Notes15 - Medical Entomology Objectives 1 Describe the different types of medically related effects caused by arthropods(direct and indirect 2

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 1 Medical Entomology Fol icle mite 2 Objectives 1. Describe the different types of medically related effects caused by arthropods (direct and indirect) 2. Define the terms associated with disease transmission 3. Describe the general characteristics of the 7 diseases covered including: •V e c t o r Where it is a problem Disease symptoms How it is treated and controlled Type of disease Flannel moth caterpil ar 3 Introduction Arthropods and insects in particular cause many medically related effects. Directly they can cause dermatitis and allergic reactions. But indirectly they can pass on diseases that can be debilitating and sometimes fatal. Throughout history, arthropods and insects have affected and infected mankind and animals with everything from minor afflictions to major diseases that have caused catastrophic epidemics. In this unit, we will investigate the interaction of arthropods and insects with animals and mankind through direct and indirect means as well as reviewing their use as forensic evidence. Please read pages 376-388 and 392 to familiarize yourself with the terms associated with medical entomology. Blood loss from horn flies feeding on cattle. Read textbook pages 376-388 and 392. 4 Direct Effects - Host Reactions We will begin our discussion with some direct host reactions to arthropods. Some direct effects such as pain and suffering are difficult to measure, but some quantifiable, economic effects include: Mechanical Reactions (dermatosis, dermatitis, itching) Exsanguination (loss of blood, annoyance) Myiasis (dipterous larvae invading living tissues) (envenomization) Allergic Reactions (anaphylaxis) Entomophobia (psychological fear of insects) Let’s take a look at each of these direct effects in more detail. Hemotobia irritans , Horn flies 5 Mechanical Reactions (Dermatosis, Dermatitis, and Itching) Sarcoptes scabiei One causative agent of a mechanical, itching, reaction is a mite infestation. One mite, in particular, is the agent of scabies in humans and sarcoptic mange in other mammals. The scabies mite is an obligate parasite, meaning it must feed on a host in order to complete its lifecycle. After mating, the female mite will burrow under the skin and lay her eggs. She secretes substances that trigger an allergic reaction in the host that results in painful itching. This mite can be passed through close contact between hosts, and can only live for 36 hours outside of the host. Sarcoptic mange found in animals is basically the same as that in humans. Most animals, including cattle, pigs, horses, and dogs, experience the same dermatitis leading to weight and hair loss. Mange mites have been recovered and described
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/23/2011 for the course ENY 3005 taught by Professor Staff during the Spring '08 term at University of Florida.

Page1 / 6

Notes15 - Medical Entomology Objectives 1 Describe the different types of medically related effects caused by arthropods(direct and indirect 2

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online