Rheumatoid factor (RF) is an antibody that can be found in the blood of some people with rheumatoid arthritis (RA) and other autoimmune diseases. RF can also be elevated in certain infections: "Rheumatoid factor existed in high frequency and high titre among patients with salmonella" https://doi.org/10.1016/0035-9203(72)90059-4
Answered 3/24/2023
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