Daniel Heuclin / Vinchuca (Triatoma infestans) walking across human skin. The bug is a blood feeder, and vector of Chagas disease. Controlled conditions. Bolivia, April.

Piotr Naskrecki / Sand Fly (Lutzomyia sp) feeding on human blood, these flies are vectors of many serious tropical diseases, Guyana. Sequence 3 of 3

Piotr Naskrecki / Sand Fly (Lutzomyia sp) feeding on human blood, these flies are vectors of many serious tropical diseases, Guyana. Sequence 2 of 3

Piotr Naskrecki / Sand Fly (Lutzomyia sp) feeding on human blood, these flies are vectors of many serious tropical diseases, Guyana. Sequence 1 of 3

Doug Wechsler / American Dog Tick / Wood tick (Dermacentor variabilis) adult on skin full of blood; Schuylkill Center, Pennsylvania, USA

Shattil & Rozinski / Wood tick {Dermacentor variabilis} on human skin, North Dakota, USA

Nigel Cattlin / Focus of infection of BYDV (barley yellow dwarf virus) with chlorosis and leaf tipping symptoms in maturing wheat crop in ear. England, UK.