Liberia said on Wednesday a second patient had died in a resurgence of the Ebola virus and the outbreak had spread to its capital city.

The sixth confirmed case since the virus re-emerged at the end of June was a healthcare worker in Monrovia, chief medical officer Francis Karteh said on state radio.

A group of scientists checked a decade's worth of data about what causes concussions in U.S. high school soccer. Their conclusion: While a ban on heading would help decrease head injuries, what the game really needs is better enforcement of rules restricting all sorts of player-to-player contact.

A paper published on Monday by a group of Denver-area doctors sheds a different light on what results might come from a campaign led by U.S. international Brandi Chastain and other women soccer stars to ban headers for players 14 and under.

New research suggests it may be possible to predict which preschoolers will struggle to read — and it has to do with how the brain deciphers speech when it's noisy.

Scientists are looking for ways to tell, as young as possible, when children are at risk for later learning difficulties so they can get early interventions. There are some simple pre-reading assessments for preschoolers. But Northwestern University researchers went further and analyzed brain waves of children as young as 3.

U.N. Secretary-General Ban Ki-moon said Tuesday the world was headed for a "generation free of AIDS", after UNAIDS reported a 35 percent drop in new HIV infections from 15 years ago.

"The world has delivered. We have achieved and exceeded the... goals regarding AIDS. We have 15 million people on HIV treatment. We are on the way to a generation free of AIDS," Ban said in the Ethiopian capital Addis Ababa, where he is attending a global development summit.

Heading gets criticism in youth soccer, but limiting rough play might be a better way to prevent concussions and other injuries, a nine-year study of U.S. school games suggests.

More than 1 in 4 concussions studied occurred when players used their heads to hit the ball. But more than half of these heading-related concussions were caused by collisions with another player rather than with the ball. These collisions included head-to-head, elbow-to-head and shoulder-to-head contact, said Dawn Comstock, a University of Colorado public health researcher who led the study.

For pregnant women, abnormal results from certain prenatal tests may signal that something is wrong — with the moms-to-be, not the fetus, a preliminary study suggests.

Very rarely, these results may indicate cancer in the women when follow-up testing shows the fetus is healthy.

The first vaccine against Ebola that patients can inhale instead of inject has shown promise in tests on monkeys and should move into human trials soon, researchers said Monday.

The study in Journal of Clinical Investigation was led by researchers at the University of Texas Medical Branch at Galveston and the U.S. National Institutes of Health. 

New HIV infections have dropped by 35 percent from 2000 but the world needs to dramatically step up investment as well as access to treatment to roll back AIDS, UNAIDS said Tuesday.

There have been remarkable strides with the advent in 1996 of antiretroviral drugs, which suppress the human immunodeficiency virus (HIV), but a lot more needs to be done, the UN agency said.

The $1,000 pill for a liver-wasting viral infection that made headlines last year is no longer the favorite of patients and doctors. The new leading pill for hepatitis C is more expensive, and the number of patients seeking a cure has surged.

Sovaldi, last year's wonder drug, has been pushed aside by a successor called Harvoni, made by the same company. The sticker price for Harvoni is $1,350 a pill.

The European Medicines Agency said Monday it has started a review of cervical cancer vaccines to see if they are linked to two rare conditions, but emphasized it hasn't changed its recommendations for how the shots should be used.

The vaccines against HPV have been used in more than 70 million people worldwide and prevent cancers caused by HPV, including those of the cervix and womb.