Consider the following medical report that includes the patient's historical health records. Use it to predict the disease that the patient is high likely exposed to. 

 Medical Report: allergies: no known allergies / adverse drug reactions attending: addendum: keflex 500mg four times daily for 10 days for sternal drainage. prescription provided. discharge disposition: home with service facility: hospice program md procedure: extracorporeal circulation auxiliary to open heart surgery open heart valvuloplasty of mitral valve without replacement diagnoses: mitral valve disorders unspecified essential hypertension personal history of tobacco use 

Answer: The patient is high likely exposed to