Question
Describe any four factors that favour emergence of new diseases and zoonotic diseases.
Answer :
Word Count : 1111
The emergence of new diseases, particularly zoonotic diseases—those that transmit from animals to humans—poses a significant threat to global health, especially in the context of pandemic preparedness and response. Understanding the underlying factors that favor the emergence of such diseases is essential for designing effective public health strategies, early warning systems, and international collaboration mechanisms. Four key factors contributing to the emergence of new and zoonotic diseases are: environmental changes and deforestation, global travel and trade, climate change, and intensive agriculture and animal husbandry. 1. Environmental Changes and Deforestation One of the most prominent factors contributing to the rise of zoonotic diseases is environmental disruption, especially deforestation. As human populations expand, forests and other natural habitats are increasingly cleared for agriculture, urban development, and resource extraction. This process results in closer interactions between humans and wildlife, creating opportunities for cross-species transmission of pathogens. When forests are cleared, animals such as bats, rodents, and primates, which are common reservoirs of zoonotic viruses, are forced to migrate to new areas, often inhabited by humans. The disruption of ecosystems breaks down the natural barriers that prevent pathogens from spilling over into human populations. For example, the emergence of the Nipah virus in Malaysia in the late 1990s was linked to deforestation and habitat loss, which led fruit bats to seek food in orchards near pig farms, facilitating transmission to pigs and then to humans. Additionally, environmental degradation undermines the natural checks and balances of ecosystems. Predators that usually keep reservoir species in control may diminish, resulting in increased populations of potential carriers. This heightened human-wildlife interaction increases the likelihood of zoonotic spillover events. From a pandemic preparedness perspective, this emphasizes ____ ___ ___ _________ __________ ____ ____ ______ __________ ____ ____.
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The emergence of new diseases, particularly zoonotic diseases—those that transmit from animals to humans—poses a significant threat to global health, especially in the context of pandemic preparedness and response. Understanding the underlying factors that favor the emergence of such diseases is essential for designing effective public health strategies, early warning systems, and international collaboration mechanisms. Four key factors contributing to the emergence of new and zoonotic diseases are: environmental changes and deforestation, global travel and trade, climate change, and intensive agriculture and animal husbandry. 1. Environmental Changes and Deforestation One of the most prominent factors contributing to the rise of zoonotic diseases is environmental disruption, especially deforestation. As human populations expand, forests and other natural habitats are increasingly cleared for agriculture, urban development, and resource extraction. This process results in closer interactions between humans and wildlife, creating opportunities for cross-species transmission of pathogens. When forests are cleared, animals such as bats, rodents, and primates, which are common reservoirs of zoonotic viruses, are forced to migrate to new areas, often inhabited by humans. The disruption of ecosystems breaks down the natural barriers that prevent pathogens from spilling over into human populations. For example, the emergence of the Nipah virus in Malaysia in the late 1990s was linked to deforestation and habitat loss, which led fruit bats to seek food in orchards near pig farms, facilitating transmission to pigs and then to humans. Additionally, environmental degradation undermines the natural checks and balances of ecosystems. Predators that usually keep reservoir species in control may diminish, resulting in increased populations of potential carriers. This heightened human-wildlife interaction increases the likelihood of zoonotic spillover events. From a pandemic preparedness perspective, this emphasizes ____ ___ ___ _________ __________ ____ ____ ______ __________ ____ ____.
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