MRSA is the methicillin-resistant Staphylococcus aureus. The six links in the transmission of MRSA are:
Reservoir of the bacteria
Methicillin-resistant Staphylococcus aureus
Susceptible host that be can be infected
Portal of entry of MRSA into the host
Mode of transmission of the spread of MRSA
Portal of exit of MRSA from the host