The world has witnessed enormous development in various fields of sciences including the medical sciences during the last century. We are now able to explain many diseases on the basis of our recent knowledge on the outline of human genome. But in spite of these huge developments in medical fields, the world is still facing continuous threats from emerging and resurgent infectious diseases like ‘Avian Flu’, HIV, Hepatitis-B, Hepatitis-C and Tuberculosis. The infectious diseases remain the major causes of morbidity, mortality and loss of productivity in the population, particularly in the developing countries. In the past the developed countries were a bit complacent as well as boast of their modern health facilities and preventive health programs to contain the spread of infectious diseases amongst themselves. But in recent years due to increased globalization the picture has changed and they are now very much scared of infectious diseases like Avian flu, Hepatitis, Tuberculosis and HIV. Now a days increased global mobility has aided the spread of infectious diseases and allowed previously localized pathogens to establish themselves world wide. And due to this increased global mobility of economical migrants and international travelers the health problems of the developing countries has added new dimensions to the health problems of the developed world as well as the emerging economic giants of different regions. It is well known that the infectious diseases cause nearly 25% of all human deaths. In recent years the peoples of every region of the world are at risk of contacting some sorts of infectious diseases, both known and unknown due to this movement of population around the world. We understand every society and Government of each and every country is very much concerned with this global problem.
