There’s a lot of concern these days about antibiotics, and whether they’re losing effectiveness. Yesterday, L.A.’s Cedars-Sinai Medical Center said four patients there have been infected with a superbug. That’s an antibiotic-resistant bacteria that can cause deadly infections. Sixty-eight more people may have been exposed. The news came on the heels of a similar outbreak at UCLA, where two people died and up to 180 patients might’ve been exposed. Some 23,000 people die every year from superbug infections. So what’s behind this problem, and can we do anything about it?