Hi WS, I actually read an article last week that mentioned susceptibility within the Chinese population.
"There is another matter involving racial susceptibility to this 2019-nCov infection disease. A group of Chinese virologists discovered that at least some Chinese have an extremely large number of a particular kind of cell in their lungs, which relate to regulating both viral reproduction and transmission. They claimed this as the appropriate “biological background for the epidemic investigation of the 2019-nCov.” (16) (17)"
China's Coronavirus: A Global Health Emergency is Launched. What are the Facts - Global Research
On a different note, another article which I found interesting related to a potential hidden source of the spread, being diarrhea.
"Doctors have reported diarrhea infrequently in 2019-nCoV patients admitted to Wuhan hospitals, though it’s been more prominent among reported cases outside the city, including members of a Shenzhen family infected in Wuhan, and more recently in the first U.S. case in Washington state. That patient experienced a two-day bout of diarrhea from which a sample tested positive."
Squat latrines, common in China, lacking covers and hands that aren’t washed thoroughly with soap and water after visiting the bathroom could be a source of virus transmission, said Nicholls, who was part of the research team that isolated and characterized the SARS virus.
A virus-laden aerosol plume emanating from a SARS patient with diarrhea was implicated in possibly hundreds of cases at Hong Kong’s Amoy Gardens housing complex in 2003. That led the city’s researchers to understand the importance of the virus’s spread through the gastrointestinal tract, and to recognize both the limitation of face masks and importance of cleanliness and hygiene, Nicholls said in an interview.
“I think in Wuhan, that would be a very likely place where you might get the transmission” from fecal material, he said. “If it’s using the same receptor as for SARS, I can’t see why it shouldn’t be replicating in the gut.”
Coronavirus Lurking in Feces May Reveal Hidden Risk of Spread