http://www.cdc.gov/malaria/about/history/panama_canal.html malarial malarial malarial malarial malarial http://www.cdc.gov/malaria/about/history/panama_canal.html Gorgas sprang into action http://www.cdc.gov/malaria/about/history/panama_canal.html Gorgas sprang into action malaria episode during the construction of the Panama Canal http://www.cdc.gov/malaria/about/history/panama_canal.html development of mosquito control