Australian Redback Spider Bites Rise in Osaka, Anti-Venom Low

By Adam Le

Nov. 25 (Bloomberg) -- Redback spider bites increased to 13 in western Japan’s Osaka Prefecture this year, the most since 1995, when the poisonous arachnid was first thought to have migrated from Australia on cargo vessels.

The number of reported cases increased from nine last year, according to the prefectural government’s Web site. In June, a six-year-old boy in Osaka was given the anti-venom after being bitten, the first case of the treatment being used in Japan.

“We have low reserves of the anti-venom,” Takashi Kuramochi, a spokesman for the prefecture’s Environmental Hygiene Department, said today by telephone. “I don’t know why the number of redback bites is up.”

The redback, common in Australia and related to the black widow, delivers a bite that can cause severe pain and possibly death, according to the Australia Museum’s Web site. No deaths from the spider’s bite have been reported after Australia introduced anti-venom, the Web site says.

Called “Seakagoke-gumo” in Japanese, the spider was first found in 1995 in Takaishi in southern Osaka. It has since been sighted in 16 of Japan’s 47 prefectures, the Asahi newspaper reported, citing the country’s environment ministry.

No deaths from bites by redbacks, so named because of the red stripe on their abdomen, have been reported in Japan. Females of the species have bodies up to 1 centimeter in length, while males are usually 3 or 4 millimeters long.


  1. Love this blog seeing what wildlife there is in another country.

  2. You have a genuine capacity to compose a substance that is useful for us. You have shared an amazing post about Termite Treatment Adelaide.Much obliged to you for your endeavors in sharing such information with us.