Menactra Vaccine Immunogenicity. Helps protect against 4 vaccineâpreventable serogroups1,2. Immunogenicity proven in clinical trials â confirmed in everyday use1. The immune responses to Menactra and Menomune-A/C/Y/W-135 vaccines were comparable for all 4 serogroups1,6.
The mediastinum is the middle section of the chest cavity. The chest cavity contains the left and right lungs, which lie on either side of the heart. The heart is contained in the portion of the chest known as the mediastinum.
The heart is located in a central tissue mass that divides the ribcage into two cavities between the two lungs. This central tissue consists of the heart, its associated blood vessels, the esophagus, and the trachea. The axis of the heart is tilted so that the apex (tip) of the heart points toward the lower left.