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.
Heart is the most important organ of the human body. It lies in the thoracic cavity. It is divided into four chambers, two atria and two ventricles. Upper left chamber is called as the left atrium; lower left chamber is the left ventricle. Upper right chamber is called right atrium and lower right chamber is the right ventricle. Atria receive blood, whereas ventricles pump blood to the body.