Infection Cycle

Every question here, with the answer

1. A nurse is preparing to use a shared vital signs machine after it was taken from another patient’s room. Which action best breaks the chain of infection at the method-of-transmission link?

   1. Ask whether the previous patient is in the convalescent period.
   2. Determine whether the microorganism is part of the previous patient’s resident flora.
   3. Assess whether the next patient has protective antibodies from a previous infection.
   4. Perform hand hygiene and ensure the equipment is properly cleaned before using it with the next patient.

   Answer: Perform hand hygiene and ensure the equipment is properly cleaned before using it with the next patient.

   Indirect transmission in the hospital can occur through ineffective hand hygiene and improperly cleaned equipment. Cleaning shared equipment and performing hand hygiene directly addresses this route of spread, while the other options assess host immunity, infection stage, or flora rather than interrupting transmission.

2. A nurse is reviewing how an infection spreads from one person to another. Which elements are required links in the chain of infection? Select all that apply.

   1. A convalescent period
   2. A susceptible host
   3. A means of exit from the body
   4. A method of spread
   5. A causative agent

   Answer: A susceptible host, A means of exit from the body, A method of spread, A causative agent

   The chain of infection requires specific links, including a causative agent, exit route, transmission method, entry route, source, and susceptible host. The convalescent period is a stage of infection, not one of the required chain links.

3. A patient with a respiratory infection coughs while speaking with the nurse. Which explanation best describes droplet transmission in this situation?

   1. The pathogen is transmitted by blood-feeding arthropods such as fleas, ticks, or mosquitos.
   2. The pathogen remains suspended in the air for long durations and floats considerable distances.
   3. The pathogen spreads only when contaminated equipment is moved from one patient’s room to another.
   4. The pathogen travels in droplets released by coughing, sneezing, or talking and is typically inhaled through the nose, mouth, or eyes.

   Answer: The pathogen travels in droplets released by coughing, sneezing, or talking and is typically inhaled through the nose, mouth, or eyes.

   Droplet transmission occurs when water droplets are released during coughing, sneezing, or talking and are inhaled through the nose, mouth, or eyes. Remaining suspended for long periods describes airborne transmission; arthropods describe vector transmission; and contaminated equipment describes indirect transmission.

4. A nurse is assessing hospitalized patients for portals of entry for pathogens. Which findings should the nurse recognize as portals of entry in the healthcare setting? Select all that apply.

   1. An indwelling catheter
   2. A surgical site
   3. A wound
   4. An intravenous access site
   5. Intact skin with no injury

   Answer: An indwelling catheter, A surgical site, A wound, An intravenous access site

   Wounds, surgical sites, intravenous access sites, and indwelling catheters can allow pathogens to enter the body. Intact skin is a primary defense barrier, not a portal of entry unless its integrity is compromised.

5. A patient reports feeling healthy after exposure to an infectious person, but the nurse knows the pathogen may be multiplying and the patient may still spread it. Which stage of infection is the patient most likely in?

   1. Illness period
   2. Incubation period
   3. Convalescent period
   4. Prodromal stage

   Answer: Incubation period

   During the incubation period, the patient has no signs or symptoms because there are not yet enough pathogens to cause symptoms, but pathogens are multiplying and may spread. The prodromal stage has vague symptoms, the illness period has disease-specific symptoms, and the convalescent period is recovery.

6. A nurse is teaching a patient about the body’s primary defense barriers against infection. Which statements should the nurse include? Select all that apply.

   1. Mucous membranes trap pathogens, and coughing or sneezing can expel them.
   2. Eyelashes, eyelids, blinking, and tears help protect against airborne microorganisms.
   3. The acidic environment of the stomach destroys pathogens that enter the digestive tract.
   4. Intact skin provides a physical barrier to infection.
   5. Specific antibodies are the continuous first line of defense against infection.

   Answer: Mucous membranes trap pathogens, and coughing or sneezing can expel them., Eyelashes, eyelids, blinking, and tears help protect against airborne microorganisms., The acidic environment of the stomach destroys pathogens that enter the digestive tract., Intact skin provides a physical barrier to infection.

   Primary defenses include skin, mucous membranes, stomach acidity, and eye structures that block, destroy, or flush pathogens. Specific antibodies are part of specific defense, not the continuous primary defense barriers described in this section.