Table 2.

Potential sources and transmission patterns of emerging respiratory viruses

	Potential sources	Transmission patterns
Middle East respiratory syndrome coronavirus	Human patients, camels, bats, and environment (camel farms)	Human-to-human (59%), sporadic
Human adenovirus 14p1	Human patients and asymptomatic shedders	Sporadic, human-to-human (close and frequent contact)
H7N9 avian influenza virus	Live birds, poultry, environment (bird markets, poultry farms, wet markets — soil and surface waters), and human patients	Direct contact with live poultry, human-to-human (possible but restricted and non-sustainable)
H10N8 avian influenza virus	Live birds and poultry, environment (soil and surface water)	Exposure to poultry
H3N2 variant influenza virus	Pigs, pig environments (agriculture fairs), and human patients	Direct or indirect contact with pigs, human-to-human (possible but restricted and non-sustainable)