del 8 Flashcards
Picornaviruses are
a. Double-stranded, circular RNA viruses, helical
b. Small, non-enveloped RNA viruses, icosahedral
c. Double-stranded, linear RNA viruses, icosahedral
d. Single-stranded, linear RNA viruses, icosahedral
T: b, d
F: a, c
Family Picornaviridae includes genera
a. Aphtovirus, Rubivirus, Poliovirus.
b. Hepatovirus, Enterovirus, Aphtovirus
c. Pneumovirus, Enterovirus, Vesiculovirus
d. Teschovirus, Enterovirus, Hepatovirus
T: b, d
F: a, c
Foot and mouth disease virus:
a. Is ssRNA linear virus with icosahedral symmetry of capsid
b. Has 7 serotypes – 3 european, 2 african and 2 asian
c. Belongs to the genus aphtovirus, family flaviviridae.
d. Is a small non-enveloped virus
e. Representative of the family picornaviridae.
f. Hosts: cloven hoofed animals and many wild ruminants.
g. Neuronal degeneration and perivascular guffing.
h. Carnivores are not natural susceptible.
i. Wild ungulates may spread virus.
T: a, d, e, f, h, i
F: b, c, g
Enterovirus:
a. Virus is very sensitive.
b. Swine vesicular disease virus.
c. Duck virus hepatitis.
d. Avian encephalomyelitis virus.
e. Primary replication: epithelium of the mucosa of the oropharynx, small intestine.
T: b, e
F: a, c, d
Viruses that cause viral hepatitis belong to next genera
a. Flaviviridae, Herpesviridae, Paramyxoviridae
b. Picornaviridae, Paramyxoviridae, Herpesviridae
c. Hepadnaviridae, Flaviridae, Picornaviridae
d. Herpesviridae, Picornaviridae, Hepadnaviridae
T: c
F: a, b, d
hepatitis: adenoviridae, deltavirus, flaviviridae, goose parvovirus, hepadnaviridae, hepeviridae, picornaviridae
Border disease virus:
a. Classified to the genus Flavivirus.
b. Replication in the lymphoid tissue.
c. Exist worldwide in pigs.
d. Can cross the placenta and cause abortion.
e. Excretors in the breeding stock can only be detected by virus isolation from seronegative animals.
T: d
F: a, b, c, e
Classical (european) swine fever virus-CSFV:
a. Genus Flavivirus.
b. Primary replication in the lymphocytes and macrophages of the tonsils.
c. No vaccines have been used.
d. Payer‘s patches are exensively affected.
e. Tertiary dissemination to the CNS.
T: b, e
F: a, c, d
genus pestivirus, 2 types of vaccines used
Genus Pestivirus includes the next viruses
a. Bovine viral diarrhoea virus
b. Vesicular exhantema virus of swine.
c. Classical swine fever virus
d. Border disease virus in sheep
T: a, c, d
F: b
16.Transmissible gastroenteritis virus-TGEV
a. Virus is transmitted slowly, incubation period 1-2 weeks.
b. Transmission by carrier animals, by ingestion of faecal materials, indirectly.
c. Disease is fatal to piglets under 1 week old.
d. Enterocytes of small intestine are destroyed.
e. TGEV is associated with nephritis.
T: b, c, d
F: a, e
Retroviruses:
a. The virus only survives for a few hours outside the host.
b. Some retroviruses produce tumors, particularly leukemias and sacromas.
c. Can spread by vertical transmission, not by horizontal transmission.
d. Icosahederal and helical components in their nucleocapsids.
e. Retroviruses differ from other RNA viruses in that they synthesize mRNA and replicate their genome by means of DNA intermediates.
T: a, b, e
F: c, d
Vaccines have been used against:
a. Bovine viral diarrhoea virus.
b. Equine influenza virus.
c. Vesivular exanthema virus of pigs.
d. Bovine parainfluenza virus 3.
e. Avian infectious bronchitis virus (IBV).
T: a, b, d, e
F: c
The following viruses are associated with chicken disease:
a. Parvoviridae.
b. Circovirus.
c. Adenoviridae.
d. Pestivirus.
e. gallid herpesvirus 1
T: b, c, e
F: a, d
