DNA VIRUS Flashcards
DNA VIRUSES
HHAPPPPYy
Hepadna
Herpes
Adeno
Pox
Parvo
Papilloma
Polyoma
All dna virus are double stranded ecept
PARVOVIRUS
All dna virus have linear sna except
Papillomavirus (circular, supercoiled)
Polyomavirus ( circular, spuercoiled)
Hepadnavirus (circular, incomplete)
All dna virus are icosahedral except
Poxvirus (complex)
All dna virus replicate in the nucleus except
POXVIRUS (cytoplasm;carries own DNA-dependent RNA polymerase)
Parvoviridae virus
Parvovirus b19
only known human parvovirus (one serotype)
Parvovirus B19
Parvoviridae transmission
Close contact, probably respiratory, transplacental, or from blood and blood products
Fifth disease
Erythema infectiosum (slapped cheek rash)
Erythemainfectiosumor fifth disease [“slapped cheek” rash], transient aplastic crisis, fetal infection (fetal death and “hydrops fetalis”), arthritis, : red cell aplasia, and chronic B19 infection.
Parvovirus B19
Treatment for parvovirus
IV immunoglobulin can be used with aplastic crisis
Diagnosis for parvovirus
SEROLOGY
PCR
HISTOLOGY
Lace like rash on extremities
Parvovirus b19
Adenoviridae virus
Human adenovirus
no envelope with approx. 50 human serotypes
Human Adenovirus
Human adenovirus site of latency
Replication in oropharynx
URT: Pharyngitis, conjunctivitis, coryza serotype
3,7,8,19,37
LRT : bronchitis, atypical pneumonia serotype
Serotype 14
GIT: acute gastroenteritis (infantile diarrhea) serotype
40,41
GUT: acute hemorrhagic cystitis serotype
Serotype 7,11,21
Human adenovirus (URT)
Pharyngitis
Conjunctivitis
Coryza
Human adenovirus (LRT)
Bronchitis
Atypical pneumonia
Human adenovirus (GIT)
acute gastroenteritis
Human adenovirus (GUT)
Acute hemorrhagic cystits
Diagnosis for adenovirus
Cell culture (HEp-2) [Cowdry type B intranuclear basophilic inclusion bodies]
EIA for gastroenteritis (40-41)
PCR
Human adenovirus prevention
Vaccine (adenovirus 4 and 7) for military recruits
papovaviruses
pa = papilloma
po = polyoma
va — vacuolating agent
small nonenveloped icosahedral viruses which replicate in the nucleus and may transform infected cells.
Papovaviruses
HPV types 1 to 100+ (as determined by genotype; types defined by DNA homology, tissue tropism, and association with oncogenesis)
Papillomavirus
SV40, JC virus, BK virus, KI, WU, Merkel cell polyomavirus (MCPyV)
Polyomavirus
Double-stranded circular DNA genome replicated and assembled in nucleus
Papovaviridae
Human Papilloma Virus targets
Epithelial tissue (Infect squamous cells and induce formation of cytoplasmic vacuole (koilocytes)
Human Papilloma Virus transmission
Direct contact, sexual contact for genital warts
Human Papilloma Virus Disease
Skin and Genital warts, benign head and neck tumors, anogenital
:warts
Human Papilloma Virus treatment
Surgical or chemical removal; podophyllin
What type of HPV are the skin and plantar warts, verruca vulgaris
HPV 1,2,4,7
What type of HPV Genital Warts
HPV 6 and 11
Genital warts in HPV also known as
Condyloma acuminata
Most common viral std
HPV 6 and 11
HPV involves Carcinoma of the cervix, vulva, penis, anus
HPV 16,18,31,33
Treatment for Genital Warts
Podophyllin
Treatment for Skin warts
Liquid nitrogen
Treatment for Plantar warts
Salicylic acid
JC Polyoma Virus or
John Cunningham virus
Second smallest DNA virus
PAPOVAVIRIDAE
The smallest DNA virus; the only DNA virus that is single-stranded.
PARVOVIRIDAE
Causes progressive multifocal leukoencephalopathy in patients with AIDS
JC Polyoma Virus
Demyelinating disease that affects the oligodendrocytes characterized by deficits in speech, coordination, and memory
JC POLYOMA VIRUS
JC: Junky Cerebrum
causes hemorrhagic cystitis and nephropathy in patients with solid organ (kidney) and bone marrow transplants
BK Polyoma Virus
Diagnosis for BK polyoma virus
BKV blood test or a urine test for decoy cells
Biopsy of the kidneys
PCR techniques
Polyomavirus
BK AND JC VIRUS
Site of latency Polyomaviruses
Kidney
JC DIAGNOSIS
PCR (CSF and urine) or EM (brain tissue);
Have large, enveloped, icosahedral capsids
containing double-stranded DNA genomes.
Herpesviridae
Encode many proteins that manipulate the host
cell and immune response.
Herpesviridae
Encode enzymes (DNA polymerase) that promote viral DNA replication and are good targets for antiviral drugs.
Herpesviridae
DNA replication and capsid assembly occurs in the nucleus.
Herpesviridae
Herpesviridae Virus is released by
Exocytosis by cell lysis, and through cell-to-cell bridges.
• Can cause lytic, persistent, latent, and (for Epstein- Barr virus) immortalizing infections.
HHV-3 targets
Mucoepithelial and T cells
HHV 4
Epstein-Barr virus
HHV 8
Kaposi sarcoma-related virus
HHV 5
Cytomegalovirus
HHV 6
Herpes lymphotropic virus
Targets b cells and epithelial cells
Epstein-barr virus (HHV-4)
Targets lymphocytes and other cells
HHV 8 Kaposi sarcoma p-related virus
Targets monocytes, granulocytes, lymphocytes and epithelial cells
HHV 5 Cytomegalovirus
Herpes Simplex Viruses (HSV) virus
Herpes simplex virus types 1 and 2 (HSV-1 and -2)
Transmission HSV 1
Saliva and direct
Transmission HSV 2
Sexual or transvaginal
Site of latency of HSV
Sensory nerve ganglia (neuron)
Site of latency of HSV 1
Trigeminal ganglia
Site of latency of HSV 2
Lumbosacral ganglia
HSV DIAGNOSIS
Tzanck smear (multinucleated giant cell), Cowdry type A,
Cell culture (HDF, others), EIA, FA stain, PCR (CSF herpes encephalitis)
HSV DISEASE
Vesicle filled with virus particles and cell debris
is the most common cause of sporadic, fatal encephalitis in the USA
HSV-1
Varicella-Zoster virus (VZV) site of latency
Dorsal root ganglia
Varicella-Zoster Virus (VZV) / HHV-3
Chicken pox
Shingles
Ramsay Syndrome
Congenital varicella
Chicken pox
Varicella
Shingles
Herpes zoster
Dewdrop on a rose petal appearance
Varicella / Chicken pox
Deliberating pain (postherpetic neuralgia)
Herpes zostes
Reactivation of latent VZV residing within geniculate ganglion
Ramsay-hunt syndrome
A triad of ipsilateral facial paralysis, ear pain, and vesicles on the face, on the ear, or in the ear is the typical presentation.
Ramsay-hunt syndrome
asymptomatic infections, congenital disease of newborn, systemic infection of immunocompromised host, and heterophile negative IM
Cytomegalovirus
Cytomegalovirus site of latency
WBCs, endothelial cells, cells in a variety of organs
Cell culture (HDF), shell vial culture, CMV antigenemia, FA stain, PCR, negative heterophil test, Giant cells with “owl’s-eye” nuclear inclusion
Cytomegalovirus
Infectious mononucleosis (IM) [“Kissing disease”], progressive, lymphoreticular disease, oral hairy leukoplakia in HIV-infected patients
Epstein-Barr Virus
Epstein-barr virus site of latency
B lymphocytes (C3d complement)
Downey cells
Epstein-barr virus / HHV-4
HHV 6 and 7
Roseola (roseola infantum/exanthem subitum/6th
Diseased:isease),fever,malaise,rash,leukopenia,andinterstitial pneumonitis in organ transplant patients
HHV 6-7 site pf latency
T lymphocytes (CD4 cells)
Human herpesvirus type 8 (HHV-8) site of latency
viral genome found in Kaposi’s sarcoma tumor cells, endothelial cells, and tumor- infiltarting leukocytes
HHV-8 disease
Kaposi’s sarcoma
Poxviridae virus
Smallpox (variola) and molluscum contagiosum
largest and most complex of all viruses; brick- shaped virion with nonconforming symmetry referred to as complex; dsDNA
Poxviridae
all diseases of the skin
Poxviridae
generalized infection with pustular rash;
Smallpox
manifest benign nodules of skin.
molluscum contagiosum
Only disease that has been eradicated from the face of the earth
Smallpox
Prodome of fever and malaise followed by centrifugal rash
Small pox
SMALL POX HP
Guarnieri bodies
Intracytoplasmic eosinophilic inclusions
Guarnieri bodies (smallpox)
Henderson-Patterson bodies (Molluscum contagiosum)
Flesh colored dome shaped papules with central umbilication
Molluscum contagiosum
Molluscum contangiosum HP
Henderson-Patterson bodies