Hi Willander,
it is not a contradiction if filtration is understood. If you are a healthcare worker, putting masks (paper/ fabric) on the infected inpatients shows some benefit at reducing the infectitivity of patients in an healthcare setting. The reason is they may cough /sneeze in your face. Note the masks are worn by the patients not the staff for this benifit.
For general population wearing a mask that is NOT a respirator ie face sealed and appropriate filtration pore size (HEPA minimally, see my earlier post) is ineffective. plus as I have said earlier you need eye protection The simple reason is you breathe around the mask not through it, the resistance, if it was of viral filtering size, needs the face seal of a RESPIRATOR. The Paper/fabric masks are for blood splatter/ bacterial aerosols from aspiration/irrigation/orthopaedic type medical equipment and stop the medical profession dribbling into wounds. Bacteria can be seen with a normal optical microscope, viruses with an ELECTRON microscope, 0.000,000,030m diameter and that is very small!.
The PPE used by healthcare workers at risk as in ITU is an external (HEPA+) filter and pump into a positive pressure hood/head set.
The WHO accepted their own paid for analysis of mask effectivity which showed NO BENEFIT to general population, why now do they wish to go against their own accepted expert opinions?.
The answer is simply to ramp up the fear level!
WHO in 2010 predicted 9 million deaths worldwide for swine flu, in fact there were 18,000 actual deaths from it , twice Obama invoked a national emergency based on their opinion (See Margaret Chan head of WHO at the time and her wonderful video warning, the world wasting 70 million useless flu vaccination doses which went to landfill costing $48billion, Oh and she forgot to mention her pay from drug companies)
Nothing is as it seems, look beyond the hype, why the financial destruction of countries on a worldwide basis, from an organisation (THE UN) they will no doubt put out a commemorative chocolate teapot memento!
Don't add to their hype with a mask, I wouldn't wear one and I am at the at risk age!