A term infant is born to a 22-year-old mother who was diagnosed with primary syphilis during the 37th week of pregnancy and received a single dose of intramuscular benzathine penicillin G. Her RPR titer at diagnosis was 1:64, and at delivery two weeks later, it is 1:32. The infant is asymptomatic with a normal physical exam, and the infant’s RPR is 1:16. According to the evaluation algorithm, this infant’s situation is best categorized as?