The United States has counted 522 fatalities through August 28, and nearly 1,800 people had died worldwide through August 13, US and global health officials said.

In terms of mortality rate, which considers flu deaths in terms of a nation's population, Brazil ranks seventh, and the United States 13th, the Brazilian Ministry of Health said in a news release on Wednesday.

Argentina, which has reported 386 deaths attributed to H1N1 as of August 13, ranks first per capita, the Brazilian health officials said, and Mexico, where the flu outbreak was discovered in April, ranks 14th per capita.

Brazil, Argentina, Chile, Mexico and the United States have the most total cases globally, according to the World Health Organization.

The Brazilian Ministry of Health said there have been 6,100 cases of flu in the nation, with 5,206 cases (85.3 percent) confirmed as H1N1, also known as swine flu.

The state of Sao Paulo had 223 deaths through Wednesday, the largest number in the country. In addition, 480 pregnant women have been confirmed with H1N1, of whom 58 died. Swine flu has been shown to hit young people and pregnant women particularly hard.