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Flashcards in Pig Respiratory Disease Deck (36)
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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.