Retrovirus (IKKE FERDIG) Flashcards
Retroviruses are frequently carried lifelong
T
Retroviruses carry an integrase enzyme
T
Malignant transformation of host cells is a typical effect of several retroviruses
T
Retroviruses are enveloped, their resistance is low
T
The reverse transcriptase transforms DNA of the retroviruses to mRNA
F
Retroviruses are stable viruses; genetic changes are rare
F
Retroviruses are euryxemic agents
F
Retroviruses are frequently carried lifelong
T
Retroviruses are generally host specific viruses
T
Mutation of retroviruses is very rare
F
Immunosuppression is a typical effect of several retroviruses
T
Retroviruses can integrate into the genome of host cells
T
Reverse transcriptase is an important enzyme of retroviruses.
T
Retroviruses results in lifelong infection.
T
Retroviruses replicate mainly in the endothelial cells.
F
Several retroviruses can cause malignant transformation in the hosts
T
Retroviruses are generally species specific
T
Retroviruses are generally resistant, they can survive in the environment for several weeks
F
Retroviruses frequently cause permanent infection
T
Retroviruses are generally stable viruses, mutations are very rare
F
Retrovirus has weak resistance
T
Retrovirus has a wide host spectrum
F
Retrovirus has a good immunogenicity
T
Retrovirus infection is long-lasting
T
Retroviruses show high host specificity
T
Retroviruses are generally not carried for more than a month
F
Retroviruses generally cannot survive in the environment for a long time
T
Retroviruses are enveloped viruses
T
Retroviruses transcribe their nucleic acid to DNA
T
Frequent genetic changes of retroviruses are common
T
Retroviruses carry reverse transcriptase enzyme
T
Retroviruses generally cause long, frequently life-long infection
T
Retroviruses are generally genetically very stable.
F
The resistance of retroviruses is generally good, they survive in the environment well.
F
Reverse transcriptase is produced by retroviruses
T
The nucleic acid of retroviruses can be integrated into the genome of the host cell.
T
Retroviruses frequently cause immune suppression
T
Retroviruses are enveloped viruses
T
The host range of retroviruses is generally narrow
T
Reverse transcriptase converts RNA of retroviruses into DNA
T
Retroviruses are generally very stable viruses, mutations are exceptional in them.
F
Retroviruses are generally shed in infected lymphoid cells
T
Certain retroviruses can cause proliferation of the lymphoid cells
T
Retroviruses spread with infected lymphocytes
T
Retroviruses have a tegument or rind
F
You cannot multiply retrovirus artificially
F
Retroviruses can incorporate into the genome
T
Retroviruses cannot spread from animal to animal.
F
Retroviruses are widely distributed in Hungary
T
Retroviruses replicate mainly in endothelium cell
F
Retrovirus can replicate without helper retroviruses.
T
Retroviruses can integrate the cellular genome
T
The resistance of retroviruses is low, they cannot survive in the environment for a long time.
T
Retroviruses are generally good antigens.
T
Retroviruses have own metabolic enzymes
T
Antibodies against enzootic bovine leukosis virus can be detected 1-4 months after infection.
T
Antibodies against enzootic bovine leukosis virus can be detected only for 1-2 months after
infection
F
Maternal Antibodies against enzootic bovine leukosis virus can be detected only for 1-2
months
F
Lymphosarcoma can be seen postmortem in the case of enzootic bovine leukosis
T
Generation shift is the only way of eradication of enzootic bovine leukosis
F
Enzootic bovine leukosis virus does not spread from animal to animal.
F
Mild clinical signs can be seen in the incubation phase of enzootic bovine leukosis
F
Enzootic bovine leukosis virus is not shed in the colostrum
F
Enzootic bovine leukosis virus can be transmitted with blood
T
Enzootic bovine leukosis virus can spread from cattle to sheep, goats , and other ruminants
F
Enzootic bovine leukosis virus has uniform antigenic structure
T
In the case of Enzootic bovine leukosis the clinical signs appear at the age of 6-8 month
F
Enzootic bovine leukosis is carried lifelong
T
Enzootic bovine leukosis virus can be transmitted in tracheal discharge
T
Enzootic bovine leukosis occurs only in Holstein Friesian cattles
F
Enzootic bovine leukosis virus can infect foetuses of pregnant animals
T
Enzootic bovine leukosis virus has several serotypes and subtypes.
F
Enzootic bovine leukosis can spread by air within the herd
T
Enzootic bovine leukosis can spread by the veterinarian
T
Enzootic bovine leukosis virus cannot result tumour formation
F
Serological examinations cannot be used to the diagnosis of enzootic bovine leukosis
F
Immune tolerance can happen in the case of enzootic bovine leukosis
T
Selection cannot be used for eradication of enzootic bovine
F
Bovine enzootic leukosis infect only bovine
F
Bovine enzootic leukosis does not spread with excretion
F
Bovine enzootic leukosis spreads slow in the herd.
T
Bovine enzootic leukosis can be transmitted by blood
T
Bovine leukosis virus can give lifelong carriers.
T
Bovine leukosis virus causes seropositivity in latency period.
T
Enzootic bovine leukosis the pre-tumour phase usually in 6-10 months old animals
F
Enzootic bovine leukosis during pre-tumour phase causes lymphocytosis
T
Bovine enzootic leukosis virus can be transmitted with lymphoid cells
T
Iatrogenic infection is frequent in the epidemiology of bovine enzootic leukosis
T
The target cells of the bovine enzootic leukosis virus are the T-lymphocytes
F
The typical signs of bovine enzootic leukosis can be seen in cattle under 1 year of age
F
Antibodies against enzootic bovine leukosis virus can be detected in the ELISA test
T
Antibodies against enzootic bovine leukosis virus can be detected in the milk
T
Selection (test and slaughter) method cannot be used to eradicate enzootic bovine leukosis
virus
F
Generation shift method cannot be used to eradicate enzootic bovine leukosis virus
F
Enzootic bovine leukosis virus is spreading horizontally in a cattle herd
T
Enzootic bovine leukosis virus cannot infect foetuses
F
Enzootic bovine leukosis virus is passed to newborn calves mainly with colostrum in
endemically infected herds.
F
By the end of the incubation phase the animals become seropositive leukosis virus
T
Tumours can be seen in about 90% of the animals infected with enzootic bovine leukosis
virus
F
Antibodies in the milk against enzootic bovine leukosis virus can be detected with ELISA
T
Tumours caused by enzootic leukosis virus generally appear at the age of 6 months
F
The infection with enzootic leukosis virus is detected by AGP and ELISA
T
Enzootic bovine leukosis virus is zoonotic
F
Enzootic bovine leukosis virus is shed in lymphoid cells
T
Enzootic bovine leukosis virus cannot cause intrauterine infection
F
Enzootic bovine leukosis virus is spreading slowly in the herd.
T
The target cells of enzootic bovine leukosis virus are the B lymphocytes
T
Enzootic bovine leukosis virus is not shed by the infected animals
F
Enzootic bovine leukosis virus can be transmitted with organic infection.
T
Enzootic bovine leukosis virus can be transmitted with per os infection.
T
Clinical signs of enzootic bovine leukosis are seen mainly in 6-8-month-old calves
F
Enzootic bovine leukosis virus has several serotypes and subtypes
F
Enzootic bovine leukosis can spread by air within the herd
T
Enzootic bovine leukosis virus can not result in tumour formation.
F
Immune tolerance can happen in the case of enzootic bovine leucosis
T
During incubation phase of bovine enzootic leucosis the animal become seropositive.
T
The tumours in the case of bovine enzootic leucosis can be seen from the age of 6 months.
F
PCR is used for the detection of bovine enzootic leucosis in immunotolerant calves
T
Bovine enzootic leucosis can be eradicated with selection
T
Bovine enzootic leucosis virus has several serotypes
F
There is no horizontal spread in the case of bovine enzootic leucosis.
F
There is genetic predisposition in the case of bovine enzootic leucosis
T
Enzootic bovine leucosis occurs in all ruminant species.
F
Enzootic bovine leukosis virus can infect cattle, pigs and horses.
F
Iatrogenic infection can be important in the transmission of enzootic bovine leukosis virus.
T
Aerogenic infection occurs in the case of enzootic bovine leukosis virus
T
Enzootic bovine leucosis is spreading very fast in infected herd
F
Enzootic bovine leucosis virus can infect the foetus
T
Enzootic bovine leucosis only infects cattle
F
Enzootic bovine leukosis occurs only in Holstein-Frisian cattle, other cattle races are resistant
F
Enzootic bovine leukosis has low resistance; it cannot retain its infectivity for a long time in
environment
T
The most severe clinical signs of ovine pulmonary adenomatosis can be seen in lambs
younger than 6 months.
F
Antibodies of animals infected with ovine pulmonary adenomatosis virus can be detected
with ELISA.
F
Adenocarcinoma can be seen postmortem in the case of ovine pulmonary adenomatosis
T
Ovine pulmonary adenomatosis virus is transmitted with tracheal discharge
T
Ovine pulmonary adenomatosis virus can be transmitted with contaminated objects to other farms
F
Ovine pulmonary adenomatosis virus can infect sheep, goats, and cattle
F
The most severe clinical signs of ovine pulmonary adenomatosis can be seen in lambs
younger than 6 months
F
Shedding large amount of nasal discharge is a typical clinical sign of ovine pulmonary
adenomatosis
T
Ovine pulmonary adenomatosis virus replicates in lymphoid cells and causes viraemia
F