2021, 46(06): 596-603.
Abstract Objective The clinical distribution and drug resistance of methicillin-resistant Staphylococcus
aureus (MRSA) was studied from 2015 to 2019 to provide suggestions for clinical rational drug use and infection
control. Methods 461 strains of MRSA isolated from the People's Hospital of Inner Mongolia Autonomous Region
from January 2015 to December 2019 were retrospectively analyzed in the aspects of the source of specimens, the
distribution of departments, the changing trend of detection rate and drug resistance rate. The drug resistance of 461 strains of MRSA and 1007 strains of methicillin sensitive Staphylococcus aureus (MSSA) were compared and
analyzed. The data were analyzed by Whonet 5.6 software and SPSS 22.0 software. Results The detection rates of
MRSA from 2015 to 2019 were 40.70%, 24.75%, 26.83%, 34.33%, and 30.72%, with an average of 31.34%. MRSA
was mainly distributed in the ICU ward, the cadre health care ward, neurosurgery, neurology, and pediatrics, with the
constituent ratios of 17.35%,16.70%,15.84%,12.80%, and 7.81%, respectively. The Department of Neurology had the
highest detection rate of MRSA (74.68%). The detection rate of MRSA in ICU (64%) was significantly higher than
that in non-ICU wards (28.31%,P<0.05). MRSA was mainly isolated from sputum, secretion, blood, pus, and urine,
with the constituent ratios of 52.28%, 20.61%, 9.76%, 5.42%, and 4.34%, respectively. The detection rate of MRSA
in sputum was 60.40%, which was the highest detection rate and was significantly higher than that in non-sputum
samples (20.52%, P<0.05). From 2015 to 2019, the drug resistance rates of MRSA to erythromycin, nitrofurantoin,
linezolid, vancomycin, and quinuptin/dafurtin had little change (P>0.05); the drug resistance rates to gentamicin,
rifampicin, ciprofloxacin, levofloxacin, moxifloxacin, clindamycin, and tetracycline showed a downward trend
(P<0.05). The 5-year average drug resistance rate was 50%~100%; the resistance rate to cotrimoxazole showed an
upward trend (P<0.05). Compared with MSSA, MRSA had higher resistance rates to penicillin, gentamicin, rifampicin,
ciprofloxacin, levofloxacin, moxifloxacin, clindamycin, erythromycin, nitrofurantoin, and tetracycline(P<0.05),
except linezolid, vancomycin, and quinuputin/dapfoptin. However, the resistance rate of MSSA to cotrimoxazole was
significantly higher than that of MRSA(P<0.05). Conclusion MRSA is mainly distributed in ICU, mainly from
sputum. MRSA infection has decreased slightly in the past five years, but the detection rate of MRSA is still around
30%, showing multiple drug resistance. Therefore, the hospital should strengthen the management of antimicrobial
agents, bacterial resistance monitoring, hand hygiene, disinfection and isolation, and other measures to effectively
control the infection and drug resistance of MRSA.