National anthrax task force spokesman Nicholas Kauta says the outbreak began in Queen Elizabeth National Park in June and has also killed nine buffalo.
He said Thursday that no humans are known to have contracted the deadly disease during the outbreak and that tourism has been unaffected.
Anthrax also killed 300 hippos in 2004. Anthrax spores can occur naturally in soil and can remain dormant for years.
Drought, floods or wind expose the spores and they can be ingested when livestock graze close to the ground. Vaccines can protect livestock.