Herpesviridae - Alphaherpesvirinae - Equine Herpesvirus 4

Question 1

What is EHV-4 also known as?

Answer 1

Equine viral rhinopneumonitis

Question 2

Where is EHV-4 endemic?

Answer 2

Worldwide

Question 3

How is EHV-4 transmitted?

Answer 3

Droplet infection

Question 4

What are some characteristics of EHV-4?

Answer 4

Death is rare.
Less severe tissue destruction than EHV-1
Rarely causes abortion
Rarely results in viremia

Take home message- EHV-1 is worse than EHV-4

Question 5

What are the clinical signs of EHV-4?

Answer 5

Upper respiratory tract disease -- rhinopharyngitis and tracheobronchitis
Nasal discharge that can be mucopurulent
Increased lung sounds
Mild coughing
Fever
Abortion is rare

Question 6

Where would does vaccination work for EHV-1 and EHV-4?

Answer 6

Prevent infection of suckling foals and latency of infection in pregnant mares

Question 7

How is EHV-1 and EHV-4 transmitted to foals?

Answer 7

Infected mare passes EHV to foal.

Foal sheds the virus and acts as a source of infection for other pregnant mares.

Question 8

What do all three types of EHV vaccines claim protection against?

Answer 8

Abortion

Only 2 claim respiratory (prodigy does not)