Microbiology 30 yrs old farmer treated initially with chloroquine for uncomplicated malaria now has an episode of relapse, what could be the reason for relapse? A P. vivax has a significant level of chloroquine resistance. B P. vivax has a persistent exoerythrocytic stage (hypnozoite). C P. vivax has a persistent erythrocytic stage. D Chloroquine is not one of the drugs of choice. 💡 Explanation 30 yrs old farmer treated initially with chloroquine for uncomplicated malaria now has an episode of relapse, what could be the reason for relapse? ✓ Correct Answer: B. P. vivax has a persistent exoerythrocytic stage (hypnozoite).