Also found in: Dictionary, Thesaurus, Encyclopedia.
a malarial fever with paroxysms that typically recur every 48 hours or every other day (every third day, reckoning the day of the paroxysm as the first); the fever is induced by release of merozoites and their invasion of new red blood corpuscles.
a form of malaria caused by the protozoan Plasmodium vivax or P. ovale, characterized by febrile paroxysms that occur every 48 hours. Vivax malaria, caused by P. vivax, is the most common form of malaria. Although it is rarely fatal, it is the most difficult form to cure. Relapses are common. Ovale malaria, caused by P. ovale, is usually milder and causes only a few short attacks. Both types of tertian malaria are treated with chloroquine. Compare falciparum malaria, quartan malaria. See also malaria.
Malaria in which sporulation occurs each 48 hr. Symptoms are more common during the day. Paroxysms are divided into chill, fever, and sweating stages. Cold stage is usually 10 to 15 min but may last an hour or more. Febrile stage varies from 4 to 6 hr. Benign tertian malaria is caused by Plasmodium vivax, malignant tertian malaria by Plasmodium falciparum.
See also: malaria