What percentage of new and emerging diseases are zoonotic?

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BlackTom AI · Accepted Answer

First, we restate the core question to anchor our analysis: What percentage of new and emerging diseases are zoonotic?
Option 1: 50% — This underestimates the commonly cited range. In many public health sources, a higher share is attributed to zoonoses, so describing exactly half as zoonotic is not aligned with the typical consensus.
Option 2: 60% — This is closer to some estimates, but it still falls short of the widely cited figure used in global health discussions, which places a larger portion within the zoonotic category.
Option 3: 75% — This matches the standard statistic frequently cited by organizations like the WHO and in epidemiology literature, which state that roughly three-quarters of new and emerging diseases originate in animals, making this the correct conventional estimate.
Option 4: 85% — While this would indicate a very high proportion, it overstates the prevalent benchmark reported in most authoritative summaries, which generally center around the 75% figure rather than 85%.

To connect the options to the underlying concept: zoonotic diseases are those transmitted from animals to humans, and historical patterns show that many novel pathogens (e.g., HIV, certain coronaviruses, and many influenza strains) emerged from animal reservoirs. Responses in global health frequently use 75% as a representative figure to emphasize the animal-human interface in disease emergence. The other options either understate or overstate this commonly cited proportion, leading to incorrect answers in typical assessments.

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What percentage of new and emerging diseases are zoonotic?

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