Disease outbreak has occurred in northern Argentina , Brazil and Paraguay . The outbreak has killed at least 21 people . Brazil had tallied 13 deaths , the country 's Ministry of Health said . Health officials recommend that people need to go to affected to get help . Concern arose in Argentina last month after two monkeys died of yellow fever .
Disease outbreak has occurred in northern Argentina , Brazil and Paraguay . The outbreak has killed at least 21 people . Health officials recommend that people need to go to affected to get help . Concern arose in Argentina last month after two monkeys died of yellow fever .