Nurs 200 - Exam 2 - Chapter 27: Asepsis and Infection Control

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This answer is correct because transmission of diseases can occur through direct contact, such as touching an infected person or their bodily fluids. It can also happen through blood, for example, if someone comes into contact with infected blood through a needlestick injury or transfusion. Indirect contact refers to transmission through contaminated objects or surfaces, such as touching a doorknob or sharing utensils. Waterborne diseases can be transmitted through contaminated water sources. Therefore, all the mentioned modes of transmission are valid.

Nonhuman carriers that transmit organisms from one host to another are known as vectors. Vectors can be living organisms such as mosquitoes, ticks, or fleas, or they can be inanimate objects like contaminated needles or surgical instruments. These vectors play a crucial role in the spread of diseases, as they can carry pathogens and transfer them to susceptible individuals. By understanding the role of vectors in disease transmission, scientists and healthcare professionals can develop strategies to control and prevent the spread of infectious diseases.

Lice or mosquitos can act as vectors, which means they can transmit diseases from one host to another. Vectors are organisms that carry and transmit pathogens, such as bacteria or viruses, without being affected by the disease themselves. In the case of lice and mosquitos, they can transmit diseases like malaria, dengue fever, or typhus. Therefore, the correct answer is "Vector."

Healthcare-associated infections are infections that patients acquire while receiving treatment for another condition in a healthcare setting. These infections can be caused by various microorganisms such as bacteria, viruses, fungi, and parasites. However, bacteria are the most common cause of healthcare-associated infections. They can be transmitted through contaminated hands, medical equipment, or surfaces, and can cause a wide range of infections including urinary tract infections, surgical site infections, and bloodstream infections. Effective infection prevention and control measures, such as hand hygiene and proper sterilization of equipment, are crucial in reducing the spread of bacteria in healthcare settings.

Droplet transmission refers to the spread of infectious respiratory droplets that are larger in size and tend to fall to the ground or surfaces within a short distance from the source. Airborne transmission, on the other hand, refers to the spread of smaller particles that can remain suspended in the air for longer periods and travel greater distances. The given answer of "5" indicates that droplet transmission involves droplets that are larger than 5 micrometers (um) in size.

The correct answer is "Same as". This means that the entry route is usually the same as the exit route. It implies that the way in which someone enters a place or situation is typically the same way they will exit from it.

When nurses have a heavy patient load they often do not feel that they have the time to thoroughly wash their hands (p. 721)

It is possible for a person to continually pass through the four phases of an infectious process with only one infectious exposure. This means that the person can go through the stages of exposure, incubation, illness, and recovery multiple times due to the same initial exposure. This can happen in cases where the person's immune system is not able to fully eliminate the infectious agent, leading to recurring bouts of illness.

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Infection is a disease state that occurs when pathogens are present in the body. It is a cyclic process that involves six components, which are not specified in the question. Infection can be caused by various types of pathogens such as bacteria, viruses, fungi, or parasites. These pathogens invade the body and cause damage to the tissues, leading to the development of symptoms and signs of illness. Treatment for infection usually involves the use of antimicrobial medications to eliminate the pathogens and restore health.

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Double gloving is recommended if the healthcare worker is going to be exposed to blood or body fluids. This is because blood and body fluids can potentially contain infectious agents such as viruses, bacteria, or other pathogens. Double gloving provides an extra layer of protection, reducing the risk of contamination and transmission of these pathogens. It is an important precautionary measure to ensure the safety of healthcare workers and prevent the spread of infections in healthcare settings.

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The muscular system is not a common portal of exit or escape route in humans. The respiratory tract, gastrointestinal tract, genitourinary tract, and breaks in the skin are all common pathways through which pathogens can exit the body. However, the muscular system is not directly connected to the external environment and does not serve as a route for pathogens to escape the body.

A reservoir is a source or location where microorganisms can grow and multiply. It can be a natural habitat such as humans, animals, soil, food, water, milk, or even inanimate objects. These reservoirs provide the necessary conditions and resources for the microorganisms to thrive and reproduce.

Bacteria are the most significant and commonly observed infection-causing agents in healthcare institutions. They are single-celled microorganisms that can cause various infections such as urinary tract infections, pneumonia, and surgical site infections. Bacteria can easily spread in healthcare settings due to close contact between patients and healthcare workers, contaminated surfaces, and improper hand hygiene. Therefore, controlling and preventing bacterial infections is crucial in healthcare institutions to ensure patient safety and reduce the risk of healthcare-associated infections.

Virulence refers to the ability of an organism to cause disease. It is a measure of the severity of the disease that the organism can cause. Organisms with high virulence are more likely to cause severe illness or death, while those with low virulence may cause mild or no symptoms. Therefore, the correct answer is "virulence" because it directly relates to the ability of an organism to cause disease.

Gram-positive bacteria are stained purple because they have thick cell walls that resist decolourization. The Gram staining technique involves the use of crystal violet dye, iodine, alcohol, and safranin. When the crystal violet dye is applied to the bacteria, it gets trapped in the thick peptidoglycan layer of the cell wall in Gram-positive bacteria. The iodine acts as a mordant and forms a complex with the crystal violet, making it difficult to wash away. The alcohol is used to decolorize the bacteria, but the thick cell wall of Gram-positive bacteria prevents the dye from being washed out, resulting in the bacteria retaining the purple color.

The correct answer is "aerobic" because most bacteria require oxygen to survive and carry out their metabolic processes. These bacteria are known as aerobic bacteria. They use oxygen as a final electron acceptor in their respiration process, allowing them to generate energy efficiently. However, it is important to note that there are also some bacteria that can survive in the absence of oxygen, known as anaerobic bacteria. These bacteria have adapted to environments with low or no oxygen availability and use alternative electron acceptors for respiration.

A disease-producing microorganism is commonly known as a pathogen or pathogens. Pathogens are organisms such as bacteria, viruses, fungi, or parasites that can cause diseases in humans, animals, or plants. They invade the host's body and multiply, leading to the development of various illnesses. Pathogens can be transmitted through various means, including direct contact, airborne droplets, contaminated food or water, or through vectors like mosquitoes or ticks. Understanding pathogens and their modes of transmission is crucial in preventing and controlling the spread of diseases.

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Fungi are present in all of the above (soil, air, and water) because they are highly adaptable organisms that can thrive in various environments. Fungi play important roles in decomposing organic matter in soil, aiding in nutrient cycling. They can also be found in the air as spores, which are tiny reproductive structures that can travel through the air. Additionally, certain types of fungi can live in water, such as aquatic fungi that decompose organic material in aquatic ecosystems. Therefore, fungi can be found in all three mentioned environments.

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Not all nosocomial infections are iatrogenic (p. 720)

The correct progression of an infection phases starts with the incubation period, during which the pathogen is multiplying in the body but symptoms are not yet present. This is followed by the prodromal stage, where initial symptoms start to appear. The full stage of illness comes next, characterized by the peak of symptoms and the highest level of pathogen activity. Finally, the convalescent period occurs, during which the body begins to recover and symptoms gradually subside.

Viruses are the smallest microorganisms that can only be seen with an electron microscope. They are much smaller than bacteria and other microorganisms. Viruses are not considered living organisms as they cannot reproduce or carry out metabolic activities on their own. They are composed of genetic material, either DNA or RNA, surrounded by a protein coat. Viruses require a host cell to replicate and cause infections in animals, plants, and even bacteria. Due to their small size and unique characteristics, viruses are a distinct category of microorganisms.

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The prodromal stage of infection is the initial stage where the person starts to experience non-specific symptoms such as fatigue, fever, and headache. This stage occurs before the specific symptoms of the infection develop. During this stage, the person is most infectious as the virus or bacteria is multiplying rapidly in their body and can easily be transmitted to others through respiratory droplets or direct contact. Therefore, the person is most contagious during the prodromal stage of infection.

All of the above options, N95, High-efficiency particulate air mask, and HEPA mask, filter inspired air in addition to filtering expired air. These masks are designed to provide a high level of filtration and protection against airborne particles and contaminants. They effectively filter both incoming and outgoing air, ensuring that the wearer is protected from inhaling harmful substances and also prevents the spread of any exhaled particles. Therefore, all three options mentioned are correct in terms of filtering both inspired and expired air.

Antigens and antibodies are part of the body's immune response. This response is the body's defense mechanism against foreign substances, such as pathogens or toxins. Antigens are molecules that can trigger an immune response, while antibodies are proteins produced by the immune system to neutralize or destroy these antigens. Together, they play a crucial role in protecting the body from infections and diseases by recognizing and eliminating harmful invaders.

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Mold is not used to categorize bacteria because mold is not a type of bacteria. Mold is a type of fungus, and bacteria and fungi are two distinct groups of microorganisms. Bacteria are classified based on various characteristics such as shape, arrangement, and staining properties, which are represented by the options Cocci, Spirochete, Gram positive, and Bacilli. Mold, on the other hand, belongs to the fungal kingdom and is categorized separately from bacteria.

The second component of the infection cycle is the reservoir. A reservoir refers to the place where the infectious agent lives, grows, and multiplies. It can be a human, animal, or environmental source that harbors the pathogen and allows it to survive. The reservoir is important because it provides a continuous supply of the infectious agent, allowing it to spread and cause disease. Identifying and controlling the reservoir is crucial in preventing the transmission of infections.

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Carriers are individuals who harbor an infectious agent in their body but do not show any symptoms or manifestations of the disease. They can unknowingly spread the infection to others through various means such as respiratory droplets, bodily fluids, or contaminated surfaces. Carriers can play a significant role in the transmission of infectious diseases, as they may remain undetected and continue to spread the infection to others. Identifying carriers and implementing appropriate preventive measures can help in controlling the spread of the disease.

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Surgical asepsis does involve actions such as handwashing. Handwashing is an essential component of surgical asepsis as it helps to remove microorganisms from the hands and prevent their transmission to the patient or surgical field.

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When an organism becomes attached to dust particles, it is considered an airborne route. This means that the organism is able to travel through the air by attaching itself to dust particles, allowing it to be transported over long distances. This can increase the likelihood of the organism spreading to other areas and infecting new hosts.