MRSA is Methicillin Resistant Staphylococcus Aureus. Methicillin used to be nicknamed "gorilla-cillin". Which of the following statements is likely true of MRSA INFECTIONS IN HUMANS?
1. Methicillin is not a good antibiotic to use on this type of infection
2. MRSA is a common infection that is treated by methicillin
3. MRSA originally evolved in gorillas as a zoonotic disease
4. Methicillin is a strong antibiotic and MRSA developed resistance to it, making it harder to treat