Should i be concern because a co-worker has mrsa?

Wash your hads: Mrsa is likely more common than we think in healthy people. With a known carrier... Wash your hands, wash your hands, wash your hands. And minimize touching your face/nose. If you need to scratch... Use the back of your hand/forearm.

Yes: Good hand washing will be helpful and use a disinfectant to clean the phones, keyboards, etc.

Mrsa : Mrsa is passed by direct contact. The risk with casual contact is very low with good hygiene. There must be prolonged skin to skin contact