[fChk]

 Possibly also the vaccines were not completely tested yet and to a certain extent these massive vaccine inocculations are still "in trial and test mode".  So if it doesn't take, then the person can be infectious, and the sad thing of course is one will never really know whether one is clean of the virus with the vaccine.  Unless one continues to be tested.  And even with some tests, one test is never enough.  

In my previous post, I was speaking in general terms but, yes, for COVID-19's vaccines, none of the currently advertised brands are officially approved by the WHO. The 2 US-made mRNA-based vaccines are approved by their local institutions (CDC, NIH etc..) under their emergency Act and they both passed the 3rd phase of their clinical-trials with an advertized 95% efficacy score. So is the Russian Sputnik V vaccine which is an adenovirus-based vector vaccine (technically similar to the one from Oxford-AstraZeneca.) The Russians did deploy their own vaccine -which was the first on the market- under the same emergency rule. The Oxford-AstraZeneca vaccine is at its final stage, as they are manufacturing it in India and should be distributed worldwide to the countries seeking to purchase it.

The advantage of the adenovirus-based vector vaccine is that it doesn't require the highly low temperatures for preservation (5°C instead of -70°C for the Pfizer-BioNTech vaccine for example) making it safer for distributions in 3rd-World countries. Also, there is the cost 3$ a shot instead of 50$ for either Pfizer-BioNTech or Moderna ones.

Simply put, there is a risk -for a small portion of those who will take anyone of those- but it's a race against time and the imperative thing here is to stop the spread, ie reach the herd immunity threashold.

Last night my cousin, who is an ophthalmologist told me that a few months back five of his staff got the virus simultaneously, but very light.  They started with sniffles, and lost their sense of smell.  He then got every one in his business tested, and five tested positively.  Not sure how true this is, but he is convinced that because of the precautions that were taken with face masks and social distancing it could be that they had been subjected to a very light viral load.  Do you think this can be true?   The lighter the viral load the lighter the degree of infection? For him all of them had the virus light and recovered fast.  They had to go into self-quarantine of course, but recovered fast without need for hospitalization.  Do you think they will be needing the vaccine as well though?  

There is a problem with the PCR testing if one doesn't pay attention at the used CT (Cycle Threshold.) High CT values (+30) have a high probability of been a false-positive case.

Please read this article:
> For The First Time, A US State Will Require Disclosure Of PCR 'Cycle Threshold' Data In COVID Tests

But more importantly watch this video from a virologist who got tested positive only to find out that's a false-positive: