RE: Science of pathogen detection10 Oct 2020 12:00
Skid35, this is perhaps the most important question and I have been giving it some thought.
It must involve at least two separate technologies. Firstly a highly sophisticated filtration technique which separates out the various particles of interest [allergens and pathogens] according to size and eliminates the organic and inorganic debris of no interest. We are principally interested in the following: airborne bacteria [eg Legionella], bacterial spores [eg Anthrax], fungal spores [eg Cryptococcus] and of course viruses including Covid19. It would be valuable to identify all of these nasty pathogens, but let's just concentrate on the viruses, the smallest particles passing through the finest filter.
How then do we identify them?
The 'old school' method is by using PCR [Polymerase Chain Reaction] technology, which essentially amplifies small segments of nucleic acid in order to make a big enough sample for the viral genome to be identified. This is the technology used for example by Novacyte with their antigen detecting kits. It is essentially a laboratory technique.
We know that Kromek have said they are not using a 'laboratory technique' and that monitoring is continuous, which leads me to conclude that they are using a spectroscopic method which can identify specific molecules by their charge and mass.
They are therefore targeting proteins on the outside of the virus.