CARD9 Deficiency is a rare genetic disorder that affects the immune system. It is caused by a mutation in the CARD9 gene, which is responsible for the production of a protein that helps the body recognize and respond to certain types of bacteria and fungi. People with CARD9 Deficiency are more likely to develop severe and recurrent infections, as well as autoimmune diseases.

The symptoms of CARD9 Deficiency vary from person to person, but may include recurrent fungal infections, recurrent bacterial infections, chronic diarrhea, failure to thrive, and recurrent viral infections. Other symptoms may include skin rashes, recurrent sinus infections, and recurrent ear infections.

CARD9 deficiency is caused by mutations in the CARD9 gene. These mutations can be inherited from a parent or can occur spontaneously.

The main treatment for CARD9 Deficiency is to reduce the risk of infection by avoiding contact with people who are ill, washing hands frequently, and avoiding contact with animals. Antibiotics may be prescribed to treat any infections that do occur. In some cases, immunoglobulin therapy may be recommended to help boost the immune system. In severe cases, bone marrow transplantation may be recommended.

The primary risk factor for CARD9 Deficiency is a family history of the condition. Other risk factors include having a weakened immune system, being of Ashkenazi Jewish descent, and having a mutation in the CARD9 gene.

At this time, there is no cure for CARD9 deficiency. However, medications may be used to help manage symptoms and reduce the risk of infection. These medications may include antibiotics, antifungal medications, and immunosuppressants. Additionally, lifestyle modifications such as avoiding contact with people who are ill, avoiding crowded places, and practicing good hygiene may help reduce the risk of infection.