U.S. health officials Tuesday laid out worst-case and best-case scenarios for the Ebola epidemic in West Africa, warning that the number of infected people could explode to at least 1.4 million by mid-January — or peak well below that, if efforts to control the outbreak are ramped up.

The widely varying projections by the Centers for Disease Control and Prevention were based on conditions in late August and do not take into account a recent international surge in medical aid for the stricken region. That burst has given health authorities reason for some optimism.

Three more people have died from Legionnaire's disease in Catalonia in northeastern Spain, officials said Tuesday, bringing to seven the death toll from the lung infection in the region in just over a week.

The three deaths took place in Ripollet, a town near Barcelona, Catalonia's health department said.

A simple breath test may one day show whether someone has a strain of tuberculosis that will respond to a frontline antibiotic, or a drug-resistant type, scientists said Tuesday.

Building on previous work for a fast-track breath test, their new prototype technique looks for traces of nitrogen gas emitted by the disease-causing germ Mycobacterium tuberculosis.

U.S. soft-drinks giants Tuesday promised to work to reduce the country's beverage calorie consumption by 20 percent by 2025 in a campaign to counter obesity trends.

Coca-Cola, PepsiCo and Dr. Pepper Snapple pledged to provide smaller-sized bottles, and more water and other low- or no-calorie beverages, to the market to help bring down per-person consumption of their high-sugar drinks.

Fewer than a quarter of U.S. children prescribed medication for attention deficit hyperactivity disorder (ADHD) get the recommended behavioral therapy along with it, said a study out Monday.

The findings in the Journal of the American Medical Association (JAMA) Pediatrics examined records of more than 300,000 children from 1,516 counties across the United States who had received an ADHD prescription.

The number of Ebola infections will triple to 20,000 by November, soaring by the thousands every week if efforts are not significantly stepped up to stop the outbreak, the WHO warned Tuesday.

"Without drastic improvements in control measures, the numbers of cases of and deaths from Ebola are expected to continue increasing from hundreds to thousands per week in the coming months," the World Health Organization said in a study.

To Ghana's legions of jobless young men, Eric Bimpong has a money-making proposition: sell your blood.

Bimpong spends his days outside schools, bars and on the streets of poor neighborhoods in Accra, scouring for teenagers and 20-somethings to give blood outside the capital's largest hospital.

Asian Games organizers prevented a potential mass outbreak of food poisoning after salmonella was detected in lunch boxes prepared for athletes, officials said on Monday.

The bacteria was found Sunday in meat included on boxed meals provided by a food caterer.

Millions of Sierra Leoneans were set to emerge from their homes on Monday after a three-day nationwide lockdown during which scores of dead bodies and new cases of Ebola infections were uncovered.

The west African country had imposed the extreme measure confining its six million people to their homes for 72 hours in a bid to stem a deadly Ebola outbreak which has claimed more than 2,600 lives there and in neighboring Liberia and Guinea this year.

Pope Francis has called for more people to donate their organs in a bid to stop illegal trafficking, but spoke out against the legalization of the organ market, Rome's mayor said Saturday.

"The pope authorized me to say that in his view organ donation through generosity must be encouraged, but the commercial use of organs is immoral," mayor Ignazio Marino said, after meeting with Francis on Friday.