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Choice B reason: This is not the correct answer, as the reservoir is the second link in the chain of infection. It is the place where the infectious agent lives and grows, such as humans, animals, plants, soil, or water.

Choice C reason: This is not the correct answer, as the portal of exit is the third link in the chain of infection. It is the way that the infectious agent leaves the reservoir, such as through body fluids, skin, mucous membranes, or respiratory tract.

Choice D reason: This is not the correct answer, as the mode of transmission is the fourth link in the chain of infection. It is the way that the infectious agent travels from one host to another, such as through direct or indirect contact, droplet, airborne, vector, or vehicle transmission.

Choice B reason: This is not the correct answer, as contact precautions are additional infection control practices that should be used for patients who have infections that can be spread by direct or indirect contact with the patient or their environment. They include wearing gloves and gowns, using dedicated equipment, and limiting patient movement outside the room. A semi-private room may also increase the risk of cross-contamination between patients.

Choice C reason: This is not the correct answer, as airborne precautions are additional infection control practices that should be used for patients who have infections that can be spread by small droplets that remain in the air for long periods of time and can be inhaled by others. They include wearing a respirator, placing the patient in a negative pressure room with an air filtration system, and limiting patient movement outside the room.

Choice D reason: This is not the correct answer, as droplet precautions are additional infection control practices that should be used for patients who have infections that can be spread by large droplets that are generated by coughing, sneezing, or talking and can be transmitted to others who are within 3 feet of the patient. They include wearing a surgical mask, placing the patient in a private room or cohorting with other patients with the same infection, and limiting patient movement outside the room. A positive pressure room may also increase the risk of spreading the infection to other areas of the hospital.

Choice B reason: This is not the correct answer, as gloves and masks are not the appropriate PPE to wear when performing urinary catheter care for a patient who has a UTI. The mask protects the nurse's mouth and nose from exposure to respiratory droplets, which are not a mode of transmission for UTIs.

Choice C reason: This is not the correct answer, as gloves and eye protection are not the appropriate PPE to wear when performing urinary catheter care for a patient who has a UTI. Eye protection protects the nurse's eyes from exposure to splashes or sprays of blood or body fluids, which are unlikely to occur during urinary catheter care.

Choice D reason: This is not the correct answer, as gloves are not sufficient PPE to wear when performing urinary catheter care for a patient who has a UTI. Gloves protect the nurse's hands from exposure to urine, but they do not protect the nurse's clothing and skin from contamination by urine or other body fluids.

Choice A reason: This is not the correct answer, as gloves and gown are not sufficient PPE to wear when entering the room of a patient who has measles. Gloves protect the nurse's hands from exposure to blood or body fluids, and the gown protects the nurse's clothing and skin from contamination by blood or body fluids, but they do not protect the nurse's respiratory tract from exposure to airborne droplets that contain the measles virus.

Choice B reason: This is not the correct answer, as gloves and mask are not sufficient PPE to wear when entering the room of a patient who has measles. Gloves protect the nurse's hands from exposure to blood or body fluids, and mask protects the nurse's mouth and nose from exposure to large droplets that are generated by coughing, sneezing, or talking, but they do not protect the nurse's respiratory tract from exposure to small droplets that remain in the air for long periods of time and can be inhaled by others.

Choice C reason: This is not the correct answer, as gloves and eye protection are not sufficient PPE to wear when entering the room of a patient who has measles. Gloves protect the nurse's hands from exposure to blood or body fluids, and eye protection protects the nurse's eyes from exposure to splashes or sprays of blood or body fluids, but they do not protect the nurse's respiratory tract from exposure to airborne droplets that contain the measles virus.

Choice B reason: This is not the correct answer, as droplet precautions are indicated for patients who have infections that can be spread by large droplets that are generated by coughing, sneezing, or talking and can be transmitted to others who are within 3 feet of the patient. CDI is not spread by respiratory droplets.

Choice C reason: This is not the correct answer, as airborne precautions are indicated for patients who have infections that can be spread by small droplets that remain in the air for long periods of time and can be inhaled by others. CDI is not spread by airborne droplets.

Choice D reason: This is not the correct answer, as neutropenic precautions are indicated for patients who have low white blood cell counts and are at risk of developing infections from normal flora or environmental sources. CDI is not caused by normal flora or environmental sources, but by an overgrowth of a bacterium that is usually present in small amounts in the intestine.

reason: This action should be taken by the nurse to prevent cross-contamination, as it helps protect the nurse and other patients from exposure to MRSA, which can be transmitted through direct or indirect contact with infected skin or wounds.

reason: This action should be taken by the nurse to prevent cross-contamination, as it helps prevent the transmission of MRSA, which can survive on surfaces or objects for long periods of time.

reason: This action should be taken by the nurse to prevent cross-contamination, as it helps eliminate MRSA, which can be resistant to many disinfectants and antibiotics.

Choice A reason: This is not the correct answer, as contact precautions are indicated for patients who have infections that can be spread by direct or indirect contact with the patient or their environment. Influenza is not spread by contact, but by respiratory droplets.

Choice C reason: This is not the correct answer, as airborne precautions are indicated for patients who have infections that can be spread by small droplets that remain in the air for long periods of time and can be inhaled by others. Influenza is not spread by airborne dropletsunless it is a novel strain that has the potential to cause a pandemic.

Choice D reason: This is not the correct answer, as neutropenic precautions are indicated for patients who have low white blood cell counts and are at risk of developing infections from normal flora or environmental sources. Influenza is not caused by normal flora or environmental sources, but by a virus that can infect the respiratory tract.