If a resident has recently acquired MRSA, which of the following locations is most likely the source?

The correct answer is nursing home because these facilities often house individuals who are more vulnerable to infections, such as the elderly or those with weakened immune systems. MRSA, or Methicillin-resistant Staphylococcus aureus, can spread easily in settings where people are in close quarters and may have open wounds or compromised skin integrity. Nursing homes typically have a higher concentration of such individuals, making the transmission of MRSA more likely.

In a nursing home setting, factors such as shared living spaces, communal activities, and direct care from staff can facilitate the spread of MRSA. Furthermore, the presence of healthcare-associated infections is a significant concern in these environments due to the circulation of bacteria and potential for outbreaks.

Other environments like homes, colleges, or rooming houses can also harbor MRSA, but they typically do not possess the same concentrated risk factors found in nursing homes. For instance, while college campuses can have their share of infections due to close living arrangements and shared facilities, the population there is generally younger and healthier compared to nursing home residents. Similarly, homes and rooming houses may not have the same level of vulnerability among residents, further explaining why the nursing home is identified as the most likely source for newly acquired MRSA.