Reacción a "Reactions to the control measures at Spanish airports for passengers arriving from China "

The first thing to ask about any measure is why it is adopted. On the one hand, if it is adopted for fear of high incidence entering Spain, I believe that both the PCR and the vaccination certificate are of very limited usefulness, given that there is already high community transmission in Spain. On the other hand, if it is adopted because of the possibility of the entry of variants in this growth, we should ask ourselves if there are real reasons why this variant is emerging now in China and not in the USA, where transmission has been uncontrolled for months.  

On the other hand, for border control to be effective, it would have to have prior PCR, PCR on arrival and quarantine on arrival, otherwise people who are incubating would be left behind. Finally, if a variant has emerged in China, it is likely that it is already circulating in neighbouring countries, so measures should be extended to all flights, and it should be assumed that there is no transmission here at this stage. As ECDC reports have stated, airport screening measures for new variants can at best delay entry.   

In short, under the two potential reasons for doing so, neither of them would make the proposed measures as effective as expected.