On Jan. 3, 1978, the U.S. Food and Drug Administration (FDA) licensed the Monovalent group A (Menomune-A by Connaught), group C (Menomune-C by Connaught) meningococcal vaccines, and a bivalent vaccine for both groups A and C (Menomune-A/C by Connaught).

Meningococcal disease is a serious and global life-threatening disease. Six serogroups (A, B, C, W-135, X, and Y) account for the majority of meningococcal disease worldwide.