BIO 475 - Parasitology Spring 2009 Stephen M

BIO 475 - Parasitology Spring 2009 Stephen M. Shuster Northern Arizona University http://www4.nau.edu/isopod Lecture 24 Subphylum Hexapoda (Insecta) 1.Characteristics a. Six legs, b. Head, thorax abdomen c. Often with winged adults 2. Main Parasitic Orders a. Mallophaga b. Anoplura c. Hemiptera d. Siphonaptera e. Diptera 1 Order Mallophaga Order Anoplura Order Anoplura 1.Vectors of disease a. Rickettsia (typhus) b. Rhochalimaea (trench fever) c. Borrelia (relapsing fever) 2. Important species a. Pediculus humanus humanus (clothing) b. Pediculus humanus capitus (smaller, head) c. Phthirius pubis 2 3 4 Phthirius pubis Infestation 5 6 Order Siphonaptera 1. Are holometabolous insects. a. Have egg -> larvae-> pupae - > adult. Order Siphonaptera Excellent jumpers: Click mechanism in thorax permits 140g force in 1/1000 sec. Equals 800 foot standing jump! Order Siphonaptera Often host specific with particular affinities. Associated with nests or hosts, hair or feathers, surface or burrowing. 7 Nest Associated Most rodent fleas. Including prairie dogs. Xenopsylla cheopis Disease Transmission Plague (Yersinia pestis). Usually associated with Xenopsylla cheopis. Also: Murine typhus Myxomatosis Plague Transmission 8 The bubonic plague was the most commonly seen form of the Black Death. The mortality rate was 30- 75%. The symptoms were enlarged and inflamed lymph nodes (around arm pits, neck and groin). The term 'bubonic' refers to the characteristic bubo or enlarged lymphatic gland. Victims were subject to headaches, nausea, aching joints, fever of 101-105 degrees, vomiting, and a general feeling of illness. Symptoms took from 1-7 days to appear. 9 Host Associated Most fleas including: The human flea, Pulex irritans Rabbit fleas, Nosopsyllus Cat fleas, Ctenocephalides Attached Fleas Chicken fleas (stick tight fleas) Echidophaga Burrowing Fleas Tunga penetrans 10 11 12 13 14 15.

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How Much Do You Know About Fleas, Ticks, Mites and Other Biters? by Vet Glen Cousquer C Norris
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CH •X ANG DF E P Unit T, Viking House, Daneholes Roundabout, Grays, Essex, RM16 2XE, w Click to buy NOW! Tel: 01375 399033, Fax: 01375 385129, Web: www.allanimalsvetclinic.co.uk, w m o w c .d k. ocu•trac Email: [email protected] RABBIT FACT SHEET 1. Understanding Myxomatosis What is myxomatosis? Myxomatosis is a severe viral disease of rabbits that decimated the wild rabbit population when it arrived in Britain 50 years ago. Domestic rabbits are also susceptible to the disease and deaths in pets are reported every year. Is my rabbit at risk? Myxomatosis poses a threat to all pet rabbits – but the risk varies depending on whether your rabbit lives inside or outside. Pet rabbits at greatest risk are those living outside, especially if they may have any contact with wild rabbits or hares. Pet rabbits affected by rabbit fleas are also at very high risk • rabbit owners who also have a dog or cat that hunts wild rabbits (or foxes that visit the garden and nose around rabbit hutches) must be particularly careful, in case rabbit fleas are brought back to the pet bunny. Houserabbits living permanently indoors are at less risk than outdoor rabbits, but can and do get myxomatosis. They must be vaccinated and protected from possible sources of myxomatosis transmission too. How is it spread? Pet rabbits could contract myxomatosis in a variety of ways: • Bites from mosquitoes carrying the Myxoma virus. • Bites from fleas carrying the Myxoma virus (fleas can survive for many months in hay). • Myxomatosis can also be spread by Cheyletiella fur mites.
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