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It can also be caused by a bacterial infection from an open wound or an opening from a surgical procedure, such as knee surgery. In adults and children, common bacteria that cause acute septic arthritis include Haemophilus influenza, staphylococcus, and streptococcus.These foreign invaders enter the bloodstream and infect the joint, causing inflammation and pain.ther infections, such as those caused by viruses and fungi, can also cause arthritis. Viruses include: 1  Hepatitis A, B, and C. 2  Parvovirus B19. 3  Herpes viruses. 4  HIV (AIDS virus). 5  HTLV-1. 6  Adenovirus.
A. A. Unlike osteoarthritis, a condition caused by wear and tear on joints, rheumatoid arthritis happens when your immune system targets your joint linings. Itâs a long-term condition that also affects other tissue, but the joints are usually the most severely affected. Doctors donât know exactly what causes RA.It may be a combination of genes and other things. Some researchers think an infection with a bacteria or virus can trigger the disease in some people, but so far, they donât know what virus or other organism does that.octors donât know exactly what causes RA. It may be a combination of genes and other things. Some researchers think an infection with a bacteria or virus can trigger the disease in some people, but so far, they donât know what virus or other organism does that.