Communicable Disease Basics
A disease that can be spread from one person to another.
What is a communicable disease?
Rationale: A communicable disease is a disease caused by an infectious agent that can be transmitted from one person to another, directly or indirectly. CNAs need to understand how diseases spread so they can use appropriate infection-control practices.
The first link in the chain of infection.
What is the infectious agent?
Rationale: The infectious agent is the microorganism capable of causing disease. If there is no infectious agent, there is no infection to transmit. Understanding the chain helps healthcare workers identify places where they can interrupt transmission.
The most important way healthcare workers prevent the spread of infection.
What is hand hygiene?
T or F: Gloves Replace the need for hand hygiene.
What is false?
Rationale: Gloves do not replace hand hygiene. Hands can become contaminated during glove application, removal, or through unnoticed tears or contamination. Hand hygiene must be performed at appropriate times.
This simple, 20-second practice using friction, warm water, and soap remains the single most effective way to prevent the spread of infection.
What is perform hand washing/hand hygiene?
Rationale: Friction physically destroys the cell membranes of microorganisms and loosens dirt, oil, and microbes from the skin's surface, allowing them to be rinsed away.
The term for a microorganism that can cause disease.
What is a pathogen?
Rationale: A pathogen is a microorganism capable of causing disease. Pathogens include organisms such as bacteria, viruses, fungi, and protozoa. Understanding pathogens helps CNAs understand why infection-control measures are necessary.
The term for the place where a pathogen lives and grows.
What is the reservoir?
Rationale: A reservoir is where an infectious agent normally lives and multiplies. Reservoirs can include people, animals, water, food, soil, and other environments.
This type of transmission occurs when a pathogen spreads through direct contact with an infected person.
What is direct contact transmission?
Rationale: Direct contact transmission occurs when microorganisms are transferred through physical contact between an infected or colonized person and another person. Appropriate hand hygiene and PPE when indicated help reduce this type of transmission
Always wear gloves when there is a reasonable possibility of contact with BBMS.
(Hint: what does BBMS stand for?)
What are blood, body fluids, mucous membranes, non-intact skin?
This specific type of personal protective equipment (PPE) must always be donned before entering a room under contact precautions and removed before exiting.
What is a gown?
Rationale: Gowns act as a protective barrier to prevent a healthcare worker's clothing from coming into direct contact with infectious agents or contaminated environmental surfaces in the resident's immediate environment.
The four major types of microorganisms that can cause infection.
What are bacteria, viruses, fungi, and protozoa?
Rationale: Different microorganisms behave differently and may require different precautions or treatments, but proper infection-control practices help reduce their transmission.
A pathogen leaves an infected person's body through a cough.
(Hint: Which link in the chain of infection is this?)
What is the portal of exit?
Rationale: The portal of exit is the way a pathogen leaves its reservoir. Respiratory secretions can leave the body through coughing or sneezing. Other portals of exit can include blood, urine, feces, or other body fluids.
This type of transmission occurs when a person sneezes and tiny droplets containing microorganisms travel to another person's eyes, nose, or mouth.
What is droplet transmission?
A CNA is preparing to provide personal care. The CNA has a small cut on their hand. The CNA should ___.
What is protect the cut appropriately and follow standard precautions/PPE requirements?
Rationale: Broken skin can provide a route for microorganisms to enter the body. The CNA should appropriately cover/protect the injury and follow facility infection-control procedures and PPE requirements.
This is the term for infections that residents or patients acquire while receiving treatment inside a healthcare facility that they did not have when they admitted.
What is a healthcare-associated infection? (Also accept: HAI or nosocomial infection)?
Rationale: HAIs commonly stem from cross-contamination via the hands of healthcare workers, invasive devices (like catheters), or improperly sanitized medical equipment, making rigid adherence to infection protocols vital
A resident has a fever, cough, and weakness. You notice these symptoms are different from the resident's normal condition.
(Hint: What should the CNA do?)
What is observe, report the change in condition according to facility policy, and follow appropriate infection-control precautions?
A CNA touches a contaminated surface and then touches a resident's wound without performing hand hygiene.
(Hint: What link in the chain of infection helped transmit the pathogen?)
What is the mode of transmission?
Rationale: The pathogen was transferred from one place to another through contact. The contaminated surface served as a source, and the CNA's hands provided a way for the microorganism to reach the resident's wound.
A healthcare provider touches a contaminated bedrail and then touches another resident or patient's bedside table. The pathogen is then transferred through an object. This type of transmission is called ___.
What is indirect contact transmission?
Rationale: Indirect contact transmission occurs when microorganisms are transferred through a contaminated object or surface rather than direct person-to-person contact. Environmental surfaces can become contaminated and serve as a way for pathogens to spread. These are called fomites.
After providing personal care, a healthcare professional should ___.
What is perform hand hygiene?
Rationale: Removing gloves does not guarantee that the hands are free of microorganisms. Hands may become contaminated during care or while removing gloves. Hand hygiene reduces the risk of transferring microorganisms to other people or surfaces.
When removing a full set of PPE, this item should always be removed first to prevent contaminating the rest of your attire and body.
What are gloves?
Rationale: Gloves are considered the most heavily contaminated piece of PPE because they directly handle the resident and bodily fluids. Removing them first ensures you do not transfer pathogens to your face, gown ties, or mask during the rest of the doffing sequence.
"The resident doesn't have an infection because they don't have a fever."
(Hint: Why is this statement incorrect?)
What is a person can have an infection without having a fever?
Rationale: A fever is only one possible sign of infection. A resident may show other changes such as weakness, confusion, loss of appetite, coughing, changes in elimination, or changes in behavior. CNAs need to recognize changes from the resident's normal condition and report them rather than trying to diagnose.
Three links where a person could intervene and break the chain of infection.
What is:
While alcohol-based rubs are standard for hand hygiene, a healthcare worker must use soap and water after caring for a resident with this highly contagious spore-forming bacterium, as sanitizers cannot penetrate its protective shell.
What is Clostridioides difficile? (Acceptable: C. diff or C. difficile)
During removal, the outside of a contaminated glove accidentally touches a CNA's bare skin, requiring this immediate realization and action.
What is the hand is now contaminated and requires immediate hand hygiene?
To properly break the chain of infection, an alcohol-based hand rub must be rubbed continuously over all surfaces of the hands until this physical state is reached.
What is completely dry?
Rationale: Alcohol-based rubs rely on the evaporation process to effectively kill microbes. Wiping hands dry on a towel or putting gloves on while hands are still wet neutralizes the antiseptic effect and leaves pathogens alive on the skin.