President Donald Trump heaped pressure on U.S. lawmakers Monday to pass a health care reform bill before Congress goes on its August recess, with Republicans teetering on the edge of a potentially major failure.

As Senators returned for work in Washington after a week off, Trump challenged fellow Republicans to make good on their signature campaign promise: repeal and replace "Obamacare," the reforms of his White House predecessor.

A cholera outbreak in Yemen has now surpassed 300,000 suspected cases, the Red Cross said Monday as the war-torn country reels from disease as well as the threat of famine.

The United States, entangled in conflict overseas and struggling economically, was at a fraught moment when the president called for a national health care overhaul.

The country "now spends more than $75 billion annually on health care... yet despite this huge annual national outlay, millions of citizens do not have adequate access to health care."

Two experimental treatments for skin cancer, tailor-made to target a particular patient's tumors, proved safe in small-scale trials, their developers reported Wednesday.

President Donald Trump on Monday offered U.S. help to a British baby with a rare genetic disorder who is due to be taken off life support after courts ruled further treatment would prolong his suffering.

After Umm Mazen found her husband shivering in his bed and complaining of a migraine, he confessed he was addicted to painkillers and could no longer provide for the family.

Vaccines delivered via a painless, throw-away patch could one day eliminate the need for needle-and-syringe flu injections, researchers said Wednesday after completing a preliminary trial.

A cholera outbreak in Yemen, which has claimed 1,400 lives in two months, shows tentative signs of slowing as fatality rates drop by half, the World Health Organization said on Tuesday.

Sri Lanka has suffered a record 200 deaths from dengue fever this year, the health minister said Monday, blaming a garbage disposal crisis in Colombo.

The United States announced Thursday a halt to all imports of fresh beef from Brazil, the world's second-largest producer, citing "recurring" concerns after large shipments failed food safety tests.