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TICK VECTORS TRANSMISSION PATHWAYS OF TICKS

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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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Presentation Transcript
slide1

adult

egg

larva

nymph

pathogen

first host

second host

third host

TICK VECTORSTRANSMISSION PATHWAYS OF TICKS

transovarial

transstadial

[ red line = pathogen pathway ]

slide2

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

larva

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

slide4

larva

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)

slide5

neutrophils --> neutropenia

infected neutrophils

TIME

COMMENSAL ON SKIN

Staphylococcus

aureus

SYSTEMIC

IN JOINT

Anaplasma

transmission

to sheep

TICK VECTORSETIOLOGY OF TICK PYAEMIA

slide6

TICK VECTORSMAINTENANCE 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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