Infection and Its Transmission
Q1. What are the common bacterial infections and their modes of transmission?
Ans: Here is a list of some common bacterial infections along with how they are typically transmitted:
Tuberculosis (TB)
Causative agent: Mycobacterium tuberculosis
Mode of transmission: Airborne droplets from coughs or sneezes of an infected person.
Strep Throat
Causative agent: Streptococcus pyogenes (Group A Streptococcus)
Mode of transmission: Respiratory droplets, direct contact with infected saliva or nasal secretions.
Cholera
Causative agent: Vibrio cholerae
Mode of transmission: Contaminated water or food.
Typhoid Fever
Causative agent: Salmonella typhi
Mode of transmission: Ingestion of contaminated food or water.
Pneumonia (bacterial types)
Causative agents: Streptococcus pneumoniae, Haemophilus influenzae, others Mode of transmission: Respiratory droplets.
Urinary Tract Infection (UTI)
Causative agents: Escherichia coli (most common)
Mode of transmission: Usually endogenous (from own intestinal flora), sometimes via catheter or sexual contact.
Gonorrhea
Causative agent: Neisseria gonorrhoeae
Mode of transmission: Sexual contact.
Syphilis
Causative agent: Treponema pallidum
Mode of transmission: Sexual contact, from mother to fetus (congenital).
Bacterial Meningitis
Causative agents: Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae
Mode of transmission: Respiratory droplets or close contact.
Food Poisoning (e.g., Salmonellosis)
Causative agents: Salmonella species, Clostridium perfringens, Staphylococcus aureus
Mode of transmission: Contaminated food or water.
Ans : Definition of Nosocomial Infection
A nosocomial infection, also known as a hospital-acquired infection (HAI), is an infection that a patient acquires while receiving treatment in a hospital or healthcare facility, which was not present or incubating at the time of admission.
Role of a Nurse in Prevention of Hospital-Acquired Infection
Nurses play a critical role in preventing nosocomial infections through the following actions:
- Hand Hygiene: Regular and thorough hand washing or use of alcohol-based hand sanitizers before and after patient contact.
- Use of Personal Protective Equipment (PPE): Proper use of gloves, masks, gowns, and eye protection to prevent transmission of pathogens.
- Aseptic Techniques: Maintaining sterile procedures during invasive procedures such as catheter insertion, injections, and wound care.
- Environmental Cleanliness: Ensuring that patient surroundings and medical equipment are clean and disinfected.
- Patient Education: Teaching patients and their families about infection prevention practices.
- Monitoring and Reporting: Observing signs of infection and promptly reporting any suspected infections to the healthcare team.
- Proper Waste Disposal: Safe disposal of medical waste and sharps to prevent contamination.
- Isolation Precautions: Implementing isolation protocols for patients with contagious infections.
By adhering to these practices, nurses help reduce the risk of infections, protect patients, and improve overall healthcare outcomes.
Long Questions (5–10 Marks)
1. Define infection. Explain the chain of infection in detail.
2. Define nosocomial infection. Describe the role of a nurse in prevention of hospital-acquired infection.
3. Define sterilization. Explain different methods of sterilization.
4. Explain the sources and modes of transmission of infection.
5. Define immunity. Describe types of immunity with examples.
6. Explain airborne transmission and droplet infection with examples.
7. Describe universal precautions used in hospitals.
8. Explain biomedical waste management in infection control.
9. Discuss the prevention and control of communicable diseases.
10. Define disinfection. Differentiate between sterilization and disinfection.
11. Explain autoclaving method of sterilization.
12. Describe the role of nurses in controlling cross infection.
13. Explain hand washing technique and its importance in infection prevention.
14. Define asepsis. Explain medical and surgical asepsis.
15. Discuss factors influencing spread of infection.
Short Notes (3–5 Marks)
1. Fomites
2. Cross infection
3. Reservoir of infection
4. Portal of entry and portal of exit
5. Vector-borne diseases
6. Isolation techniques
7. Personal protective equipment (PPE)
8. Antiseptics and disinfectants
9. Carrier of disease
10. Chain of infection
11. Opportunistic infection
12. Droplet infection
13. Airborne infection
14. Standard precautions
15. Incubation period
16. Vaccination
17. Medical asepsis
18. Surgical asepsis
19. Hospital-acquired infection
20. Hand hygiene
Very Short Questions
1. What is infection?
2. Define pathogen.
3. What is contamination?
4. Define immunity.
5. What is sterilization?
6. What is disinfection?
7. Name two methods of sterilization.
8. What is autoclave?
9. Define carrier.
10. What is nosocomial infection?
11. Expand PPE.
12. What is vector transmission?
13. Name two communicable diseases.
14. What is quarantine?
15. Define isolation.
16. What is medical asepsis?
17. What is surgical asepsis?
18. Name one chemical disinfectant.
19. What is hand hygiene?
20. Define cross infection.
MCQs (Previous Year Type)
1. Hospital acquired infection is called:
a) Droplet infection
b) Opportunistic infection
c) Nosocomial infection
d) Airborne infection
Ans: c) Nosocomial infection
2. Objects capable of transmitting disease are called:
a) Pathogens
b) Fomites
c) Spores
d) Parasites
Ans: b) Fomites
3. Rabies is caused by:
a) Snake bite
b) Rat bite
c) Dog bite
d) Mosquito bite
Ans: c) Dog bite
4. Cholera spreads mainly through:
a) Air
b) Water and food
c) Skin contact
d) Blood
Ans: b) Water and food
5. The best method of preventing infection is:
a) Isolation
b) Hand washing
c) Vaccination
d) Antibiotics
Ans: b) Hand washing
6. Sterilization by moist heat is done using:
a) Hot air oven
b) Autoclave
c) Incinerator
d) UV rays
Ans: b) Autoclave
7. Infection transmitted by mosquitoes is called:
a) Airborne infection
b) Contact infection
c) Vector-borne infection
d) Droplet infection
Ans: c) Vector-borne infection
8. The process of destroying all microorganisms is called:
a) Cleaning
b) Disinfection
c) Sterilization
d) Antisepsis
Ans: c) Sterilization
important Repeated Questions for Exam
* Define infection and explain chain of infection.
* Explain sources and modes of transmission of infection.
* Write nurse’s role in prevention of nosocomial infection.
* Differentiate sterilization and disinfection.
* Explain hand washing procedure.
* Describe medical and surgical asepsis.
* Explain universal precautions.
* Write short note on cross infection.
