that emerging diseases , <*> have occurred throughout recorded history .
Fundamental determinants , <*> seem to underlie their emergence ,
By examining a number of historically notable epidemics , we suggest that emerging diseases , similar in their novelty , impact , and elicitation of control responses , have occurred throughout recorded history .
Fundamental determinants , typically acting in concert , seem to underlie their emergence , and infections such as these are likely to continue to remain challenges to human survival .