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Animals’ Deadliest Diseases Killing Humans in 2023

Erlina Fury Santika 11/05/2026 18:15 WIB

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According to Our World in Data, there are a number of diseases from animals that are the most deadly to humans in 2023. The highest, over the centuries, are still caused by mosquitoes.

Estimation of the Number of Human Deaths Caused by the 10 Most Deadly Animal-borne Diseases in the World (2023)

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Estimation of the Number of Human Deaths Caused by the 10 Most Deadly Animal-borne Diseases in the World (2023)

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A report compiled by Our World in Data reveals that several animal-related diseases are among the leading causes of human deaths worldwide in 2023.

Mosquitoes are the deadliest animals, with an estimated 760,000 human deaths per year.

Our World in Data finds that more than 80% of these deaths are caused by malaria, which is transmitted by the Anopheles mosquito. Malaria alone still kills nearly half a million children each year.

An estimated 100,000 additional deaths are caused by mosquito-borne diseases such as those transmitted by Aedes aegypti mosquitoes—the main vector of dengue fever—as well as Japanese encephalitis.

Next are venomous snakes, with an estimated 100,000 deaths per year. However, researchers note that these figures remain uncertain due to underreporting in rural areas where many cases are not well documented.

This is followed by dog-related zoonotic diseases, which account for approximately 40,000 deaths per year.

“Dogs are animals that are very close to humans as pets. Most of these deaths are caused by rabies rather than direct injuries,” Our World in Data noted on its website.

Here are the estimated number of human deaths caused by the top 10 animal-related diseases in 2023:

Mosquitoes: 760,000 deaths per year
Snakes: 100,000 deaths per year
Dogs: 40,000 deaths per year
Freshwater snails: 14,000 deaths per year
Kissing bugs: 8,000 deaths per year
Sandflies: 5,000 deaths per year
Roundworms: 4,000 deaths per year
Scorpions: 3,000 deaths per year
Tapeworms: 2,000 deaths per year
Tsetse flies: 1,500 deaths per year

Our World in Data also notes that most deaths caused by animals—especially the largest killers—are preventable. Public health interventions such as insecticides, medications, and vaccines already exist to reduce the risk of zoonotic transmission.

However, the main challenge is that not everyone has access to these prevention and treatment methods when needed.

“If these ‘small killers’ received the same global attention as large predators, efforts to combat them might become much more serious,” Our World in Data stated.

Editor : Erlina Fury Santika

"Disclosure: This is an AI-generated translation of the original article. We strive for accuracy, but please note that automated translations may contain errors or slight inconsistencies."

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Animals’ Deadliest Diseases Killing Humans in 2023

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