You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is 30 yrs old farmer treated initially with chloroquine for uncomplicated malaria now has an episode of relapse, what could be the reason for relapse? and explain in detail?
Both Plasmodium ovale and Plasmodium vivax may have resting liver forms, which are very slow to develop into schizonts with merozoites and proceed onto the chloroquine-sensitive erythrocytic stages after treatment is over.