A methicillin-sensitive Staphylococcus aureus (MSSA) infection is an infection caused by the staph bacteria which is able to be treated with most penicillin based antibiotics and has yet become resistant to the more common antibiotics enabling the treatment to be cleared up easier than it would be if it was resistant in the case of MRSA.
Although the staph bacteria is common a MSSA infection can cause as many problems as the well known MRSA bug but, in theory it is easier to treat with a vast array of antibiotics.
MSSA can be found on many people and would not cause any harm whatsoever. It is only when the bug is able to enter your system and when you are very ill that it would cause you any serious damage and would become part of the infectious diseases that need to be treated within a hospital environment.
Most staph infections can be killed by using basic hygiene rules such as hand-washing and antibacterial gels.