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Microbiology 7
Step 1 Review: RNA viruses 2
103
Biology
Graduate
12/26/2007

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Term
Give the make up of Mump (Paramyxoviridae Rubulavirus).  What other virus shares it
Definition

1.  (-) ssRNA nonsegmented

2.  Helical nucleocapsid

3.  Enveloped 

 

1.  Measles

2.  RSV

3.  Parainfluenzae 

Term
Give the symptoms of mumps
Definition

1.  Neck, ear pain

2.  Loss of appetite

3.  Tiredness

4.  Fever & headache

5.  Swelling of the cheeks (parotid) & jaw 

Term
Orchitis is a complication of
Definition
Mumps
Term
what is orchitis?  Which infection is it assocaited w/
Definition

Swelling of the testes (bilateral or unilateral)

Mumps 

Term
Give the most common complication of mumps
Definition
Meningocephalitis
Term
Give the symptoms of meningocephalitis caused by mumps
Definition

1.  Fever

2.  Headache

3.  Vomiting

4.  Irritability & confusion

5.  Stiff neck 

Term
In what age groups are you more likely to find mumps
Definition
5-15 yr olds
Term
What seasons would you most likely to find mumps
Definition
late winter & early spring
Term
When does the mump virus shed?
Definition
1 to 2 days prior to onset of symptoms
Term
Mumps infects the ______ _____ first, spreads to the  _____ & local ______ _____ and spreads to _____ & distant _____ ____
Definition

Respiratory tract

 Glands

lymph nodes

spleen

lymph nodes 

Term
What's the vaccine for mumps called
Definition
M M & R
Term
You give the mumps vaccine at infants age _____ and the second dose is recommended at ____
Definition

12-15 months

4-6 years of age 

Term
Who should not get the mumps vaccine.  What should they get instead
Definition

Immunosuppressed

Immune serum globulin 

Term
Give the make up for Measles virus
Definition

1.  (-) ssRNA nonsegmented

2.  Helical nucleocapsid

3.  enveloped 

Term
What's the symptoms of the prodromal stage of measles virus
Definition

1.  Fever

2.  Runny nose

3.  Cough

4.  Red water eyes

5.  Sensitivity t light 

Term
What are Koplik spots
Definition
Caused by the measles virus, they are lesions found on the roof of the mouth
Term
Describe the maculopapular rash of measles.  Where does it begin?  Where does it spread to
Definition
Begins on the face and spreads to the trunk, ab and arms/legs
Term
What is the major complication of the measles followling one week after the rash appears
Definition
Acute postinfectious encephalitis
Term
what the 5 most common pediatric disease w/ a rash
Definition

1.  Measles

2.  Rubella

3.  Scarlet fever

4.  Roseola (HHV6)

Erythema infectiosum (Parvovirus B19) 

Term
Give the make up of Rubella Virus
Definition

1.  (+) ssRNA nonsegmented

2.  Enveloped

 

Term
what are the symptoms of Rubella?  What glands get swollen?
Definition

1.  Fever for 24 hrs

2.  Erythematous macropular rash

3.  Cervical lymph nodes (back of the neck) 

Term
What's the greatest danger from rubella? 
Definition
unborn babies, there is a chance of birth defect and miscarriage
Term
What's the common manifestation from congenital rubella syndrome
Definition
1.  Deafness
Term
When are rubella infections highest?  What season
Definition
Winter and spring
Term
For how many days does the Rubella virus shed for?
Definition
7 before the appearance of the rash and 7 after the appearance of the rash
Term
Give the make up of Lyssavirus (Rabies)
Definition

1.  (-) ssRNA virus

 2.  Helical nucleocapsid

3.  Enveloped 

Term
There are 4 stages to a rabies infection, name them
Definition

1.  Parplegia stage

2.  Encephalitis period 

3.  Furious stage

4.  Paralytic stage 

Term
In paraplegia stage, the virus infects peripheral nerves & tranvels to the CNS, give the symptoms that presents
Definition

1.  Tinging & prikcing at the site of the bite

2.  Numbing & loss of motor control 

Term
In the Encephalitis period, where does the rabie virus infect
Definition
Cerebellum, limbic or hippocampus
Term
What are the symptoms of the Encephalitis period of rabies
Definition

1.  Fever

2.  Terror

3.  Excitement

4.  Aggression

5.  Coordinate problem 

Term
Give the classic signs of furious stage
Definition

1.  Foaming at the mouth

2.  Brainstem destruction leading to coma & death 

Term
What's the gold standard for diagnosis Rabies
Definition
Stain for Negri bodies
Term
describe the Eclipse period of Rabies
Definition

1.  Replicating (1 mn to 1 year)

2.  Find Negri bodies

3.  Hasn't made the jump to CNS 

Term
When would you find negri bodies in a rabies infection
Definition
Eclipse period (replicating)
Term
When can you give a rabies vaccine to prevent the disease
Definition
Eclipse period
Term
What's the treatment for Rabies
Definition

Rabies vaccine

"Human dipolid cell" 

Term
Name the 6 Arboviruses
Definition

1.  West Nile

2.  California

3.  St. Louis, Western & Eastern equine

4.  Colorado tick fever 

5.  Dengue "breakbone fever"

 6.  Yellow fever

Term
Arbovirses have a ____ & a ______ where the virus repliacts & is transmitted back into the host
Definition

Host

vector 

Term
How is West nile transmitted
Definition
Mosquitos
Term
_____ _____ _____ causes the most common viral encephalitis
Definition
West Nile Virus
Term
What are the symptoms of west nile
Definition

1.  Fever, chills

2.  Vomit

3.  Headache

4.  Profound muscle weakness 

Term
What is the second most common cause of viral encephalitis
Definition
California Encephalitis Virus
Term
Who is most at risk for California Encelphalitis virus
Definition
Young children
Term
What are the signs of California encephalitis virus
Definition

1.  Heachache

2.  Vomiting

3.  Focal neurological signs 

Term
This is the only arbo virus transmitted by tick
Definition
Coloraldo tick virus
Term
What are the symptoms of Colorado tick virus
Definition

1.  fever

2.  Rash

3.  Muscle aches 

Term
What kind of profile does Colorado tick virus have
Definition

1.  dsRNA segmented

2.  Icosahedral

3.  Nonenveloped 

Term
What's the make up of California encephalitis
Definition

1.  (-) ssRNA segmented

2.  Helical nucleocapsid

3.  Enveloped 

Term
What's the most common arboviral infection in the world
Definition
Dengue
Term
How does Flavivirus (dengue) cause backbone fever
Definition

1.  macrophages cause inflammation

2.  Pryogen and pain mediators released

3.  Breakbone fever 

Term
What are the hallmark of dengue fever
Definition
Extreme muscle & joint pain of the extremities
Term
How do you get Dengue Haemoorhagic fever?
Definition

1.  Second infection by different serotype of Dengue

2.  Increase of anti-bodies to first serotype

3.  Cross-react to form immune complex

4.  type III hypersentivity 

Term
What's the make up of Hanta virus?  Which other virus shares it
Definition

1.  (-) ssRNA segmented

2.  helical nucleocapsid

 

California Encephalitis Virus 

Term
What's the host for hanta virus
Definition
Mouse
Term
Hows hanta virus transmitted
Definition
Breath in urine & feces of carrier mice
Term
What are the symptoms of the first few days of a hanta virus infection
Definition
1.  Malaise fever
Term
What's the symptoms of a hanta virus infection
Definition

1.  Malaise & fever

2.  anoxeria, nausea & vomiint (2 weeks)

3.  Cardiopulmonary, GI bleeding & low platelet 

Term
What's the make up of Arenavirus
Definition

1.  (-) ssRNA  nonsegmented

2.  Helical nucleocapsid

3.  Enveloped 

Term
What does Arenavirus (Lassa virus) cause?
Definition
Lymphocytic choriomeningitis
Term
In who are you most likely to see Lymphocytic choriomeningitis
Definition
Children exposed to mouse urine feces
Term
What are the symptoms of Lymphocytic choriomeningitis
Definition

1.  Fever

2.  Multi-organ failure & death 

Term
what are the symptoms of Lassa fever?  What organism causes it
Definition

1.  Hemorrhagic fever

2.  Arenavirus "lassa virus) 

Term
Filovirus can cause _____ & _____
Definition
Ebola & Marburg
Term
What are the symptoms of Filovirus
Definition

1.  Hemorrhagic fever

2.  Bleed from every orifice 

Term
HIV primary target is ____
Definition
CD4+ T cells
Term
What are the consequences of decrease CD4 T cell as a result of HIV infection
Definition

1.  Decreased CD8 T cell proliferation

2.  Decrease macrophage function due to reduce INF gamma 

Term
why does HIV accumulate mutations
Definition
Lack of proof reading
Term
Name the 4 methods of genetic variation of HIV
Definition

1.  Reverse transcriptase

2.  Strand switching

3.  Recombination

4.  Transcription of proviral DNA by RNA poly II 

Term
What's the mechanism of strand switching
Definition

1.  RT starts synthesizing DNA

2.  RT can jump to the other strand & continue synthesis DNA 

Term
How does transcription of proviral DNA by RNA poly II cause mutations
Definition
RNA poly II makes a new polymerase after integrating into host DNA
Term
What's the consequences of Genetic variation for HIV
Definition

1.  Phenotypic switch

2.  HAART

3.  Immune escape from CTLs

4.  Vaccine development difficult 

Term
Give an example of phenotypic switch for HIV
Definition
Monocyte tropsim (CCR5) to T-lymphocytes tropism (CXCR4)
Term
Name the 7 major genes in HIV
Definition

1.  gag gene

2.  pol gene

3.  env gene

4.  tat gene

5. Rev gene

6.  Nef gene

7.  Vif gene 

Term
The gag gene encodes for
Definition

1.  p24 (capsid)

2.  MA protein (Matrix) 

Term
The pol gene codes for
Definition

1.  Protease

2.  Integrase

3.  Reverse transcriptase 

Term
reverse transcriptase in HIV has ___ _______ activity & _____ _ activity
Definition
DNA polymerase & RNase H
Term
What's the function of Protease in HIV
Definition
Cleaves gag to MA, NP & CA
Term
What does integrase do?
Definition

1.  Integrates retroviral DNA into host

2.  Contains endonuclease activity 

Term
env gene codes for
Definition

1.  Envelope glycoprotein 120 (SU)

2.  glycoprotein 41 (TM) 

Term
the products of the env gene __ is located on the surface and __ is transmembrane
Definition

1.  SU

2.  TM 

Term
Tat is the product of tat gene and allows ______ _____ to synthesize fully
Definition
transcription complexes
Term
Tat binds to ___ w/ cyclin T subunit of ___ which phosphorylation of the large subunit of ___ ____ __
Definition

TAR

Tak

RNA poly II 

Term
Rev protein is a ___ _____ ______ that binds to ___
Definition

RNA binding protein

RRE 

Term
Rev protein activates _____ _____ of any RRE containing RNA
Definition
nuclear export
Term
Nef gene is translated from multiple sliced _____ _____
Definition
early transcripts
Term
In the adsorption phase of HIV viral gp120 binds to _____ ______ ____ & gp41 binds to either _____ or _____
Definition

CD 4 T-Helper cells

CCRS or CXCR4 

Term
CXCR4 is present on _____
Definition
T cells
Term
How does HIV replicate
Definition

1.  RT makes cDNA and then degrades RNA & synthesizes DNA complementary strand

2.  Transported into the nucleus and integrates 

Term
Transcription of proviral DNA into genomic RNA & mRNA is done by
Definition
RNA pol II
Term
Spliced mRNA translated into early regulatory proteins ___, ___ & ___
Definition
tat, rev & nef
Term
What's the function of Tat
Definition
It's imported into the nucleus & initates transcription from the proviral LTR
Term
Whos most at risk for HIV
Definition
IV drug users
Term
What's the most common route of HIV infection
Definition
Heterosexual transmission
Term
The initial infection of HIV starts off as
Definition
Asymptomatic or resembles mono nucleosis but has oral thrush
Term
in the inital infection stage CD 4 levels decrease due to ____ ___
Definition
viral death
Term
Clinical latency the CD4 cough < 
Definition
500
Term
During clinical latency the patient is suspectible to _________ & _______ ______
Definition
Lymphoadenopathy & opportunistic infections
Term
AIDS is defined as
Definition
CD 4 < 200
Term
What malignancies are AIDS patients suspectible to
Definition

Non Hodgkins lymphoma

Kaposi sarcoma 

Term
What fungal infections are AIDS patients suspectible to
Definition

Candida albicans

Cryptococcus neoformans

Histoplasma

Coccidoides 

Term
What protozans infections are AIDS patients suspectible to
Definition

PCP

Toxoplasma

Crytosporidum 

Term
Name 4 Nucleoside Analog inhibitors of Reverse transcriptase
Definition
AZT, ddl, ddC, D4T
Term
Name 3 Protease inhibitors for HIV treatment
Definition
Saquinaiv, Indinavir Ritonavir
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