The WHO report attributed the cause of diseases to rapidly increasing world population, intensive farming practices and changes in human and sexual behaviour.
"It would be extremely naive and complacent to assume that there will not be another disease like AIDS, another Ebola, another SARS (Severe Acute Respiratory Syndrome), sooner or later," the 2007 World Health Report titled, A Safer Future, said.
Warning that AIDS and 38 other new pathogens afflicting mankind were unknown a generation ago, WHO said that new diseases have been identified at the "unprecedented" rate of one or more per year making them difficult to be treated.
WHO report also points to passenger flights, now numbering more than 2 billion a year, as being a major factor for spreading diseases rapidly across continents.
The threat from food-borne diseases, chemical, biological or nuclear accidents or attacks and industrial pollution was also considered as other factors contributing to global spread of diseases.
Calling for renewed international efforts to share information, the WHO said, "No single country, however capable, wealthy or technologically advanced, can alone prevent, detect and respond to all public health threats."
WHO's new report was issued to stress on world's health and convince governments to adhere to new, tighter International Health Regulations.
