Which factor contributes to the (re)emergence of communicable diseases?

Question

BlackTom AI · Accepted Answer

Multiple interacting factors drive the (re)emergence of communicable diseases. Key concepts include pathogen evolution, human behavior and movement, and environmental change—each of which can increase opportunities for pathogens to spread, adapt, or jump species.

1) Relevant knowledge points and concepts:
- Microbial adaptation and change: Pathogens mutate, undergo genetic recombination, or acquire resistance, enabling them to evade immunity or treatments (e.g., influenza antigenic shift, antibiotic-resistant bacteria).
- International travel and global commerce: Rapid, long-distance movement of people, animals, and goods facilitates global seeding of outbreaks (e.g., SARS, COVID-19, and the rapid spread of foodborne pathogens through trade).
- Climate change and changing ecosystems: Warmer temperatures, altered rainfall, and habitat disruption expand vector ranges (mosquitoes, ticks), alter host–pathogen dynamics, and increase zoonotic spillover risk (e.g., expansion of dengue, chikungunya, and Lyme disease).

2) Step-by-step reasoning:
- Evaluate option “Microbial adaptation and change”: Established driver—pathogen evolution increases emergence potential. Include concrete examples (antibiotic resistance; influenza reassortment).
- Evaluate option “International travel and global commerce”: Established driver—modern travel networks transmit pathogens between regions before detection.
- Evaluate option “Climate change and changing ecosystems”: Established driver—environmental shifts change vector distribution and animal host interactions.
- Since each listed factor independently contributes to emergence, the comprehensive option that includes them all must be correct.

3) Intermediate steps (conceptual synthesis): Combine evidence that (a) pathogens evolve, (b) humans move and trade globally, and (c) environments are changing—these together raise emergence risk.

4) Why the correct answer is correct: The choice “All of the listed answers contribute to the (re)emergence of communicable diseases” accurately reflects that emergence is multifactorial; no single listed factor alone accounts for all observed increases.

5) Why other options are incomplete: Each single-factor option is true but partial; selecting only one ignores additional important drivers.

Conclusion: Therefore, the correct answer is “All of the listed answers contribute to the (re)emergence of communicable diseases,” which matches the provided answer.

Which factor contributes to the (re)emergence of communicable diseases?单项选择题

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