Measles is a highly contagious virus is spread by coughing and sneezing, close personal contact or direct contact with infected nasal or throat secretions. The virus is highly infectious and starts though droplets’, infecting the upper respiratory tract and it leads to critical infection as a result of virus replication in the oropharynx. Sneezing and coughing produces a lot of droplets in the air making the virus airborne and very contagious. When in the nose and throat the virus inhabits the mucus which provides a stable environment for the virus to survive and reproduce. When the virus is expelled out into the air the mucus is carried around it making it possible to survive in the air for two to three hours. The virus may stay in the air or rest on objects or other people. This makes the transfer to another body extremely easy, mostly by touching infected items such as handles of doors. When the virus enters the body an automatic immune response occurs as soon as the virus is detected as a foreign body and the present antibodies will fight off the virus before any symptoms have time to develop. Those who have not received the immunization will be more susceptible to the virus and therefore leading to the further spreading as they will go through a contagious period. When the virus enters the body it needs to spread and multiply in numbers before symptoms start to appear. Measles virus is very contagious and affects mostly impoverished countries more rapidly than already developed countries