CIRCOVIRUS Flashcards
The reproduction of the circovirus continuous in the dividing cells.
T
The circovirus is too small so it’s a bad antigen
F
The circovirus is a good antigen
T
Circovirus infections are immune suppressive
T
Circovirus can easily be cultured in different homologous cell lines.
F
Resistance of circovirus is very low, in the environment they are inactivated within a day.
F
Circoviruses can be cultured easily in many cell lines.
F
The resistance of Circoviruses is high, they remain infectious in the environment for several
months.
T
Causes generalized lymphoid depletion.
T
Only causes the depletion of B-lymphocytes
F(lymphoid depletion in PMWS)
Canine circoviruses are present worldwide.
F
Circovirus are very resistant viruses
T
The circovirus has circular RNA in its genome.
F(circular ssDNA)
Swine circovirus causes lesions in multiple organs and strong immunosuppression.
T
Porcine circovirus can be transmitted by mice and rats.
T
Porcine circovirus vaccines are available both for sows and for piglets.
T
Detection of PCV2’s DNA is enough for the correct diagnosis.
F
Four species of swine circovirus were described.
T
The porcine circovirus 2 is proven to be immunosuppressive.
T
PCV2 detection in foetal myocardium is pathognomic value.
T
Porcine circovirus replicates in the myocardium of the foetus
T
In pigs the porcine circovirus 2 can cause BFD.
F( PNWS, PDNS, reproductive disorders, PRSD)
The porcine circovirus can replicate in the foetus.
T
The clinical signs, pathological and histopathological examination suggest PCV2 induced disease
T
PCV2 can cause respiratory signs
T
The primer replication of PCV2 is in lymphoid tissues of the throat
T
PCV2 infection does not always cause clinical signs
T
Porcine circovirus 2 always causes clinical signs in pigs
F
Porcine circovirus 2 always causes clinical signs in cattle
F
There is no efficient vaccine against PCV2
F (inactivated, complete virus)
The porcine circovirus can replicate in the foetus
T
Circovirus in pigs can be Subclinical.
T
Porcine circoviruses are responsible for a variety of clinical conditions
T
Porcine circoviruses cannot be responsible for reproductive disorders
F
Porcine circoviruses are present worldwide
T
Porcine circoviruses cause severe haemorrhagic diseases in pigs
T
Porcine circoviruses are genetically and antigenically uniform
F
Porcine circoviruses may cause a variety of diseases.
T
For prevention of Swine circovirus disease only general hygienic measures can be used
F (Inactivated, complete virus)
Swine circovirus can cause retarded growth and strong immunosuppression.
T
For prevention of swine circovirus disease, inactivated vaccine is available.
T
Swine circovirus caused disease occurs worldwide, it is frequent
T
Swine circovirus may be shed in excretions for several months after recovery.
T
Swine circovirus causes only respiratory signs
F
The incubation period of Porcine circovirus caused disease is about 2-4 weeks
T
For prevention of Porcine circovirus disease vaccines are available.
T
Porcine circovirus-2 causes clinical signs mainly after weaning.
T
Incubation period of porcine circovirus disease is short, some days
F
Predisposing factors for Porcine Circovirus associated disease can be: Vaccines. The virus variant. Virus strain
T
Predisposing factors for Porcine Circovirus associated disease can be Food management.
F
PCV2 can cause: Enteric disorders. Disorders in the nervous system. Respiratory disease.
Reproductions disorders
T
Porcine circovirus-1 may damage the foetus.
F
Porcine circoviruses cannot be responsible for reproductive disorders
F
Porcine circoviruses replicate in the heart of the foetus
T
Porcine circovirus may cause inapparent infections.
T
Circovirus can be responsible for the Porcine Respiratory Disease Complex.
T
Circovirus cause skin lesions in swine
T
Reproductive disorders caused by Porcine circoviruses are only significant in North
America
F
A clinical sign of PMWS can be a progressive weight loss.
T(weightloss, jaundice, rough hair)
PMWS is a type 3 hypersensitivity
F (pdns)
One of the most common pathological signs of PMWS is glomerulonephritis
F (PDNS)
PMWS is a type 4 hypersensitivity
F
Typical pathological finding of PMWS is pneumonia
T
PDNS is an allergic disease.
F
Typical pathological finding of PMWS is enlarged mesenteric lymph nodes
T ( also inguinal)
A clinical sign of PMWS can be haemorrhages in the skin
F ( haemorrhages in the LN)
In pigs the porcine circovirus 1 can cause PMWS.
F
In pigs the porcine circovirus 2 can cause PDNS
T
One of the most common pathological signs of PDNS is glomerulonephritis.
T
The appearance of PDNS is related to the good antigenicity of PCV2
T
PDNS is a type III hypersensitivity
T
PDNS may develop without porcine circovirus 2
T
PDNS is a type IV hypersensitivity
F
Porcine dermatitis and nephropathy syndrome are only caused by PCV-2
F (PCV-3, PCV-2)
One of the most common clinical signs of PDNS is multifocal circular red skin disease
T
PDNS disease is an immunocomplex disease
T
PDNS pathology is enlarged brown-greyish kidney, with haemorrhages
T
PDNS does not occur in Hungary
F
PDNS occurs primarily in the weeks following the selection/weaning.
T
A clinical sign of PDNS can be haemorrhages in the skin
T
PDNS is not caused by PCV
F(pcv2/3)
PDNS is caused by both PCV-1 and PCV-2.
F
PDNS is not caused by PCV
F
PDNS has been widespread in Hungary in Hungary since 1998
T
PDNS is a rare infection causing clinical signs only in piglets before weaning.
F
Prevention of PDNS is with live attenuated vaccines.
F (Inactivated, complete virus)
Regarding PDNS, general preventative rules and recently inactivated or vector vaccination can be used.
T
In pigs the porcine circovirus 2 can cause BFD
F
Avian circovirus causes clinical signs similar to those seen in PMWS.
T
Avian circovirus causes clinical signs similar to those seen in PDNS.
F (similar to PMWS)
The pigeon circovirus is not an important disease because the virus causes feather and beak deformities
F
The beak and feather diseases causes typically neurological signs
F
In parrots porcine circovirus 2 causes the psittacine beak and feather disease
F
The beak and feather disease can be acute problem
T
Feather and beak deformities may appear after circovirus infection of geese and pigeons
T
Beak and feather disease lesions are sometimes obvious only after molting
T
Avian circovirus infections result high morbidity and low mortality.
T
Pigeon circoviruses are antigenically uniform
F
Pigeon circoviruses frequently appear in diseases together with other viruses and bacteria.
T
Circovirus in geese and ducks can cause retarded growth and feather formation disturbances
T
Avian circoviruses do not cause clinical signs in domestic birds.
F
In ducks and geese, Avian circoviruses can cause retarded growth and immunosuppression
T
Avian circoviruses can spread via breeder eggs
T
Avian circoviruses do not cause disease in wild birds.
F
Avian circoviruses are species specific.
T
Avian circoviruses can infect many poultry species.
T
Avian circoviruses can cause retarded growth and immunosuppressio
T
Inactivated vaccines are used against pigeon circovirus infections.
F
Pigeon circovirus infections do not occur in Hungary, the disease is prevented by
vaccination.
F
Circoviruses can infect pigeons
T
Vaccines are available for Pigeon Circoviruses.
F
Clinical signs of PBFDV (Psittacine Beak and Feather Disease Virus) are only seen at time of moulting.
F
The chicken infectious anaemia virus is also commonly detected in goose.
F (only chicken!)
Anaemia and haemorrhages are two important clinical signs of chicken anaemia.
T
The chicken infectious anaemia is a chicken disease up to 1 month of age
T
The chicken infectious anaemia virus causes only anaemia
F
The chicken anaemia virus does not replicate in lymphoid progenitors
F
There are vaccines available against chicken anaemia
T
The chicken infectious anaemia is a disease of hens
F
The chicken infectious anaemia causes clinical signs similar to those seen in PDNS
F
Vertical infectious is not possible in chicken infectious anaemia
F (horizontal and vertical is possible)
Infection of day old chickens with the chicken anaemia virus leads to immune suppression
T
Chicken anaemia virus is transmitted both horizontally and vertically.
T
Atrophy of the thymus is a post mortem finding of Chicken Infectious Anaemia virus.
T
Infectious Chicken anaemia virus can cause clinical signs only in layer hens.
F
Infectious chicken anaemia virus causes clinical signs in chicken of 1 to 4 weeks of age.
T
For prevention of infectious chicken anaemia, live attenuated vaccine is available.
T
Infection of day-old chickens with the chicken anaemia virus leads to immune suppression.
T
Chicken anaemia virus infection can result in high mortality of chickens over 3 weeks of age.
F
In Chicken Infectious anaemia, most symptoms are observed in the first month.
T
Chicken Infectious anaemia involves destruction of the lymphoid and myeloid cells.
T
Chicken Infectious anaemia virus induces apoptosis of activated T-cells.
T
Pigeons can be infected by Chicken Infectious anaemia virus.
F
Chicken Infectious anaemia virus does not replicate in the thymus.
F
Chicken Infectious anaemia in day old chickens causes a long-lasting
immunosuppression.
T
Chicken Infectious anaemia virus is a Gyrovirus
T
Chicken anaemia virus infection can cause death of chickens below 3 weeks of age.
T
