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Diseases of molluscs

Viral diseases—Abalone viral mortality

Signs of disease

Important: animals with disease may show one or more of the signs below, but disease may still be present in the absence of any signs.

Clinical signs of disease in an infected animal
Gross signs of disease in an infected animal

Disease agent

Abalone viral mortality is caused by a number of spherical viruses. Four spherical virus types have been implicated: type I is the least virulent, resulting in poor conditioning and reduced growth rates; types II, III and IV are highly virulent, resulting in mass mortalities.

Host range

Molluscs known to be susceptible to abalone viral mortality
abalone* (Haliotis hannai)
abalone* (Haliotis diversicolor)
turban shell* (Turbo sp)
mussel* (Mytilus edulis)

* naturally susceptible (other species have been shown to be experimentally susceptible)

Presence in Asia–Pacific

Abalone viral mortality disease is not officially reported from any country in the region, but is known to be present in some parts of the region.

Epidemiology

Differential diagnosis

The differential diagnostic table and the list of similar diseases appearing at the bottom of each disease page refer only to the diseases covered by this field guide. Gross signs observed might well be representative of a wider range of diseases not included here. Therefore, these diagnostic aids should not be read as a guide to a definitive diagnosis, but rather as a tool to help identify the listed diseases that most closely account for the gross signs.

Similar diseases

No similar diseases are known in abalone.

Sample collection

Because of uncertainty in differentiating diseases using only gross signs, and because some aquatic animal disease agents might pose a risk to humans, you should not try to collect samples unless you have been trained. Instead, you should phone your national hotline number and report your observations. If samples have to be collected, the agency taking the call will advise you on what you need to do. Local or district fisheries/veterinary authorities could advise you on sampling.

Emergency disease hotline

For your national emergency disease hotline number, see Whom to contact if you suspect a disease.

Further reading

The currently accepted procedures for a conclusive diagnosis of abalone viral mortality are summarised at
http://www.oie.int/aac/eng/cards/en_diseasecard.htm

These hyperlinks were correct and functioning at the time of publication.


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