 The acute phase lasts for the first few weeks or months of infection . It usually occurs <unk> because it is symptom @-@ free or exhibits only mild symptoms that are not unique to Chagas disease . These can include fever , fatigue , body <unk> , muscle pain , headache , rash , loss of appetite , <unk> , nausea , and vomiting . The signs on physical examination can include mild enlargement of the liver or spleen , swollen glands , and local swelling ( a <unk> ) where the parasite entered the body . 
