Boyd's 10 year experience with mosquito transmitted P. vivax malaria therapy in 375 patients studied at the Florida State Hospital . Most infections were with the McCoy strain, and some were with other local "strains" which he considered to behave similarly. Infections which were allowed to continue until self termination did not relapse subsequently . The median interval to relapse was approximately 9 months. Inset is the study of Coatney et al  describing 403 mosquito transmitted infections with the St Elizabeth strain of P. vivax.