NVS Staff Nurse - 2019
Community Health Nursing
Easy
The ideal storage temperature for a polio vaccine is?
Appeared in: NVS Staff Nurse - 2019
Explanation
- The ideal long-term storage temperature for the Oral Polio Vaccine (OPV), which is highly heat-sensitive, is -20°C.
- This temperature is maintained in deep freezers at district and regional health facilities to ensure the vaccine remains potent for extended periods.
- The acceptable storage range for OPV is -15°C to -25°C, and -20°C is the ideal target within this range.
- The question's sub-zero temperature options specifically point to OPV, as the Inactivated Polio Vaccine (IPV) is freeze-sensitive and stored at +2°C to +8°C.
Why Other Options Were Wrong
- Option A: This temperature is not cold enough for the long-term storage of the highly heat-sensitive OPV, which would lead to a loss of potency. It falls outside the recommended -15°C to -25°C range.
- Option C: While -15°C is the minimum acceptable temperature for long-term OPV storage, it is not considered the ideal temperature. The ideal target is -20°C to ensure maximum stability and shelf life.
- Option D: This temperature is insufficient for the long-term storage of OPV. It is warmer than the recommended range of -15°C to -25°C and would result in a rapid decline in the vaccine's effectiveness.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Vaccine storage and cold chain management, specifically for the polio vaccine as background academic context rather than a clinical decision trigger.
- Maintaining the cold chain is a critical nursing responsibility. A breach can lead to administering ineffective vaccines, causing failed immunizations and potential outbreaks of preventable diseases.
- Nurses must check and record freezer and refrigerator temperatures at least twice daily and be prepared with a contingency plan for power failures.
- The Vaccine Vial Monitor (VVM) on OPV vials is a key tool for nurses to visually check if a vaccine is safe to use after potential heat exposure.
How to Approach the Question
- First, identify the key terms in the question: 'ideal storage temperature' and 'polio vaccine'.
- Recognize that 'polio vaccine' can refer to two types: Oral Polio Vaccine (OPV) and Inactivated Polio Vaccine (IPV), which have different storage requirements.
- Analyze the given options: -5°C, -20°C, -15°C, -10°C. All are sub-zero temperatures.
- Deduce that the question must be about OPV, as IPV is stored at positive temperatures (+2°C to +8°C) and would be damaged by freezing.
- Recall the specific long-term storage requirements for OPV, which is in a deep freezer at a range of -15°C to -25°C.
- From the options, select the one that represents the 'ideal' temperature within this range, which is -20°C.
Concept Tested & Keywords
- Concept Tested: Vaccine storage and cold chain management, specifically for the polio vaccine.
- Stem keywords: ideal storage temperature, polio vaccine
- Lead-in keywords: is
- Negative lead-in flag: false
Question ID
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Reference Book
E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart B (pp 202-403 of 604) p. 58-60
E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 103-105
E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 213-215
Practise the full NVS Staff Nurse - 2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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