Insects and Parasites in the BH
There are many insects and parasites, as well as bacteria in any BH and it is these that maintain a balanced mini ecosystem.
On the floor, there are dung beetles that consume the bird shit.
In mid air, there are also many flying insects that are usually hatched from the feces of the birds as the birds often eat insects that are carrying eggs.
There are also other insects like cockroaches that are opportunistic that feed on the remnants of the bird shit.
If one looks carefully, it's like an insect zoo down there, on the floor of your BH.
The birds will naturally carry blood sucking parasites, as do chickens. The greater the population of birds the greater the number of such parasites.
I do not know the life cycle of these parasites but they are natural. An infestation will of course spread to any human entering the BH, similarly with a chicken farm.
There may be a connection between the bird shit on the floor with the hatching of the birds' parasites but no conclusive study has been carried out. In a chicken farm, the birds are sometimes dusted with an insecticide as well as treating the shit on the floor. The similarity in both is that the chickens and swiftlets are both elevated above the shit.
Fendona is a 'Human' safe insecticide as it is approved to be used in areas where food for human consumption is prepared, ie kitchens, restaurants etc. There are many other human safe(by following instructions) insecticides that are by far cheaper. Carbaryl, Sevin is commonly use for this purpose.
Since swiftlets never touch the ground (on purpose) it can be assumed that theses parasites climb up via the walls to infest the birds on the nests, so spraying the walls will kill all the parasites trying to infest theses birds. Continuous regular spraying the floor will destroy the balance as all insects will be killed and this may reduce the 'smell' that the birds are so happy to live with.
If you inspect a nest closely, you'll often see worms/maggots, parasites and eggs on the nests, especially the 2-3 layered nests. These are quite easily removed by first freezing the nests and then blowing them away with compressed air.
I was told about this freezing of nests as well. How long do we pop it into the freezer for? After freezing and blowing it, we need to dry it immediately right ?