If a disease is eradicated from the world this indicates the following:

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Question restatement: If a disease is eradicated from the world this indicates the following:

Option a: 'The disease still exists in the world and a vaccine is crucial for infants and the elderly.' This suggests ongoing global presence of the disease, which contradicts eradication. If eradication had occurred, there would be no circulating disease to protect against, so emphasizing ongoing presence is inaccurate.

Option b: 'The disease no longer exists in the world but a vaccine is still required in many regions.' While it correctly notes global absence, the claim that a vaccine is still required in many regions implies a continued presence or risk, which does not align with true eradication where transmission has been eliminated globally. In eradication, vaccination is typically no longer routine for disease control because there is no circulating pathogen to prevent.

Option c: 'The disease still exists in the world and a vaccine may be required for protection.' This mixes the idea of ongoing existence with vaccination for protection, which contradicts the concept of eradication where transmission has ceased. If the disease were still present, eradication would not have been achieved, and vaccination policies would reflect ongoing transmission dynamics.

Option d: 'The disease no longer exists in the world and a vaccine is therefore no longer required for protection.' This aligns with the definition of eradication: the pathogen no longer exists anywhere, so there is no need for ongoing vaccination to prevent exposure. The absence of circulating disease means protection through vaccination is no longer necessary for public health purposes.

Throughout the analysis, notice how each option either implies ongoing disease transmission or contradicts the core idea of global, permanent elimination. The correct interpretation of eradication is a complete absence of the pathogen worldwide, which ends the requirement for continued vaccination against that disease. Stay alert to the logical implication: if eradicated, there is no disease to guard against, so vaccination programs tied to that disease are typically discontinued unless reintroduction occurs. Keeping this distinction clear helps prevent conflating elimination (regional) with eradication (global).

In summary, each incorrect option either maintains a false sense of ongoing global circulation (a, c) or suggests that vaccination is still needed despite global absence (b), whereas the idea of complete global absence with no ongoing vaccination need matches option d.

2025-PSB-MIC1IPE(SP-T3-FT) - INFECTIONS, PANDEMICS AND EPIDEMICS

If a disease is eradicated from the world this indicates the following:

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