spreadsheet Flashcards
flaviviruses (virus types)
hep C; St louis encephalitis virus; west nile virus; yellow fever virus; dengue virus
flaviviruses (subclasses)
hepacivirus and arboviruses
arboviruses
st. louis encephalitis virus; west nile virus; yellow fever virus; dengue virus
arboviruses - enveloped?
enveloped
arboviruses - nucleic acid/structure
+ssRNA
arboviruses - virion structure
icosahedral
St. Louis encephalitis virus - transmission route
arthropods (mosquitoes; urban/rural habitat), wild/domestic birds
west nile virus - transmission route
arthropods (mosquitoes; urban/rural habitat), wild/domestic birds
dengue virus - transmission route
Aedes aegypti mosquito, humans
yellow fever virus - transmission route
humans, Aedes aegypti mosquito (jungle yellow fever can infect tree mosquito and monkeys…tree mosquito infects human, which then is bitten by Aedes aegypti)
st. louis encephalitis virus - diseases caused
encephalitis
west nile virus - diseases caused
encephalitis
yellow fever virus - diseases caused
yellow fever
dengue fever virus - diseases caused
Classical Dengue (“bone-break fever”), dengue hemorrhagic fever (fatal)
st. Louis encephalitis - general epidemiology
how long are the two incubation periods?
Are human’s dead end hosts?
requires multiplication in arthropod host (usually 2 incubation periods; intrinsic 7 days in humans; extrinsic 14 days in arthropod), humans are dead-end hosts b/c not high enough viremia
west nile virus - general epidemiology
How long are the two incubation periods?
Are humans dead end hosts?
requires multiplication in arthropod host (usually 2 incubation periods; intrinsic 7 days in humans; extrinsic 14 days in arthropod), humans are dead-end hosts b/c not high enough viremia
yellow fever virus - general epidemiology
Where is this virus endemic?
only in rural tropical Africa and South America
dengue fever virus - general epidemiology
Where is this virus endemic?
Are humans dead end hosts?
found in tropics/subtropics, esp in S.E. Asia and Caribbean islands, humans are not dead-end hosts
st. louis encephalitis - epidemiology
How old are the usual infected patients?
What percentage of cases are fatal?
Where is this virus endemic? Where is this virus found?
Generally infects adults over 50yo, 10% cases fatal (mostly in elderly), many subclinical infections, St Louis from N America, West Nile from N Africa and Middle East
west nile virus - epidemiology
What age are the infected patients?
What percentage of cases are fatal?
Where is this virus endemic? Where is this virus located?
Generally infects adults over 50yo, 10% cases fatal (mostly in elderly), many subclinical infections, St Louis from N America, West Nile from N Africa and Middle East
yellow fever virus - epidemiology
What is the mortality rate?
Are there ever subclinical infections?
High mortality, some subclinical infections
dengue virus - epidemiology
is this virus fatal?
how many subtypes of this virus exist?
severe but not usually life-threatening disease, 4 antigenic types
st. louis encephalitis virus - pathogenesis
how long is the incubation period?
Where does the virus first multiply during viremia?
What are the prodromal symptoms?
What are the full infection symptoms?
Encephalitis after 7 day incubation period, viremia from multiplication in vascular endothelium, prodromal febrile malaise followed by encephalitis with paralysis/coma/death
west nile virus - pathogenesis
Where does the virus first multiply during viremia?
What are the prodromal symptoms?
What are the full infection symptoms?
Encephalitis after 7 day incubation period, viremia from multiplication in vascular endothelium, prodromal febrile malaise followed by encephalitis with paralysis/coma/death