On September 6, a six-year-old boy experienced fever, chills, and vomiting. On September 7, the child was hospitalized with diarrhea and swollen limbs, nodes under both arms. On September 3, he had scratched and bitten by a cat. The cat was found dead on September 5, and white pestice was isolated from the cat. Chloramphenicol was administered to the child from September 7, when white pestice was isolated from his blood. On September 17, the child's temperature returned to normal. On September 12, at 22, the child was released from the hospital. Question. Identify the incubation period for this case of bubonic plague. Option number 1, September 3 to 5. Option number 2, September 3 to 6. Option number 3, September 6 to 7. Option number 4, September 6 to 17.