Sadly true! But the question of building environment control needs to be looked at given that the danger of cross contamination is mainly indoors. That would mostly be from contact with objects, but office air conditioning or lack of it would be a concern. The ignorance of managers and staff about air quality in this country is appalling. In my own trials and tribulations at work I discovered that those big square filter and fan units in the ceilings of many buildings are not always true ‘air con’, they are a con!
There are plumbing points for a fresh air make up to the units, but many are not used. The air is simply taken up in the central square panel filtered, cooled or heated then blown back down from the four peripheral vents. They are then simply called ‘comfort units’. Some comfort!
Not having to heat or cool the air from a 10% fresh air make up saves the business a lot of money, but doesn’t do the occupants much good. CO2 levels just keep rising through the day. The outside average CO2 levels are around 385ppm, but people with sensitive lungs have a threshold of 600-700 ppm indoors. One of my desks averaged 1495ppm and could hit over 2500 at the end of a bad day. Another problem is that the comfort units go into overload when workers decide they need more oxygen so open the windows. One of the offices l worked in even had a stupid standing order that no one was allowed to open the windows. Completely at odds with current advice on Covid.
I don’t know how spent air from a Covid infected persons lungs is dealt with by the basic filters in air con units, but I would be asking questions if I had to work in such buildings again!