There are 116 people infected on the island - 36 imported and 80 local cases.
Nine new cases have been found in Butaritari Island, prompting the government to advise local authorities to enforce a lockdown.
Several other islands have been placed under strict restrictions - including South Tarawa, Betio, and Buota - to stop the virus from spiralling out of control.
Meanwhile, the government said that from today, fishermen in South Tarawa and Betio would only be allowed to go fishing between 6am and 2pm.