The 'World Health Day' is celebrated on the 7^th of April every year. It is also the day, which marks the founding of the World Health Organization. The primary role of the World Health Day is to zero in on key health-related issues and to raise universal awareness. The theme for the year 2007 is 'international health security', with a special focus on urging world governments, business sectors and other non- governmental organizations to 'invest in health and build a safer future'.

As we have observed in the recent years, there is a universal vulnerability to the out- break of epidemics, climate changes and natural calamities, upsetting nature's balance. These international threats are brought about by some of the inevitable features of 'fast-age' such as increased speed and volume of air travel, vigorous food production and manipulating the environment to suit human needs. This has resulted in the emergence of new epidemic-prone diseases across the globe, while ensuring the rapid spread of the existing ones.

The pressures of the exploding population, urbanization, environmental degradation and changing climate, provides ample opportunities to the microbes- blessed with the ability to mutate and multiply- thereby challenging human existence. Misuse of antibiotics is another factor that worsens the already- grave scenario. Drugs are unable to match the pace at which the resistant variety evolves. Some of the ominous organisms doing the rounds are HIV/AIDS, Ebola, Hanta, Hendra, Nipah, H5A1 causing avian influenza, new variants of the bacterium causing epidemic cholera, microbes responsible for Legionnaire's disease and meningitis.