The incidence of methicillin-susceptible Staphylococcus aureus (MSSA) bacteraemia has increased by 32% during the last 7 years, according to new figures from Public Health England (PHE).
In its latest Health Protection Report, PHE reports that reported cases of MSSA increased by 38% from 2199 in the period January-March 2011 to 3037 in January-March 2018. This was accompanied by a 32% increase in the incidence rate (per 100,000 population) from 16.8 per 100,000 population in 2011 to 22.1 per 100,000 population in 2018.
The increase has been driven largely by an increase in community-onset cases. During the period January 2011 to March 2018, counts and incidence rates of community-onset cases increased by 56% and 49%, respectively, from 1464 to 2283 cases and from 11.2 to 16.6 cases per 100,000 population. In comparison, counts and incidence rate of hospital-onset cases increased by 3% (735 to 754 cases) and 2% (8.4 to 8.5 cases per 100,000 bed-days), respectively.
When comparing the most recent quarter with the same period last year (January to March 2017 and January to March 2018), the incidence rate of hospital-onset MSSA bacteraemia decreased by 3% (from 8.8 to 8.5 cases per 100,000 bed-days) compared with a 3% increase in incidence rate of community-onset cases (from 16.2 to 16.6 cases per 100,000 population) during the same period.