A real-world test of Pfizer's COVID-19 vaccine in more than half a million people confirms that it's very effective at preventing serious illness or death, even after one dose. Wednesday's published results, from a mass vaccination campaign in...

Scientists are reporting troubling signs that some recent mutations of the virus that causes COVID-19 may modestly curb the effectiveness of two current vaccines, although they stress that the shots still protect against the disease. Researchers...

Two new studies give encouraging evidence that having COVID-19 may offer some protection against future infections. Researchers found that people who made antibodies to the coronavirus were much less likely to test positive again for up to six...

A daily pill combining four cholesterol and blood pressure medicines taken with low-dose aspirin cut the risk of heart attacks, strokes and heart-related deaths by nearly one third in a large international study that's expected to lead to wider use...

The experimental antibody drug given to President Donald Trump has been called one of the most promising approaches to preventing serious illness from a COVID-19 infection. Its maker, Regeneron Pharmaceuticals Inc., said the company agreed to supply...

The nearly 1 million people around the world who have lost their lives to COVID-19 have left us a gift: Through desperate efforts to save their lives, scientists now better understand how to treat and prevent the disease — and millions of others m...

With a coronavirus vaccine still months off, companies are rushing to test what may be the next best thing: drugs that deliver antibodies to fight the virus right away, without having to train the immune system to make them. Antibodies are proteins...

An experimental blood test was highly accurate at distinguishing people with Alzheimer's disease from those without it in several studies, boosting hopes that there soon may be a simple way to help diagnose this most common form of dementia. Developi...

New research suggests that antibodies the immune system makes to fight the new coronavirus may only last a few months in people with mild illness, but that doesn't mean protection also is gone or that it won't be possible to develop an effective...

Fresh studies give more information about what treatments do or don't work for COVID-19, with high-quality methods that give reliable results. British researchers on Friday published their research on the only drug shown to improve survival -- a chea...

A small study strengthens evidence that a pregnant woman infected with the coronavirus might be able to spread it to her fetus. Researchers from Italy said Thursday that they studied 31 women with COVID-19 who delivered babies in March and April....

Several authors of a large study that raised safety concerns about malaria drugs for coronavirus patients have retracted the report, saying independent reviewers were not able to verify information that's been widely questioned by other scientists....

Leaders of a large study in the United Kingdom that is rigorously testing the malaria drug hydroxychloroquine and other medicines for hospitalized COVID-19 patients say they will stop putting people on the drug because it's clear it isn't helping. Re...

A malaria drug President Donald Trump took to try to prevent COVID-19 proved ineffective for that in the first large, high-quality study to test it in people in close contact with someone with the disease. Results published Wednesday by the New Engla...

Malaria drugs pushed by President Donald Trump as treatments for the coronavirus did not help and were tied to a greater risk of death and heart rhythm problems in a new study of nearly 100,000 patients around the world. Friday's report in the...

WASHINGTON (AP) — Making himself an example for using a malaria drug against the coronavirus, President Donald Trump sent the White House scrambling Tuesday to defend his decision amid medical concerns the unproven treatment could spark misuse of a...

For the first time, a major study suggests that an experimental drug works against the new coronavirus, and U.S. government officials said Wednesday that they would work to make it available to appropriate patients as quickly as possible. In a study...

WASHINGTON (AP) — U.S. regulators on Friday allowed emergency use of the first drug that appears to help some COVID-19 patients recover faster, a milestone in the global search for effective therapies against the coronavirus. The Food and Drug A...

Scientists on Wednesday announced the first effective treatment against the coronavirus — an experimental drug that can speed the recovery of COVID-19 patients — in a major medical advance that came as the economic gloom caused by the scourge dee...

WASHINGTON (AP) — The U.S. Food and Drug Administration on Friday warned doctors against prescribing a malaria drug touted by President Donald Trump for treating the new coronavirus except in hospitals and research studies. In an alert, regulators f...

The new coronavirus made Dr. Jag Singh a patient at his own hospital. His alarm grew as he saw an X-ray of his pneumonia-choked lungs and colleagues asked his wishes about life support while wheeling him into Massachusetts General's intensive care...

It can spread person to person, even if someone is showing no symptoms. The next in line can continue to pass it on. The incubation period is so long that people may not know where or when they picked it up. Details that emerged last week about the...

SAN DIEGO (AP) — A drug that curbs delusions in Parkinson's patients did the same for people with Alzheimer's disease and other forms of dementia in a study that was stopped early because the benefit seemed clear. If regulators agree, the drug c...

PHILADELPHIA (AP) — People with severe but stable heart disease from clogged arteries may have less chest pain if they get a procedure to improve blood flow rather than just giving medicines a chance to help, but it won't cut their risk of having a... Full story

Biogen Inc. said Tuesday it will seek federal approval for a medicine to treat early Alzheimer's disease, a landmark step toward finding a treatment that can alter the course of the most common form of dementia. The announcement was a surprise...