Final answer:
The provided references do not give a specific number of MRSA infections in 2007. MRSA is a bacteria resistant to multiple antibiotics, causing infections in healthcare settings and the community. The average age for community-associated MRSA (CA-MRSA) is much younger than in healthcare settings.
Step-by-step explanation:
The query about the number of people who had a MRSA infection in 2007 is rooted in the field of medicine, particularly in epidemiology and public health. Methicillin-resistant Staphylococcus aureus (MRSA) is a bacterium responsible for several difficult-to-treat infections in humans.
Due to its resistance to commonly used antibiotics such as methicillin, amoxicillin, penicillin, and oxacillin, MRSA represents a significant health threat. Community-associated MRSA (CA-MRSA) infections, in particular, have been a concern as they target a younger demographic outside of healthcare settings with an average age of 23, contrasting with an average age of 68 among those in healthcare facilities.
Unfortunately, the provided references do not specify the exact number of MRSA cases in 2007. To obtain accurate figures for MRSA infections during that year, one would typically refer to databases or studies from organizations such as the Centers for Disease Control and Prevention (CDC) or the Journal of the American Medical Association, which track and analyze infection rates. In academic settings, it is critical that claims are supported by data, so for precise numbers, one should consult the official reports or scientific literature published in that specific time frame.