[vahy-vaks] 
| the most common form of malaria, caused by the protozoan Plasmodium vivax and marked by the occurrence of attacks every other day. |
vivax malaria vi·vax malaria (vī'vāks')
n.
Malaria in which the paroxysms recur every third day, counting inclusively, and are induced by the release of merozoites and their invasion of new red blood cells. Also called tertian malaria.