• mice develop spontaneous experimental autoimmune encephalomyelitis (EAE) at high frequency
• in the eight backcross generation to SJL/J, more than 80% of females, and more than 60% of males, develop EAE within 160 days
• typically, EAE starts with relapsing-remitting (RR) in females, with the first attacks often resolving completely, followed by further bouts
• in a set of mice, the initial bout is dominated by ataxia, with affected mice unable to walk along a straight line, deviating and falling to the side, but not showing limb weakness or paralysis
• in many cases, mice recover completely until a first relapse, commonly showing hind limb paralysis
• later disease episodes mainly show classical paralytic EAE
• RR disease is more common in females than males
• minority of females develop progressive EAE from the beginning whereas, more than 50% of males develop primary progressive EAE
• EAE lesions show prominent deposits of Ig and some activated complement
• mice treated with anti-CD20 antibody to deplete B cells, show suppression of RR-EAE when started at young age