4-1 Orthomyxo Flashcards
Subtypes are dt antigenic variations of surface glycoproteins
HA
NA
Antigenically stable
Type C
LRTI caused by?
Abc
Rsv
Parainfluenza
Proteins of ortho
9 sp
1nsp
CAuses highly infectious viral illness
Orthomyxo
Found in mosquitoes, ticks, and banded mongoose
Thogotovirus
7 segments?
C
Enveloped?
Yes
For Release of virus
Neuraminidase
For Core receptor
Nucleoprotein
Protein For attachment
Hemaglutinin
For regulation of mrna splicing
Ns1 ns2
Antiviral drugs target what?
M2 protein
Target of neutralizing antibodies
Hemagglutinin
Ha causes antigenic changes of what?
Minor drift
Major shift
Describe the receptor for HA
Trisaccharide of sialic, gal, glu
Neuraminidase is important in determination of what?
Subtypes!
THGSY is?
Standard nomenclature
Human and animal strains
A
Human and swine
C
Ha has ? Subtypes?
15
Hiw many subtypes of ha and na recovered in humans
4ha
2 na
H5n1?
Chickens to humans
Shift or drift?
New subtype
Minor
Pandemic
Shift
Drift
Shift
Transmission
Inhalation
Survives what?
Slow drying Dust 4c Seawater -70c
Systemic sx?
Dt interferon and lymphokines
Local sx?
Cilia and mucus secreting cells
Important for future protection against infection
Antibody
Important cause of croup in children Under 1yo
A
Gastric flu. Type?
B
Afebrile urti. Type?
C
Croup is associated with what sx?
Otitis media
Lung complications?
PRimary inf pneumonia
Bacterial pneumonia
Cardiac involvment
Neuro (GBS, reyes, enceph)
Sequelae that Affects 2-6yo?
Reyes
Reyes manifestations
hHiME Hepato Hypogly Mental stat Inclease bloood ammonia Enceph
Immunity important?
IgA IgG
Celular immunity
Antibodies to this is the only way to be protective
Ha and na, others are not
T or f? No cross protection to the types?
T
Samples best Obtained at what time?
3 days after onset
Detects hemadsorbing virus
Hemadsorption
Detects virus antigens
Hsf elisa
M2 ion channel inhibitors
Rimantidine
Ineffective against b and c
A..amantadine