RadioMD News... I'm John Byrd.Florida health officials are investigating two more mysterious cases of Zika infection that do not appear to be related to travel, bringing the total to four. The cases have raised the possibility that mosquitoes in the U.S. have begun to spread the disease.Scientists have identified a method by which the immune system can fight a chlamydia infection. The finding could help harness a more effective treatment for the infection, report the researchers.And... want to improve your memory? New research suggests that can be achieved by administering a slight zap to the brain with electricity while you sleep. When you sleep, your brain is not idle, but is in fact actively storing things that you learned during the day for later use. Stimulating the brain enhances what the brain is already doing naturally, say experts. I think maybe I'll just stick to doing crossword puzzles.For RadioMD News, this is John Byrd. Hear health talk interviews with top experts at RadioMD dot com.