Where do the biting and irritating organisms come from?

From outside, through windows and doors – Gnats, mosquitoes (p. 48) Stable flies (p. 48) Thrips (pp. 38 and 200)

From birds’ nests or nesting boxes – Bird fleas (p. 43) Poultry mites (p. 35) Pigeon ticks (p. 36) Martin bugs (p. 45) Forest flies (p. 49)

From dog or cat, or from their quarters – Fleas (p. 42) Certain mites

From other humans – Itch mite (p. 35) Head lice (p. 39) Body lice (p. 39) Crab lice (p. 40) Human fleas (p. 42)

From foodstuffs – Certain mites (p. 35)

When travelling (in hotel rooms) – Bed bugs (p. 43) Fleas (p. 42)

From second-hand furniture or paintings – Bed bugs (p. 43)

From public lavatories – Crab lice (p. 40)

At home, after being in garden or woodland – Animal fleas (p. 42) Ticks (p. 36)
Flower bugs (p. 47)