On the other side of it, however, infecting healthy people is really close to the final thing that should be done in isolating the virus. But it is supposed to be done by researchers, in a closed environment... not by the Government in the public.
To find out what the virus really is, researchers need to:
1. get a sick person;
2. take some fluid or other material from the sick person's lungs/body;
3. separate the material using filtration and centrifugalization, and other means if available;
4. detect which of various, different viral particles exist in greatest abundance, well above the others in number;
5. infect many healthy test subjects with each kind of abundant virus particle to see who gets sick from what;
6. later, all of the test subjects need to have bodily material tested as in 1 thru 4, above, to see if they have the same virus particles in them, making them sick. Obviously, if they aren't sick, the virus tested isn't contagious. Note that, there will always be a few people who will get sick from just about anything.
Numbers 5 and 6, above, have never been done anywhere... at least that is publicly recorded widely enough that the average doctor can find the report. Since they (5 and 6) haven't been done, we really don't know FOR A FACT which virus is making people sick. All that the British are doing is trying to ascertain for themselves what is really making the people sick.
Most of the USA and British people don't understand what the British Government is doing, and why it should be done. The USA isn't smart enough to do this... or is smart enough to do it in secret so that they don't alarm the people. Trump probably had it done in the US, and
that is why he is as sure of himself as he is.