SAO PAULO (AP) — Brazil's Health Ministry says its yellow fever vaccination campaign is significantly short of its goal and that 10 million people still need to be immunized.

In January, the ministry launched a campaign to vaccinate more than 23 million people in three states affected by the largest outbreak of the mosquito-borne disease in decades. The ministry had previously said that the campaign had reached 76 percent of the targeted population.

But on Thursday, it significantly revised down that figure. It said that Bahia state had reached a 55 percent vaccination rate, Sao Paulo a 52 percent rate and Rio de Janeiro just 41 percent. The ministry did immediately respond to a request to explain the revision.

In the current outbreak, 1,127 people have been infected. Of those, 331 have died.