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