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Insights from a decade of surveillance: Molecular epidemiology of methicillin-resistant Staphylococcus aureus in Norway from 2008 to 2017.
PloS One 2024
AIM: Norway has a low prevalence of methicillin-resistant Staphylococcus aureus (MRSA) and reporting of all MRSA cases has been mandatory, including infections and carriage, since 1995 and 2005 accordingly. This provides a unique window to study the spread of MRSA in Norway over time. The aim of this study was to analyze the nationwide trends in the molecular epidemiology of MRSA in Norway over a period of 10 years.
METHODS: Clinical and epidemiological data as well as bacterial genotype (spa-type and PVL) were analyzed for all reported MRSA cases in Norway in the period 2008-2017.
RESULTS: During the study period, there were 15,200 MRSA cases reported in Norway, from 14,386 patients. The notification rate per 100,000 population increased by 15% annually, rising from 14.2 in 2007 to 48.6 in 2017. This increase was primarily driven by MRSA carriage and community-associated MRSA cases. The incidence of invasive infections remained stable and low, at less than 0.5. The incidence of healthcare-associated MRSA showed an increasing trend, while the number of outbreak-related cases, particularly those associated with nursing homes, decreased. Overall, there were significantly more MRSA infections in males than females. Interestingly, there was a significantly higher prevalence of MRSA infections in female young adolescents compared to males. spa-typing revealed a very heterogeneous MRSA population (D = 0.97), predominantly impacted by international travel and migration patterns, and less by domestic spread in the community.
CONCLUSIONS: This study highlights that Norway, while still classified as a low-prevalence country, has experienced a significant increase in the incidence of MRSA between 2008 and 2017, which can predominantly be attributed to CA-MRSA and MRSA carriage.
METHODS: Clinical and epidemiological data as well as bacterial genotype (spa-type and PVL) were analyzed for all reported MRSA cases in Norway in the period 2008-2017.
RESULTS: During the study period, there were 15,200 MRSA cases reported in Norway, from 14,386 patients. The notification rate per 100,000 population increased by 15% annually, rising from 14.2 in 2007 to 48.6 in 2017. This increase was primarily driven by MRSA carriage and community-associated MRSA cases. The incidence of invasive infections remained stable and low, at less than 0.5. The incidence of healthcare-associated MRSA showed an increasing trend, while the number of outbreak-related cases, particularly those associated with nursing homes, decreased. Overall, there were significantly more MRSA infections in males than females. Interestingly, there was a significantly higher prevalence of MRSA infections in female young adolescents compared to males. spa-typing revealed a very heterogeneous MRSA population (D = 0.97), predominantly impacted by international travel and migration patterns, and less by domestic spread in the community.
CONCLUSIONS: This study highlights that Norway, while still classified as a low-prevalence country, has experienced a significant increase in the incidence of MRSA between 2008 and 2017, which can predominantly be attributed to CA-MRSA and MRSA carriage.
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