RNA Viruses Togaviruses, Bunyaviruses, Flaviviruses And Other RNA Viruses

Question 1

What are the subtypes of Arboviruses

Answer 1

1- Ss + RNA = Togavirus, Flavivirus
2-Ss - RNA= Bunyavirus, Rhabdoviruses, Orthomyxovirus
3- ds RNA= reovirus

Question 2

What are the vectors of Arthropods

Answer 2

Mosquitos
Ticks
Sandflies

Question 3

Mosquitos cause which diseases

Answer 3

Japanese encephalitis
Dengue
Yellow fever
St. Louis encephalitis
EEE
WNF
VEE

Question 4

Ticks cause which diseases?

Answer 4

Crimean- Congo hemorrhagic fever
Various tick-borne encephalitides

Question 5

Sandflies causes which diseases?

Answer 5

Sicilian sandfly fever
Rift Valley fever

Question 6

What are the main animal reservoirs

Answer 6

Birds— Japanese encephalitis, St. Louis encephalitis, EEE, WEE
Pigs — Japanese encephalitis
Monkeys — Yellow fever
Rodents — VEE, Russian Spring-Summer encephalitis

Question 7

Generas of Togaviruses

Answer 7

Alpha virus
Rubivirus

Question 8

Alpha viruses cause which diseases

Answer 8

Eastern equine encephalitis
Westerns equine encephalitis
Venezuelan equine encephalitis
Chikungunya
O’ yong-nyung
Mayaro
Ross River
Sindbis

Question 9

Features of Rubivirus

Answer 9

Rubella virus
One serotype
Occurs through aerosolized respiratory secretions
Pat,ents are contagious 2 to 5 days before rash
Incubation : 14-21 days

Question 10

Which diseases does Rubivirus causes

Answer 10

Lymphadenopathy
Rash
Fetal abnormalities— dangerous for Pregnant women

Question 11

Rubella rash characteristics

Answer 11

Erythematous and maculopapular lesions
Starts on the face and spreads
Last for 3 days

Question 12

Diagnosis of Rubella virus

Answer 12

IgM ab measuring

Question 13

Congenital Rubella Syndrome

Answer 13

Occurs when a non-immune mother is infected in the first trimester of pregnancy
Rubella vaccine should not be given during pregnancy

Question 14

Bunyasvirus causes which diseases

Answer 14

Rift Valley fever
Sandfly fever
Crimean-Congo haemorrhagic fever

Question 15

Features of Crimean-Congo Haemorrhagic fever

Answer 15

Tick-borne virus
Distributed throughout the world
Reservoir and vector= The Hyalomma tick Ixodid ticks
Transmission: infected animal blood or ticks, person to person.
Symptoms: Red eyes, a flushed face, a red throat and petechiae on the palate, large areas of severe bruising, severe nosebleeds and uncontrolled bleeding
Diagnosis: serological test result

Question 16

Diseases of Flavivirus

Answer 16

Dengue 1,2,3,4
Yellow fever
West Nile fever
St.Louis encephalitis
Japanese encephalitis

Question 17

Features of Dengue

Answer 17

High fever, lymphadenopathy,myalgia,bone and joint pains,headache and a maculopapular rash
Hemorrhagic fever and shock

Question 18

Features of West Nile

Answer 18

Infects: human,bird,mosquitoes, horses and other mammals
Develop severe illness with neurological component— Encephalitis
Muscle weaknesss to flaccid paralysis of extremities