Contraceptive vaccine: new hope for the overcrowded world?

The overall rate of fertilization in humans has contributed to sustained increases in the world population and the added urgency of the need to develop new, effective contraceptive strategies. One potential approach to preventing fertility is to disrupt sperm-egg interaction or embryonic-maternal communication during early pregnancy with immunological reagents. This has lead to the principal concept of "contraceptive vaccine" which may become available in the near future.