transfer from N. lactamica to N. meningitidis. |
Summary |
Objective |
Neisseria lactamica has an important influence on carriage and antimicrobial susceptibility of N. meningitidis, a major pathogen of septicemia and meningitis. In China, quinolone resistance is highly prevalent in N. meningitidis but unknown in N. lactamica. This study investigates the carriage rate, sequence type, and ciprofloxacin resistance of N. lactamica in children in China.
Methods |
During 2014–2016, throat swabs were collected from 2,239 children in Shanghai. The ciprofloxacin minimum inhibitory concentrations of the isolates were determined by the agar dilution method.
Results |
The overall carriage rate of N. lactamica was higher (8.9%) than that of N. meningitidis (0.9%) and peaked at two years (37.1%). The resistance frequency of N. lactamica to ciprofloxacin was 98.5% (197/200). There were 65 sequence types (STs). Clonal complex (cc) 640 (45.5%) dominated, while ST-14031 was predominant (37%, 74/200). All isolates possessed a GyrA mutation; 17 isolates (8.5%) harbored additionally a ParC mutation. Assigned to 39 different alleles, the gyrA sequences from these N. lactamica isolates formed an N. lactamica cluster, which also included eight alleles from N. meningitidis.
Conclusion |
The N. lactamica isolates in China showed distinct characteristics with lower genetic diversity and a much higher prevalence of quinolone resistance than in other countries.
Le texte complet de cet article est disponible en PDF.Keywords : Neisseria lactamica, Quinolone resistance, Multilocus sequence typing (MLST), gyrA, parC, Horizontal gene transfer
Plan
Vol 80 - N° 1
P. 61-68 - janvier 2020 Retour au numéro
Article précédent
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