Evidence is mounting that having COVID-19 may not protect against getting infected again with some of the new variants. People also can get second infections with earlier versions of the coronavirus if they mounted a weak defense the first time, new research suggests. How long immunity lasts...

When Dr. Stanley Fineman started as an allergist in Atlanta, he told patients they should start taking their medications and prepare for the drippy, sneezy onslaught of pollen season around St. Patrick’s Day. That was about 40 years ago. Now he tells them to start around St. Valentine’s...

Emmanuel Conteh negotiates the muddy, rutted pathways in shorts and torn plastic flip-flops and says he can’t sleep in his heavy canvas tent at night because of the cold. He laments the “hellish” conditions in ethnically divided Cyprus’ cramped Pournara migrant reception camp,...

Around 95 Arab personalities and Christian clerics have petitioned French, American, German and British governments to lift the sanctions set against the Assad regime for having caused a humanitarian crisis in Syria, according to the petitioners; a message which Syrian analysts unanimously...