Plasmodium vivax/ovale have a dormant hypnozoite form which infects the liver and can remain dormant. This is why P. vivax/ovale must be treated with primaquine on top of chloroquine (because only primaquine can kill the hypnozoites in the liver) [FA2020 p157]
An additional important fact, Plasmodium vivax/ovale have the "tertian" (48-hour) fever cycle on the first and third day.
NOTE: You would also NOT want to use chloroquine to treat P. falciparum because resistance is too high among that species. However, this is not the reasoning given in the question.
submitted by โcassdawg(1780)
Plasmodium vivax/ovale have a dormant hypnozoite form which infects the liver and can remain dormant. This is why P. vivax/ovale must be treated with primaquine on top of chloroquine (because only primaquine can kill the hypnozoites in the liver) [FA2020 p157]
An additional important fact, Plasmodium vivax/ovale have the "tertian" (48-hour) fever cycle on the first and third day.
NOTE: You would also NOT want to use chloroquine to treat P. falciparum because resistance is too high among that species. However, this is not the reasoning given in the question.