In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow. The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.
Cytomegalovirus (CMV) is a common virus that can infect almost anyone. Most people don't know they have CMV because it rarely causes symptoms. However, if you're pregnant or have a weakened immune system, CMV is cause for concern.Once infected with CMV, your body retains the virus for life.However, CMV usually remains dormant if you're healthy. CMV spreads from person to person through body fluids, such as blood, saliva, urine, semen and breast milk. CMV spread through breast milk usually doesn't make the baby sick.owever, if you're pregnant or have a weakened immune system, CMV is cause for concern. Once infected with CMV, your body retains the virus for life. However, CMV usually remains dormant if you're healthy. CMV spreads from person to person through body fluids, such as blood, saliva, urine, semen and breast milk.
RSV: A Pervasive Infection with Figure 1: Respiratory Syncytial Virus Structure Lifelong Reinfections RSV is an RNA virus that was isolated in the mid-1950s from a captive chimpanzee with upper respiratory tract illness.12 It is classified in the Paramyxoviridae family, which includes parainfluenza, meta-pneumovirus, and measles viruses.