Methicillin Resistant Staphylococcus Aureus Bacteraemia (MRSA)

What is MRSA?

Staphylococcus aureus (S. aureus) is a germ that lives on the skin and mucous membranes of healthy people. Occasionally S. aureus can cause an infection. When S. aureus develops resistance to certain antibiotics, it is called methicillin-resistant Staphylococcus aureus, or MRSA.

What is bacteraemia?

Bacteraemia is the presence of bacteria in the bloodstream and is referred to as a bloodstream infection.

How does MRSA spread?

MRSA is spread from one person to another by contact, usually on the hands of caregivers. It can be present on the caregiver’s hands either from touching contaminated material excreted by the infected person or from touching articles contaminated by the skin of a person with MRSA, such as towels, sheets and wound dressings. MRSA can live on the hands and objects in the environment.

Surveillance at Holland Bloorview

The method of calculation of the MRSA bacteraemia infection rate for the reporting period (on a quarterly basis) is: Number of nosocomial patients with laboratory identification of MRSA bacteraemia x 1000 Total number of patient days.

Where the numerator is the total number of newly identified cases for MRSA bacteraemia associated with the reporting facility, for the reporting period.

The denominator is the total number of in patient days for the reporting period. There are no exclusion criteria. For smaller facilities that have only a small inpatient population, like Holland Bloorview, MRSA rates may vary from month to month. In fact, the smaller the facility, the greater the rates will vary, because a change in even one case in a small facility will cause the rate to go up or down considerably.


MRSA Surveillance 2018

MRSA Surveillance 2017

MRSA surveillance 2016

MRSA surveillance 2015

MRSA surveillance 2014

MRSA surveillance 2013

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