A answered. Once the bacteria from a cat scratch reaches the blood stream, cat scratch disease (CSD) can spread to various parts of the body. Swollen lymph nodes closest to the scratch or bite are the most noticeable symptom. Most often these are the lymph nodes in the head, neck or upper limbs.
The upper three regions comprise the remaining 24, and are grouped under the names cervical (7 vertebrae), thoracic (12 vertebrae) and lumbar (5 vertebrae), according to the regions they occupy. Source(s): http://en.wikipedia.org/wiki/Vertebrae.
Of the seven subjects with 23 presacral segments, five had 11 thoracic and five lumbar vertebrae, and two had 12 thoracic and four lumbar vertebrae. Of the five subjects with 25 presacral segments, one had 13 thoracic and five lumbar vertebrae, and four had 12 thoracic and six lumbar vertebrae.