Cats are the main reservoir for B. henselae. Surveys for B. henselae antibodies in cats in the United States have found average infection rates to be from 25% to 41% in clinically healthy cats. The lowest rates were in the midwest and great plains regions (4-7%) and the highest were in the southeast (60%).

Warmer, more humid climates are most supportive of fleas, which have been shown to transmit B. henselae from cat to cat. It appears that the majority of cats do not become ill when they are infected with this bacterium and kittens are more commonly infected than adults.

Experimental infections in cats, however, have caused a mild illness with fever, anemia, and transient neurological dysfunction. Once infected, cats carry bacteria in their blood for many months. It is important to note, however, that despite widespread presence of B. henselae in cats, CSD itself is uncommon. It appears that CSD is not easily acquired.

While most patients with CSD have a history of a cat scratch or bite, not all do. Some patients have had no contact with cats at all. This makes the exact modes of transmission unclear.

It is likely that CSD can also be contracted from environmental sources of the bacteria or from other animals. For this reason, the term “bartonellosis” is a better way to describe the variety of illnesses that are caused by B. henselae. Recently, it has been found that dogs can become ill with a related Bartonella species and the role of dogs as a possible reservoir for human infection is undergoing study.

CSD is primarily a concern in homes with immuno- compromised people. Since kittens are more likely to carry B. henselae than adult cats, it is recommended that people with compromised immune systems adopt cats older than 1 year of age as pets to reduce the risk of c ontracting CSD. Any cat suspected of carrying B. henselae should be isolated from sick or immuno - compromised individuals.

However, there is no reliable and available diagnostic test to determine if a cat is a carrier of B. henselae. Since carrier cats are always healthy and multiple cases of CSD within a household are rare, euthanasia of a s uspected carrier is not warranted.

Onychectomy (declawing) is also not recommended, since infection can occur without a cat scratch. As is always the case, any cut or scratch should be promptly washed with soap and water. In addition, children should be taught not to tease or annoy cats and rough play should be discouraged. A common sense approach is the best way to safeguard against CSD.
http://www.eliminatecatodour.com