In Uruguay, accidents caused by venomous animals are no small issue. The corner spider has become the most common species of bite in homes. Its presence behind furniture, paintings, or even inside shoes poses a real risk to you and your family.
Throughout 2025, the Ministry of Public Health (MSP) recorded 37 cases of snake and spider bites, according to its epidemiological bulletin. These data confirm that the country faces a growing health challenge .
The corner spider: the most dangerous in homes
The corner spider (Loxosceles laeta) is small, brown, and difficult to spot. Its danger lies in the fact that it tends to hide in dark, quiet places: behind furniture, paintings, or inside clothing and shoes. When someone accidentally presses it, it responds with a bite that can be serious.
The venom of this species causes significant skin lesions and, in some cases, systemic complications. Children are especially vulnerable to its effects.
Other poisonous spiders in Uruguay
Biologist Fernando Pérez Miles , from the Faculty of Sciences, explained that in addition to the corner spider, there are other dangerous species in Uruguay:
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The black widow spider : usually found in rural areas and open fields. Its venom is neurotoxic.
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The banana spider : It usually arrives in boxes of imported fruit. It is also neurotoxic.
Although bites from these species are less frequent, they can cause serious clinical symptoms.
Recent accident data
The MSP 37 cases as of August 2, 2025 :
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15 spider bites.
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22 snake bites.
Between 2020 and 2022, the average was lower: 45 spider bites and 143 snake bites over three years. This shows a worrying upward trend.
What to do in case of a spider bite
If you suffer a bite from a corner spider or any other dangerous species, specialists recommend:
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Do not apply home remedies such as mud, kerosene, or cuts on the skin.
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Do not suck the wound.
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If possible, capture the spider in a jar to facilitate diagnosis.
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Go to a health center immediately.
Rapid diagnosis is key for doctors to administer the correct treatment, which may include specific serums.
Poisonous snakes in Uruguay
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Cruise
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Children
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Bell
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Coral
Yaras and cruceras are responsible for most accidents. While yaras inhabit mountain ranges and ridges, cruceras are found in low-lying areas such as marshes and wetlands.
A recent fatal case
In February 2025, a 66-year-old woman died in La Barra, Maldonado , after being bitten by a venomous snake. Her partner tried to take her by van to San Carlos, but died on the way.
These types of cases are rare in Uruguay: in the last 40 years, only two confirmed deaths from snakebites before this incident.
How to act in case of snake bites
Expert Raúl Maneyro , from the Faculty of Sciences, recommends:
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Do not cut or suck the wound.
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Do not apply mud or chemicals.
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Wash with clean water and keep the wound free of contaminants.
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Take the victim to a hospital immediately.
Antivenin serum , available in hospitals throughout the country and administered intravenously, is used in health centers
Prevention at home and in the field
Prevention is the best defense against spider and snake bites. Some practical recommendations:
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Inspect and shake out clothing and shoes before wearing them.
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Keep the corners of the house clean and clear.
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Wear gloves when gardening.
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Avoid walking barefoot in rural areas.
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Consult a doctor immediately if you experience any suspicious bite.
