Which one of the following is an emerging viral disease?
Virus discovery in particular has been greatly facilitated by new nucleic acid technology. These frontiers were first notably explored with high-density microarrays containing spatially arrayed sequences from a phylogenetically diverse collection of viruses. Although biased toward those with homology to known viruses, novel viruses in clinical samples were successfully identified on the basis of their ability to hybridize to these prespecified sequences. This methodology famously contributed to identification of the corona virus causing severe acute respiratory syndrome (SARS). Once discovered, this SARS corona-virus was rapidly sequenced: the full genome was assembled in April 2003, less than 6 months after recognition of the first case. This accomplishment illustrated the advancing power and speed of new diagnostic technologies. 
 
Harrisson Principle of Internal Medicine Ed 19th Pg772
SARS
Chicken pox
Measles
Rabies