The Centers for Disease Control and Prevention issued a health alert to physicians, public health authorities and members of the public on Monday after documenting five cases of malaria acquired within the US in the past two months. The cases, four in Florida and one in Texas, are the first in 20 years to be locally acquired, meaning the infections were not related to travel outside the country. The last local cases of this type were identified in 2003 in Palm Beach County, Florida. There is no evidence to suggest that this year's Florida and Texas cases are linked, the…