WELLINGTON, New Zealand — New Zealand is buying an extra 250,000 doses of the Pfizer vaccine from Spain as it tries to keep a surge in vaccination rates going during an outbreak of the coronavirus in Auckland.

Prime Minister Jacinda Ardern says the doses will arrive Friday and she has also got a second, larger deal in the works with another country.

New Zealand was slow to get its vaccination rollout going but has been catching up to other developed since the outbreak of the delta variant began last month. About 55% of New Zealanders have received at least one dose.

New daily community cases have been decreasing and were down to 13 Thursday. Auckland remains in a strict lockdown and health authorities try to extinguish the outbreak entirely.