ABO blood groups and isoagglutinins in systemic lupus erythematosus.

In 45 patients with SLE the frequency of groups B and AB exceeded that of the controls, the difference reaching the double of the standard error. The isoagglutinin titers were quite similar in the two series. There was no association of the disease with the frequency of the secretor type nor with the quantity of group substances or isoagglutinins present in saliva and urine.

Lectins detecting group C streptococci.

Lectin of Wisteria floribunda specifically agglutinates group C streptococci. The reaction is strongly inhibited by N-acetyl-d-galactosamine, slightly by lactose, and not at all by galactose. The utility of the simple test of the lectin with group C streptococci is discussed.