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adult. egg. larva. nymph. pathogen. first host second host third host. TICK VECTORS TRANSMISSION PATHWAYS OF TICKS. transovarial. transstadial. [ red line = pathogen pathway ]. year 1 year 2 year 3. adult.

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adult

egg

larva

nymph

pathogen

first host

second host

third host

TICK VECTORSTRANSMISSION PATHWAYS OF TICKS

transovarial

transstadial

[ red line = pathogen pathway ]


Slide2 l.jpg

year 1 year 2 year 3

adult

larva

egg

nymph

nymph

ewe sheep 1

ewe sheep 2

TICK VECTORS RESERVOIRS OF INFECTION - TICKS & ANAPLASMA

[ red line = Anaplasma pathway ]


Slide3 l.jpg

larva year 3

larva

nymph

nymph

patent

infection

in lamb

(infection may

die out)

carrier infection

in lamb

TICK VECTORSRESERVOIRS OF INFECTION - SHEEP &

ANAPLASMA

(lamb passes infection nymph to larva instanteously)

lamb at year 1 same animal stressed at year 2


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larva year 3

larva

nymph

nymph

nymph

sheep = disease + transmission hares = transmission dogs = disease but

hosts only hosts dead end hosts

TICK VECTORSDISEASE HOST / TRANSMISSION HOST /

DEAD END HOST (louping ill virus)


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neutrophils --> neutropenia year 3

infected neutrophils

TIME

COMMENSAL ON SKIN

Staphylococcus

aureus

SYSTEMIC

IN JOINT

Anaplasma

transmission

to sheep

TICK VECTORSETIOLOGY OF TICK PYAEMIA


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TICK VECTORS year 3MAINTENANCE OF ENDEMIC STABILITY

(e.g. TICK BORNE FEVER IN SHEEP)

ewe immune to infection

lamb susceptible to infection

but age-resistant to disease

lamb receives no challenge ewe susceptible to infection

and disease


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