Micro Viruses -DIT o Flashcards
EBV Cancer(3)
Nasopharyngeal Carcinoma Burtkett lymphoma (african) Hodgkins Lymphoma (Immune comp)
heterophile Ab test
EBV monospot
Atypical cells
CD8 cells that look like B cells in a EBV infection
Reye Syndrome
Cause
symptoms
findings
hepatoenephalopathy, hypoglycemia, vomiting, coma
post viral infection (VZV and influenza B) and given aspirin
Find: ASA metal decrease beta oxidation by reversible inhibition of mitochonchonria enzymes
ASA exception to Reye’s
Kawasaki Disease
HCV family
RNA flavivirus
HDV family
RNA delta virus
HAV family
RNA piconavirus
HBV family
DNA hepadnavirus
HEV family
RNA hepevirus
Viral neonatal encephalitis (3 causes)
HSV1
HSV2 - temporal lobes
CMV
TORCH
Transplacental infections
Toxoplasma Other(syphilis) Ruebella CMV Herpes
Cowdry type A inclusion bodies
seen in HSV-1
encephalitis clue
Viral recombination
exchange of genes between 2 chromosomes by crossing over w/in regions of significant sequence homology
2 closely related viruses co-infect
DNA or RNA w/DNA phase
Viral reassortment
segemented genomes only (BOAR: Bunyavirus, orthomyxoviruses, arenaviruses, reoviruses)
viruses co infect and segments are exchanged -> new strands 9high frequency recombination)
Viral complementation
2 viruses infect a cell but one virus has a mutated genome resulting in a non functional protein
non mutated virus complements the mutated one allowing it to replicate
problem of replication still remains for the progeny
Viral Phenotypic mixing
simultaneous infection go cell w/ 2 viruses
Genome of virus A can be partially coated w/ surface proteins from virus B
Type B determines infectivity
Progeny though are from Virus A
Live attenuated vaccines (6)
Sabian's oral polio MMR intranasal influenza varicella yellow fever Small pox
Killed viral vaccines (4)
Rabies
injected influenza
Salk polio
HAV
Recombinent viral vaccines(2)
HBV
HPV
Normal DNA viral genome Structure
2 categories of exceptions and examples (1+3)
Usually double stranded and linear
Single stranded exception - parvovirus
circular
- hepadnavirus
- papillomavirus
- polyomavirus
Concern w/ egg allergy vaccines (3)
influenza
MMR
yellow fever
Circular DNA viruses (3) exceptions to the linear DNA rule
hepadnovirus
Papillovirus
polyomavirus
SS DNA virus (1) exception to the DS DNA
parvovirus - it is (-) stranded and needs to be transcribed 1st
Naked viruses
4 DNA
4 RNA
DNA - PAPP
- Parvoirus
- Adenovirus
- Polyomavirus
- Papillomavirus
RNA - CPR Hepe
- Calcivirus
- picovirus
- reovirus
- hepevirus
can transmit more readily ( no fluids needed)
+ strand RNA means?
the genome acts as a mRNA can be be directly translated into viral protein; transcribed copy (-) to replicate + and form a template to be passed on to progeny
(-) strand RNA needs to be transcribed to + strand 1st before viral protein can be made
DNA viral protein usually replicates where?
Exception
in the nucleus
Pox virus is an exception, too big
RNA viral protein is usually replicated where>
2 exceptions
in the cytoplasm
Exception
- infuenza virus
- retrovirus
Except for retroviruses, all other viruses are what
haploid
Retrovirus is diploid w/ 2 SS of RNA
Infectivity of viral genome directly is usually
exceptions (2 w/ DNA; RNA)
most dsDNA
- except Pox and HBV
+ stranded RNA
(except - stranded ssRNA)
exceptions require polymerases to be packaged w/in
Which viruses are not infectious in normal state
They need polymerase to complete infectivity
- Pox and HBV
- negative strand RNA
Latent infection established in the following herpes virus
HSV 1 HSV 2 VZV EBV CMV
HSV 1 - trigeminal ganglia HSV 2 - sacral ganglia VZV - Dorsal root ganglion EBV - B cells CMV - monocytes
Other infections of note w/ HSV 1 other than cold sores(4)
temporal lobe encephalitis
keratoconjunctivitis
gingivostomatovirus
oral herpes labialis
Tanzk stain used to detect what in what viruses?(3)
stains multi-nuceated giant cells
For HSV 1, HSV 2, VZV
Cowdry inctranuclear bodies found in (3)
HSV 2
HSV2
VZV
Give a patient a medication for what appears to be a sore throat but also has some painful posterior LAD and malaise and then develops a maculopapular rash
what happened?
gave a person with EBV ampicillin
Downey cells
Atypical lymphocytes of T cell origin in a EBV infection
What is the most concerning result of a VSV infection in the elderly?
pneumonia
Heterophile negative yet still has signs of mononucleosis (5)
CMV HIV Acute toxoplasmosis acute viral hepatitis strep throat
Most common congenital transmission in utero
CMV
Complication of CMV in a bone marrow transplant patient
life threatening pneumonia
Complications of CMV in an AIDS patient (3)
Retinitis
GI ulceration
esophagitis
HIV + patient being treated for dysphagia by giving antifungals and not getting better be concerned of
esphogitis due to CMV
Herpes virus genome description
dsDNA
linear
enveloped
EBV associated malignancies (6)
nasopharyngial carcinoma Burkitts lymphoma Hodgkins lymphoma diffuse large cell lymphoma oral hairy cell leukoplakia lymphoproliferative disorders
Owls eye inclusions seen in organ tissues
CMV infection
Reed sternberg seen in the vasculature
Roseola is due to ?
Presentation
exanthum subetum
due to HHV8
presents as high fevers for a couple days followed by diffuse macular rash
kid comes in w/ fever of 102 and seizures and later breaks into a macupapular rash a couple days later
HHV6 roseola
completed by febrile seizures
Karposi sarcoma is rare (5%) but more common in
infects what cells?
other organs that can be involved?
men who have sex w/ men
infects the spindle cells of vascular and lymphatic endothelial tissue
-> highly vascular lesions
the lung
Rx for karposi sarcoma tumors
4
HAART
Topical - alitretinoin
intralesion - vinblastine
liposomal anthracyclines - daunorubicin, doxorubicin
3 different types of Karposi sarcoma tumors
Classic -slow growing w/out much potential for METS
Epidemic - found in HIV/AIDs
Immunocompromised - transplant patients
Rx that needs viral thymidine kinase to work(3)
Treats? (2)
acyclovir
valacyclovir
famiciclovir
Inhibits RSV and VZV
Preffered drug for treating herpes zoster
famiciclover
Drug used by CMV viral kinase (2)
ganciclovir
valgancicilovir
viral dan polymerase inhibitor that does not need activation by viral kinase to work
rx(2)
Foscarnet
Rx for CMV retinitis and acyclovir resistant HSV
Toxicity : nephrotoxicity and anemia
What labs are you going to draw aftar starting a patient on ganciclovir?(2)
CBC - causes: neutropenia, leukopenia, thrombocytopenia
creatine - causes renal failure
Aplastic anemia in a sickle cell patient
parvo B19 virus
Child catches a fever and has slapped cheek rash that spreads to body
parvo B 19 virus
4 associations/presentations w/ parvo B19
Aplastic crisis in sickle cell patient
5ths disease/erythema infectiosum in kids (slapped cheeks and fever)
Rheumatoid like arthritis in adults
hydrops fatalis w/ pregnancy
Remember parvovirus only ss DNA, linear, no env
5ths disease is due to?
Parvo virus B19 (ss DNA, linear)
contagious before the characteristic sloped cheeks rash
HPV family of virus
Description
papillomavirus
dsDNA, circular (1/3), no env
1 and 2 - skin
6 and 11 - genital warts
16 and 18 CIN
JC virus is associated w/ what presentation
Family?
PML - progressive multifocal leukoencephalopathy in HIV
Polyomavirus (dsDNA, circular, no env)
Polyomovirus presentation
features
PML - progressive mulitfocal leukoencelpoathy due to JC virus
dsDNA and circular, NO env
Poxvirus has 3 presentations?
unique feature of family?
Small pox
cowpox - vaccinia
mulluscum contagiosum -
dsDNA, enveloped (only P starting dsDNA that is), linear
DNA dependent RNA polymerase w/ and replicates in the cytoplasm; too big
mulluscum contagiosum is apart of what family?
pox virus
dsDNA, enveloped, linear, rep in cytoplasm*
Adenovirus presents as (4)
conjunctivitis
pharangitis
diarrhea
pneumonia
non enveloped, dsDNA, linear
URI followed by conjunctivitis due to
adenovirus
Hepadinovirus causes
HBV
dsDNA, enveloped, circular (carries reverse transcriptase which works on the viral RNA product that the host cell machinery makes after infection)
most common cause of fatal infantile gastroenteritis is?
rotavirus, a reovirus
Remember reoviruses are only dsRNA virus