Several factors contribute to the emergence and re-emergence of infectious diseases, but most can be linked with the increasing number of people living and moving on earth: rapid and intense international travel; overcrowding in cities with poor sanitation; changes in handling and processing of large quantities of food ...

Why do diseases re emerge?

Reemerging diseases are diseases that reappear after they have been on a significant decline. Reemergence may happen because of a breakdown in public health measures for diseases that were once under control. They can also happen when new strains of known disease-causing organisms appear.

Why are infectious diseases on the rise?

Due to intense human traffic, the spread of infectious diseases can be led to new areas at any time. Viruses present in rural areas of the world, such as rural areas of Africa or Asia, may show up in more developed parts of the world, such as in Europe or the United States.