Scientists have discovered over a dozen parasitic worms in the eyes of a black bear in rural Pennsylvania, raising concerns about the potential danger to humans. The worms, which cause Thelaziosis, have previously been found in pets in the U.S. This marks the first time they have been observed in a wild animal in the country. The worms are transmitted by infected flies that feed on tears, potentially leading to ulcers and even blindness in serious cases.
The researchers believe that wildlife, including black bears, could act as a reservoir for the parasite and increase the risk of transmission to humans and domestic animals. The broad range of land inhabited by black bears and their interactions with humans and pets make scientists worried about the potential spread of the worm. The worms may also pose a threat to endangered and threatened species.
While cases of the worm have been reported in pets in the U.S., experts believe the parasite is emerging in North America. The first known case in the U.S. was identified in a Labrador retriever in 2018. Unlike in Asia and Europe, where cases have been reported in humans, the worms in North America have remained limited to animals’ eyes.
People are advised to monitor their pets for signs of disease around their eyes and seek veterinary care if needed. While the worms can cause blindness in severe cases, they are limited to the eyes and are not fatal. Pet owners should stay vigilant to prevent the potential transmission of the parasite.
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