I need answer for the following 2 questions...... Thanks!

1) Vancomycin-resistant Enterococcus faecalis was isolated from a foot infection of a 40-year old man. The patient had a chronic diabetes-related foot ulcer and underwent amputation of a gangrenous toe. He subsequently developed methicillin-resistant Staphylococcus aureus bacteremia. The infection was treated with vancomycin. One week later, he developed a vancomycin-resistant S. aureus (VRSA) infection. This is the first case of VRSA in the U.S. What is the most likely source of the VRSA?
2) A patient with streptococcal sore throat takes penicillin for two days of a prescribed 10 day regimen. Because he feels better, he then saves the remaining penicillin for some other time. After three more days, he suffers a relapse of the sore throat. Discuss the probable cause of the relapse.