An answer to your question is much more difficult than you would expect. However, it is likely that your limitations period is 2 years from the date you contracted MRSA. Medical malpractice claims are very complicated and difficult and they really do require the assistance of an attorney experienced in this area. Medical malpractice cases also usually requiring the hiring of an expert witness to testify that your contracting MRSA was a result of negligence on the part of the doctor or clinic or hospital (whoever you are wishing to sue). However, some state laws allow for a longer statute of limitations period if you did not find out about the injury/negligence until a period of time after it actually occurred. A lawyer will not be able to tell you the exact date your statute of limitations period started to run without reviewing all your medical records related to this incident -- it all depends on the facts of your individual potential case. I recommend contacting a medical malpractice attorney in your area and try to get a consultation (most are free). They will probably want to review your medical records off the bat so it may be a good idea to go ahead and start requesting them. I hope this information helps. Best of luck!
NOTE: This response is general in nature and should not be considered legal advice. No attorney-client relationship exists or is formed by this information.