The death toll has risen to six in an outbreak of fungal meningitis that's tied to surgical procedures in a city along the U.S.-Mexico border, and health officials say they have not been able to reach everyone who may be at risk of infection.
More than 200 patients could be at risk of fungal meningitis after having surgical procedures in Matamoros, across the border from Brownsville, Texas, between Jan. 1 to May 13 of this year.
