Swine fever

Question 1

1. Virus causing classical swine fever.
2. What other disease is this virus related to?

Answer 1

1. Pestivirus
2. BVD virus.

Question 2

Acute classical swine fever.

Answer 2

High morbidity.
High mortality.
Pigs of all ages.
Pathognomonic signs in finishers.
Economic, health and welfare significance.
Damaging to trade.

Question 3

History of classical swine fever.

Answer 3

First confirmed 1864 in UK (hog cholera).
Spread unchecked until 1878.
Eradicated 1966.
Sporadic outbreaks in 1971, 1986, more severe in 2000.
- 16 farms affected.
- contributed to ban on swill feeding.

Question 4

Classical swine fever clinical signs.

Answer 4

Acute = persistent high temperature, then dullness and off-food.
V+/D+.
Gummed up eyes, cough, blotchy skin discolouration, abortion, still-births, weak litters, hindquarter weakness, convulsions, tremors in newborns, goose-stepping.

Question 5

1. How to distinguish between classical swine fever and African swine fever.
2. Classical swine fever incubation period.

Answer 5

1. Laboratory diagnosis.
2. 5-10 days.

Question 6

Classical swine fever pathological gross features.

Answer 6

Erythema, haemorrhaging LNs, laryngeal petechiae, kidney petechiae.

Question 7

Differential diagnoses to CSF?

Answer 7

ASF, BVDV, salmonellosis, erysipelas, Acute Pasteurellosis, viral encephalomyelitis, streptococcus, lepto, porcine dermatitis and neopathy syndrome.