Final answer:
MRSA is particularly common among hospital patients, athletes in contact sports, and individuals in crowded environments. It also poses a risk to people with compromised immune systems.
Step-by-step explanation:
Infections with MRSA (methicillin-resistant Staphylococcus aureus) are particularly common in three key groups:
Hospital patients, especially because they may be more susceptible to infection due to weakened immune systems or other health conditions.
Athletes in contact sports, because Staphylococcus aureus is spread easily through skin-to-skin contact.
Individuals living in crowded conditions, such as military personnel and prisoners, who live or work in tight populations making it easier for the bacteria to spread.
Additionally, people with compromised immune systems are at a higher risk because they are less able to fight off infections.