
To determine:
The cause of the increase in CA-MRSA hospital admission.
Introduction
MRSA strains of bacteria are present on the skin of healthy people. Methicillin-resistant Staphylococcus aureus (MRSA) is the causative agent of skin and soft tissue infection in non hospitalized people. As the name suggests these bacteria are resistant to methicillin antibiotics.

Explanation of Solution
Methicillin-resistant Staphylococcus aureus is a resistant strain of Staphylococcus aureus. Methicillin is related to the penicillin. This methicillin is effective against Staphylococcus aureus but now due to the mutation, the bacteria Staphylococcus aureus became resistant towards the antibiotics. Staphylococcus aureus is a Gram-positive cocci shaped bacteria. They appear in clusters and are nonmotile bacteria. These bacteria contain superantigens, which cause diseases in human. These bacteria are highly virulent, but also present on the skin as normal microflora.
MRSA strains of bacteria have been associated with the hospitals. This is because, in hospitals, there is a higher concentration of patients who suffered from another infected disease or immunocompromised patients that require antibiotics are present. So, the bacteria easily get mutated and developed resistance to antibiotics. Due to this, the hospital-acquired methicillin-resistant S. aureus infection gets an increase.
The immunity of the people present in the hospital is low, which increases the risk of S. aureus infection.
To determine:
The groups are most susceptible to CA-MRSA.
Introduction
MRSA strains of bacteria are present on the skin of healthy people. Methicillin-resistant Staphylococcus aureus (MRSA) is the causative agent of skin and soft tissue infection in non hospitalized people. As the name suggests these bacteria are resistant to methicillin antibiotics.

Explanation of Solution
The studies show that CA-MRSA disease was higher in patients who were suffering from HIV, and diabetes disease. These individuals have tended to form skin lesions or open sores which permit the entry of S. aureus. Thus, the numbers of immunocompromised patients in hospitals are more, which allow bacteria to easily cause disease in these patients.
The patients who are suffering from HIV and diabetes are higher prone to MRSA infection.
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Chapter 18 Solutions
Microbiology: A Systems Approach
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