Varieties of staphylococcus aureus that are resistant to the drug methicillin see concept 22.3 (page 475) view available hint(s) varieties of staphylococcus aureus that are resistant to the drug methicillin see concept 22.3 (page 475) developed in response to the use of methicillin already existed in the population before methicillin was developed always have an advantage in every environment were strongly selected for as methicillin became widely used to treat bacterial infections the second and fourth answers are correct. submit