PQS - Reoviruses Flashcards
Orbiviruses spread by droplet (aerosol) infection
F
By vectors
Orbiviruses can be cultivated in vivo by inoculation of embryonated eggs
T
Genetic reassortments may cause significant antigenic changes in reovirus strains
T
Orbiviruses are serologically uniform
F
Orbiviruses are mainly arboviruses
T
Reoviruses are sensitive to lipid solvents and detergents
F
They are non-enveloped
Orthoreoviruses frequently cause tenosynovitis of horses
F
Avian orthoreovirus causes tenosynovitis in birds
Orthoreoviruses can cause pneumoenteritis in calves
T
Orthoreoviruses can cause pneumoenteritis in cattle.
T
Mainly in calves
Avian orthoreo –and rotaviruses can cause runting sunting syndrome in chickens.
T
Avian orthoreoviruses cause mainly nephritis and encephalitis
F
Causes: arthritis and synovitis
Infection of adult birds with orthoreoviruses usually remains subclinical
T
Avian orthoreoviruses usually transmitted by germinative route
F
Avian orthoreoviruses can cause damages in the bursa Fabricii
T
Mammalian orthoreoviruses can cause pneumoenteritis only in suckling animals
F
Colostral immunity protects the calf until 5 months
Orthoreovirus can cause tenosynovitis in pigs
F
In birds
Avian orthoreoviruses usually cause disease in adult birds
F
usually in chickens, but MIGHT cause in older birds = no clinical signs
Tenosynovitis is one of the most frequent manifestations of avian orthoreovirus infections
T
Trypsin-sensititive avian orthoreovirus usually cause respiratory disease in birds
T
Yolk immunity does not influence the efficacy of vaccination against avian orthoreovirus
F
Avian orthoreoviruses may cause necrotic foci in the visceral organs of birds
T
Avian orthoreoviruses can cause inapparent infection in poultry
T
Orthoreoviruses can be detected by haemagglutination test
T
Trypsin resistant strains of Avian orthoreoviruses frequently cause diarrhoea.
T
Trypsin sensitive strains of avian orthoreoviruses frequently cause tenosynovitis
T
Horses usually develop lethal hemorrhagic enteritis in Orthoreovirus infections
F
Coughing and nasal discharge, usually with bacterial co-infections
Infection of adult birds with Orthoreoviruses usually remains subclinical
T
Orthoreoviruses can cause encephalitis in cattle.
F
Avian orthoreoviruses can cause inapparent infections in poultry.
T
Avian orthoreoviruses can cause poult enteritis-mortality syndrome (PEMS)
T
Infectious tenosynovitis can be prevented by vaccination.
T
with both attenuated and inactivated
Avian orthoreoviruses infect only via inhalation and parenterally.
F
Per os as well
Parenteral transmission = the passage or transfer of potentially dangerous pathogens via a way other than through the digestive system
Avian orthoreoviruses only infect via PO infections.
F
Air-borne and transcutaneous infection too
All Avian orthoreoviruses can spread germinatively.
T
Helicopter disease causes feather problems
T
Orthoreovirus infections cause immunosuppression in birds
T
Tenosynovitis is a frequent sign of Avian Orthoreovirus infection.
T
Orthoreovirus mainly infects younger animals.
T
Orthoreovirus causes respiratory and GI disease.
T
Tenosynovitis is caused by only one Orthoreovirus.
F
Orthoreoviruses frequently cause tenosynovitis of horses.
F
Rotaviruses are sensitive to environmental conditions
F
Orbiviruses are sensitive in the environment
Rotavirus infection is sporadic within the herd
F
Rotavirus only infects mammals
F
Human, Birds, swine
Clinical signs of rotavirus infection are usually seen in animals older than 2 weeks of age
F
Seen in 1 week of age, sometimes 2 weeks of age
Swine is not susceptible to rotavirus infection
F
Rotaviruses predispose to E.Coli infection in suckling piglets
T
Rotaviruses are shed in the faeces in high titres
T
Rotavirus infection results in high mortality
F
Only if there are other infections present, it can be fatal
Avian rotaviruses are transmitted by germinative infection
F
The virus is present on the surface of the eggs
Losses due to rotavirus infection of young animals can be prevented by colostrum feeding
T
Rotaviruses usually cause enteritis in young (1-2 weeks old) animals
T
Clinical signs of rotavirus infection are usually seen in animals older than 2 weeks of age
F
Seen in 1-2 weeks old animals
Rotaviruses damage the mucosa of the large intestines
F
The small intestine is affected
Rotaviruses are serologically uniform
F
Rotaviruses are typically transmitted via the faecal oral route
T
Swine rotavirus infection is frequently followed by E. coli secondary infection in piglets.
T
Avian rotaviruses can cause tenosynovitis.
F
Avian orthoREOvirus
Rotaviral enteritis of calves can be prevented by immunization of pregnant cows
T
Rotaviruses can cause chronic enteritis and persistent infection.
F
Rotaviruses cause mainly respiratory signs in cattle.
F
Rotaviruses mainly cause respiratory disease in older animals.
F
Rotaviruses typically cause respiratory disease in 3-6 month old calves.
F
1-2 weeks of age
Rotavirus is species specific.
T
Rotaviruses frequently cause tenosynovitis in birds.
F
Vaccination of horses in the Americas is used to prevent rotavirus infections
F
?? True in studysmarter
Vaccination of COWS in 3rd trimester
