The portal of entry of the virus responsible for chickenpox is through the?

UPRVUNL - 2021

Microbiology

Easy

Appeared in: UPRVUNL - 2021

Explanation

The Varicella-Zoster Virus (VZV), which causes chickenpox, is primarily transmitted via respiratory droplets.
The virus enters the body by infecting the mucosa of the upper respiratory tract.
After initial replication in the respiratory tract and regional lymph nodes, the virus spreads through the bloodstream (viremia) to cause systemic infection and the characteristic skin rash.
This mode of entry makes the respiratory tract the correct portal.

Option A: The GI tract is not the portal of entry because the Varicella-Zoster Virus is sensitive to stomach acid and bile, which would inactivate it.
Option B: Parenteral transmission (e.g., via injection or blood transfusion) is not the primary or natural route of acquiring chickenpox in the community.
Option D: The alimentary canal is another term for the GI tract. As with the GI tract, the chickenpox virus cannot survive this route due to digestive acids and enzymes.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Portal of entry for Varicella-Zoster Virus (Chickenpox) as background academic context rather than a clinical decision trigger.
Understanding that chickenpox enters through the respiratory tract is fundamental to implementing correct isolation procedures (Airborne Precautions) to prevent nosocomial (hospital-acquired) spread.
Nurses must educate patients and families that the contagious period begins before the rash is visible, reinforcing the importance of avoiding contact with susceptible individuals (e.g., pregnant women, immunocompromised) if exposure is suspected.
What if the patient is an adult who has never had chickenpox? The disease is typically more severe in adults, with a higher risk of complications like varicella pneumonia, which directly relates to the virus's affinity for the respiratory system.

How to Approach the Question

First, identify the core of the question: it asks for the 'portal of entry' for the 'chickenpox virus' (Varicella-Zoster).
Recall the common modes of transmission for childhood viral illnesses. Think about how diseases like measles, mumps, and chickenpox spread.
Recognize that chickenpox is known to be highly contagious and spreads easily through the air, especially in settings like schools or daycare centers. This points towards an airborne or droplet transmission route.
Evaluate the options: 'GI tract' and 'Alimentary canal' refer to the digestive system, which is incorrect for VZV. 'Parenteral' refers to injection/blood, which is not the primary route.
Conclude that the 'Respiratory tract' is the only option consistent with airborne/droplet transmission.
Therefore, select the option that aligns with the known transmission mechanism of the virus.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 2 p. 218-220

E6 Medicine Harrison 22e Part 1 p. 1573-1575

E6 Nursing Fundamentals Taylor p. 165-167