Fibrillar anti-cellular antibody associated with mumps and measles infection

Fibrillar anti-cellular IgM antibody was found in sera of 8/10 children with acute mumps infection and in 8/12 children with acute measles infection. Absorption experiments showed that the antibody was against cellular components in cells of human origin and was unrelated to either viral antibody or to RF. Similar antibody was previously found in patients with MS.