Indtoduction - Ectoparasites

6 important questions on Indtoduction - Ectoparasites

What roles do arthropods have in human health?

1. Ectoparasitosis
2. Endoparasitosis
3. Poisoning
4. Allergic reactions
5. Nuisances
6. Delusory parasitosis
7. Vector for disease agents

What are global trends in vector-borne diseases?

1. Lyme steady increase since 80s
2. West Nile rapidly spread since 2000, recently found in NL
3. Chikungya 2005/2006 rare high number on small island
4. Plague still occurs in eg Madagascar, transmitted by flea

How does a mosquito bite work?

1. Mouth part (lips+jaw) have evolved into long piercing organ, made up of different components
2. Feeding channel and small channel connected to salivary glands
3. Saliva contains ~20 polypeptides that contain anti-coagulants, makes it easier to suck up blood. We are allergic to this so IgG and IgE + histamine + bradykinine
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How is the basic reproductive number made up?

It is the number of new cases resulting from the introduction of an infection to a suscepible population.


It included eg transmission coefficient from vector to and from vertebrate, biting habit, incubation period and host recovery rate.

What are barriers when the pathogen ends up in vector?

1. Physical: perithophic membrane, midgut, hemolymph, salivary gland
2. Vector responses: micro-encapsulation, melanization, antibacterial peptides, RNAi, innate immunity

Which vector control strategies are there?

1. Environmental management (napier grass)
2. Biological control (animals to kill target, eg entomopathogenic fungi)
3. Biological manipulation (solar-powered and odour-based mosquito traps)

The question on the page originate from the summary of the following study material:

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