USMLE How to explain poultry-to-human one-way transmission?

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

pzh200707

Full Member
7+ Year Member
Joined
Aug 8, 2015
Messages
18
Reaction score
2
UW question: transmission of the influenza was originally thought to occur only through contact with poultry, but during the outbreak, sustained human-to-human transmission was observed. What is responsible for the infectivity of the virus in humans? ---genetic reassortment

If the influenza can spread from poultry to human, I think the HA and NA should target on both human and poultry cells. But why can't it spread from human to human?
 
Top