I can only assume that aircrew must of had some dispensation as they were not visa applicants and only on stop over.My son,as a passenger needed the visa and an X-Ray to get it issued at that time. He was staying about 3 months or until his money ran out.
Aircrew don't have any dispensation regarding health regs. If anything they are more at risk because they are couped up in a metal tube with people from all over the world for an awful lot of the time. Maybe your son had been in parts of Thailand that were more at risk but I remember SARS, MERS, the one from Mexico (can't remember the name)and a few others and normally a temperature probe at the head and a mask is the only defence for passengers and crew.
// 9 people have died from Coronavirus out of a something like 490 Chinese people who have the disease.//
so that makes the case fatality ratio 10/500 give or take of 2%
peanuts. the case fatality ratio always overestimates the true mortality because of the unrecorded mild cases and the fact a death is hard to mistake.
the experts havent got their act together and for gods sake dont make it political - see the mess of politicizing science on the Greta thread.
an oxford virologist was making a terrible mess of it on radio 4 the other day - kicking off by saying he was sure the Chinese authorities werent lying about the number of cases -- er they were
he also chipped in that corona viruses werent epidemic viruses - weak I thought. Then that they werent sure if it were spread by breath alone (which really does seem to be needed) or by skin contact or clothes ( fomites )
Jesus they dont know squit all about it so they cant really predict
after ebola there were cases heard in court ( GMC actually but what the hell this is AB)
and the public health doctor ( Gent) said, if we get it wrong then no one will ever tell the truth to health admin again
people are being stopped from leaving Wuhan, in the hope i guess that it will contain the virus. 17 dead and hundreds infected, wait till it ends up here, it;s only a matter of time.
It is the wrath of God being visited on the Chinese for their despicable treatment of all animal life, notwithstanding their insatiable lust for ivory & rhino horn which lies behind the needless deaths of these 'protected' creatures - and then there's sharks fins - but don't start me off!