Episode 21: Health Issues Specific to Swine Operations

What are some pertinent aspects of pathogenesis and transmission of PRRS virus?

• persistent viremia

• enveloped RNA virus

• predilection for macrophages in resp tract

• virus becomes attracted to lymphoid tissue → undergoes first wave of replication

List some clinical syndromes caused by PRRS virus?

• Respiratory infections → in growing pigs

• Reproductive failure → infertility

• Immunosuppression → increase risk of other dxs

State two possible goals that a swine operation may choose in dealing with the aftermath of a PRRS outbreak.

1. Stabilization → ensuring immunity in all breeding stock

2. Elimination → removal of any remaining PRRS-positive pigs

Describe clinical syndromes caused by Porcine Circovirus.

• wasting

• resp distress

• stomach ulcers

• jaundice

• anemia

• diarrhea

• dermatitis

• death

What are some bacterial and viral agents associate with respiratory disease?

1. Viruses

• Porcine Reproductive & Respiratory Syndrome (PRRS)

• Swine Influenza Virus (SIV)

• Porcine Circovirus (PCV-2)

2. Bacteria

• Mycoplasma hyopneumoniae

• Pasteurella multocida

• Actinobacillus pleuropneumoniae

• Streptococcus suis

• Glaesserela parasuis

• Eyrsipelas

What are some agents that cause neonatal pig diarrhea?

• ETEC

• Clostridium perfringens (Type C & D)

• Clostridium difficile

• Rotavirus

• Porcine Epidemic Diarrhea

• Coccidia

Describe the effects of PED virus infection.

• diarrhea

• dehydration

• rapid death

Give examples of diseases covered in common swine vaccination programs.

1. Mycoplasma hyopneumoniae

2. PCV-2 (Circovirus)

3. Swine influenza

4. PRRS

5. Parvovirus

6. Leptospirosis

7. ETEC

8. Clostridium perfringens

9. Rotavirus

Why is the PRRS vaccine not used in herds that are not currently affected with PRRS?

PRRS virus is very adaptable and contains many strains → by using a vx, you might introduce the virus → may mutate and cause issues

What bacteria causes proliferative ileitis?

Lawsonia intracellularis