Pig Respiratory Disease Flashcards Preview

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Flashcards in Pig Respiratory Disease Deck (36):
1

changes at weaning for piglets

Moved pens
Mixed with others/larger groups
Change of feed
No mother
Routine treatments
Early weaning - can help, can leave a vulnerable
population

2

Neonatal respiratory disease + pathogens

Progressive atrophic rhinitis
Actinobacillus suis
Bordetella bronchisepticum

3

resp diseases + pathogens in pre-weaned pigs

Progressive atrophic rhinitis
Bordetella bronchisepticum
Inclusion body rhinitis (pig CMV)
Enzootic pneumonia (Mycoplasma sp)
PRRSV (porcine reproductive and respiratory syndrome virus).
Glassers disease (Haemophilus parasuis)

4

Resp diseases + pathogens in weaners, growers and finishers

Bordetella bronchiseptica
Glassers disease
Actinobacillus pleuropneumonia
Pasteurella multocida
Mycoplasma hyopneumonia (EP) / hyorrhinis
PRRSV
Porcine respiratory coronavirus (PRCV)
Influenza
PMWS?/PCVAD
(Aujeszky’s disease (pig herpesvirus 1))

5

Significant resp diseases + pathogens in non-immune adult pigs

Glassers disease
Actinobacillus pleuropneumoniae
Pasteurellosis
Enzootic pneumonia
PRRSV
Influenza

6

Mycoplasma hyopneumoniae

Great economic importance
30-80% pigs have lesions at slaughter
‘enzootic pneumonia’ - only caused by this pathogens
Some evidence of other mycoplasmas being involved
in respiratory disease
in weaned pigs

7

M.hyopneumoniae - clinical signs

coughing
decr food conversion efficiency (FCE)
variation in growth

8

M.hyopneumoniae - diagnosis

Clinical signs
Lung lesions at slaughter
Culture/PCR
Histology
Serology

9

M.hyopneumoniae - epidiology

Direct contact
Carrier sows
Aerosol 2 miles

10

Actinobacilus pleuropneumoniae (APP)

12 subtypes but cross reactions occur
Explosive outbreaks of pneumonia with high morbidity and mortality
Seroconversion with few clinical signs

11

APP - diagnosis

Clinical signs – acute fatal respiratory disease with
fibrinous pleuritis and firm lung infarcts
Culture, PCR
Lung lesions
Serology

12

APP - Epidemiology

Direct contact – esp fighting after mixing
Movement of pigs – aerosol limited
Survives in water/mucus

13

Atrophic rhinitis

Toxigenic Pasteurella multocida with Bordetella bronchiseptica
Less in recent years – better management
Colonisation of nasal mucosa by BS with production of
cytotoxin
PM damages osteoblasts and enhances osteoclast
activity - turbinate bone degeneration

14

Aujeszky’s disease

Swine herpesvirus type 1 (SHV1)
Notifiable and not present in UK (present in NI).
Slaughter policy in UK, targeted vaccination in NI,
Ireland, Spain.

15

Aujeszky’s disease - Clinical presentation

age and strain specific:
<15%
Adult: few clinical signs
Abortion and mummification
URT coughing
Rare neurological signs

16

swine influenza virus (SIV) - clinical signs

Pyrexia, lethargic, prostrate
Skin erythema, anorexic
Severe cough sneezing, dyspnoea
Conjunctivitis
Recovery equally rapid (5 days)
Pregnant sows may abort

17

SIV - diagnosis

Clinical signs
Serology
Virus isolation
Lung lesions help – clear demarcation of lesions in
cranial and middle lobes, interstitial pneumonia

18

Porcine reproductive and respiratory syndrome (PRRS)

Arterivirus
Virus replicates in and destroys macrophages and
endothelial cells → vasculitis
mummified, stillborn or live piglets

19

PRRS - clinical signs

weaned pigs, tachypnoea, thumping, eyelid oedema and conjunctivitis

20

PRRS - diagnosis

clinical signs
Gross pathology - moderate to severe interstitial pneumonia
Virus isolation
Serology

21

PRRS - control methods

Vaccination
Stabilise infection
Eradication
Depop-repop

22

depop-repop method

Infection transmits up to 3km
Purchase uninfected stock and quarantine / test at isolation.
Purchase uninfected semen

23

stabilise infection method

Expose gilts / vaccinate prior to breeding.
Stream grower pigs in separate airspaces

24

PCV-2/PMWS

PCV-2 associated disease – respiratory component is
very important
Immunosuppressive
90% UK pigs seropositive
Involved in many disease syndromes

25

Porcine respiratory coronavirus (PRCV) - Clinical signs

Coughing - In growers and finishers (endemic), Across all age groups (epizootic)
Absence of other causes
Contributes to multifactorial pneumonia
Indicates biosecurity issue on high health herd

26

glassers disease - clinical signs - sows

rarely seen

27

glassers disease - clinical signs - gilts

Lameness / stiffness.
Slight swellings over the joints and tendons.
Meningitis rarely.

28

glassers disease - clinical signs - Piglets - Acute

Rapidly depressed.
Elevated temperature.
Inappetence .
Reluctant to rise.
Characteristic feature a short cough of 2-3 episodes.
Sudden death in good sucking piglets is not uncommon.
arthritis and lameness

29

glassers disease - clinical signs - piglets - chronic

Pale and poor growing pigs.
Sudden deaths may occur.

30

glassers disease - clinical signs - Weaners & Growers

rapidly depressed or may be just found dead.
Elevated temperature.
Stop eating.
Reluctant to rise.
Fever.
Nervous signs - fits and convulsions including meningitis.
Poor pigs, wasting, hairy often result.

31

glassers disease - clinical signs - young growing pigs

Fever.
Mild meningitis.
Arthritis.
Lameness.
Pneumonia.
Heart sac infection.
Peritonitis and pleurisy.
short cough of only 2-3 episodes.

32

parasites

Metastrongylus - earth worm as intermediate host
Ascaris suum - larval migration through lungs

33

vaccination

Dams to confer immunity to young pigs (AR)
Young/weaner pigs (M hyo)
In quarantine/before entry to herd

34

depopulation

Full or partial
Expensive
Uncontrollable disease + cost of disease is unacceptable
Thorough cleaning and down time
Last resort
Location of other pig farms etc

35

partial depopulation

Remove all pigs excluding lactating sows (medicate
sows)
Wean to offsite location for 12 week period
Rest and disinfect weaner and grower accommodation

36

quarantine

Prevent entry of new disease
Acclimatise new animals to diseases on the unit
Sentinel animals
Intake animals of similar health status
Attend animals at end of work day
Off site AI AO
Clinical observations and serology
Use cull sows plus faeces 10:1
Do not use severely ill animals