Micro - Viruses Flashcards
DNA viruses - 3 rules of thumb
all dsDNA (except parvovirus, which is ss)
all linear (except papilloma, polyoma (circular, supercoiled), and hepadna- (circular, incomplete))
all non-enveloped (except Herpes-, Hepadna-, which are enveloped)
Herpesviruses - name all
HSV1 (oral) HSV2 (genital) HSV3 (VZV) HSV4 (EBV) HSV5 (CMV) HSV6 (Roseola) HSV8 (Kaposi)
dsDNA, linear, enveloped
herpesvirus that causes Roseola
HSV6
dsDNA, linear, enveloped
herpesvirus that causes VZV
HSV3
dsDNA, linear, enveloped
herpesvirus that causes EBV
HSV4
dsDNA, linear, enveloped
herpesvirus that causes Kaposi
HSV8
dsDNA, linear, enveloped
herpesvirus that causes CMV
HSV5
dsDNA, linear, enveloped
herpesvirus that causes oral lesions
HSV1
dsDNA, linear, enveloped
herpesvirus that causes genital lesions
HSV2
dsDNA, linear, enveloped
herpesvirus features
Enveloped, dsDNA, linear
hepaDNAvirus - examples + features
HBV - enveloped, partially dsDNA and circular
Adenovirus - features
dsDNA, linear, non-enveloped
parvovirus - examples + features
Parvo B19
no envelope, ssDNA and linear (smallest DNA virus)
papillomavirus - examples + features
HPV
no envelope, dsDNA and circular
Polyomavirus - examples + features
JC virus
BK virus
no envelope, dsDNA and circular
Poxvirus - examples + features
Smallpox
Cowpox
Molluscum contagiosum
enveloped, dsDNA and linear (largest DNA virus)
HSV1 - clinical features (transmission, presentation, treatment)
transmission: respiratory droplets, saliva
ORAL (some genital) lesions - swollen gums w/ ulcerative lesions, enlarged tender CERVICAL LN
temporal lobe encephalitis (cowdry type A inclusion)
keratoconjunctivitis
treatment: acyclovir
dsDNA, linear, enveloped
HSV1 - where does it establish latency in?
trigeminal ganglia
dsDNA, linear, enveloped
HSV2 - clinical features (transmission, presentation, treatment)
sex, perinatally
GENITAL (some oral) lesions
dsDNA, linear, enveloped
HSV3 - clinical features (transmission, presentation, treatment)
respiratory secretions
chicken pox (begins on trunk and spreads to face and extremities)
shingles (post-herpetic neuralgia)
both can cause encephalitis, pneumonia
dsDNA, linear, enveloped
HSV3 - where does it establish latency in?
DRG or CNV ganglia
dsDNA, linear, enveloped
HSV4 - clinical features (transmission, presentation, diagnosis)
EBV
respiratory secretions, saliva
mono (profound fatigue, myalgias, fever, posterior cervical lymphadenopathy, hepatosplenomeagly, sore throat)
Infects B cells -> cause atypical CD8 T cells ““Downey Cells
Monospot test (+) - heterophile antibodies that agglutinate sheep RBC
dsDNA, linear, enveloped
HSV4 causes two types of malignancies in two different populations
Hodgkin lymphoma, Burkitt lymphoma (Africa, involves jaw)
Nasopharyngeal carcinoma (Japan, China, involves nostrils, pharynx, maxillary sinuses)”
dsDNA, linear, enveloped
What is the monospot test used for?
distinguish between CMV and EBV, both can cause mono-like sx (profound fatigue, myalgias, fever, posterior cervical lymphadenopathy, hepatosplenomeagly, sore throat)
EBV/HSV4 = Monospot test (+) heterophile antibodies agglutinate sheep RBC
CMV/HSV5 = Monospot test (-) heterophile antibodies do not agglutinate sheep RBC
HSV5 - clinical features (transmission, presentation, diagnosis)
CMV
- transmission: sex, organ transplants
- AIDs CD4 <50 - also w/ mono sx (but Monospot test (-)), retinitis/scotoma, interstitial pneumonia
- congential - ToRCHHes - sensorineural hearing loss, seizures, petechial rash
trmt: gangciclovir
dsDNA, linear, enveloped
where does CMV establish latency in?
mononuclear cells - see Owl eye inclusions
dsDNA, linear, enveloped
HSV6 - clinical features (transmission, presentation, diagnosis)
Roseola
transmitted via saliva
high fevers followed by diffuse macular rash, can cause febrile seizures; affects infants
dsDNA, linear, enveloped
HSV8 - clinical features (transmission, presentation, diagnosis)
Kaposi
transmitted via sex; common in HIV, transplant patients
endothelial cell neoplasm -> violaceous, flat nodular skin lesions
dsDNA, linear, enveloped
Adenovirus - clinical features (transmission, presentation, diagnosis)
pharyngitis, sore throat, pink eye (conjunctivitis) pneumonia, acute hemorrhagic cystitis
occurs in small outbreaks among individuals living together in close quarters (military barracks, camp dorms)
ø treatment
dsDNA, linear, non-enveloped
Parvovirus B19 - clinical picture in fetus, children, adults, and sickle cell patients?
fetus: hydrops fetalis
children: slapped cheek rash that spreads to the rest of the body
adults: anemia + RA-like sx
Sickle cell dz: aplastic anemia
ssDNA, linear, non-enveloped
Papillomavirus - clinical picture
HPV
6/11 = Condyloma acuminata (warts); koilocytes
16/18 = cervical cancer
dsDNA, circular, non-enveloped
Polyomavirus - clinical picture
JC virus PML in HIV patients; increased risk with Natalizumab
BK transplant patients, commonly targets kidney
dsDNA, circular, non-enveloped
Smallpox
eradicated
dsDNA, linear, non-enveloped
cowpox
milkmaid blisters
dsDNA, linear, non-enveloped
Molluscum contagiosum
poxvirus
flesh-colored dome lesions w/ umbilicated dimple;
common in wrestlers, immunosuppressed
dsDNA, linear, non-enveloped
RNA viruses - rule of thumbs
all ss (except Reoviridae)
all enveloped (except Reo, picorna, hepe, and calici)
all circular except (arena, bunya, and delta, which are circular
only multi-segmented viruses are: Reo, orthomyxo, arena, and bunya (BOAR)
(+) stranded: I went to a retro toga party where I drank flavored corona and ate hippy California pickles
(-) sense: Always Bring Polymerase Or Fail Replication
Reoviruses - examples + features
Rotavirus - DS RNA linear,10- 12 seg, ø envelope
PicoRNAvirus - examples + features
Poliovirus Echovirus Rhinovirus Coxsackie virus HAV
all ssRNA + linear, ø envelope
“PERCH on a Peak” - F/O spread (except Rhino); all can cause aspetic meningitis (except Rhino and HAV)
Hepevirus - example + features
HEV - ssRNA + linear, ø envelope
Calcivirus - example + features
Norovirus - SSRNA (+) linear, ø envelope
Flavivirus - example + features
HCV Yellow Fever Dengue St. Louis Encephalitis (SLE) West Nile
all SSRNA (+) linear, enveloped
Toga virus - example + features
Rubella
Eastern Equine Encephalitis
Western Equine Encephalitis
SSRNA (+) linear, enveloped
Retroviruses - example + features
HTLV
HIV
SSRNA (+) linear, enveloped
Corona virus
SSRNA (+) linear, enveloped
Orthomyxovirus - example + features
Influenza SS RNA (-) linear, 8 seg, enveloped
Paramyxovirus - example + features
SSRNA (-) linear, , enveloped, all contain surface F (fusion) protein, which causes respiratory epithelial cells to fuse and form multi-nucleated cells
Parainfluenza
RSV
Measles
Mumps
PaRaMyxovirus
Rhabdovirus - examples + features
Rabies
SSRNA (-) linear, enveloped
Filovirus - examples + features
Ebola
SSRNA (-) linear, enveloped
Arenavirus - examples + features
LCMV
Lassa Fever encephalitis
SSRNA (-) circular, 2 seg, enveloped
Bunyavirus - examples + features
California encephalitis
Sandfly/Rift Valley Fever
Crimean-Congo hemorrhagic fever
Hantavirus
SSRNA (-) circular, 3 seg, enveloped
Delta virus - examples + features
HDV
SSRNA (-) circular, enveloped
Rotavirus - clinical feature +
Reovirus, DSRNA linear,10- 12 seg, ø envelope
pediatrics gastroenteritis - esp during winter time in day-care centers
Destruction w. atrophy of villi -> incr. Na/K loss -> Right Out The Anus
Poliovirus - vaccines
PicoRNAvirus, SSRNA (+) linear, ø envelope
“Salk - killed
Sabin - live attenuated”
Echovirus - clinical features
PicoRNAvirus, SSRNA (+) linear, ø envelope
aseptic meningitis (incr. lymphocytes, decr. PMN, normal glucose)
Rhinovirus - clinical features
PicoRNAvirus, SSRNA (+) linear, ø envelope
common cold, >100 serotypes
ACID LABILE (destroyed by stomach acid and therefore does not infect the GI tract unlike the other picoRNAs)
Coxsackie virus - clinical features
PicoRNAvirus, SSRNA (+) linear, ø envelope
aseptic meningitis, herpangina (mouth blisters, fever)
HFMD (vesicular rash on palms and soles, oral mucosa), myocarditis, pericarditis
Norovirus - clinical features
Calcivirus, SSRNA (+) linear, ø envelope
viral gasteroenteritis
Yellow fever - clinical features
Flavivirus SSRNA (+) linear, enveloped
arbovirus transmitted via Aedes mosquito
reservoir: monkey or humans; transmitted via Aedes mosquito
sx: high fever, BLACK VOMIT, jaundice
Dengue - features
Flavivirus SSRNA (+) linear, enveloped
St. Louis Encephalitis (SLE) - features
Flavivirus SSRNA (+) linear, enveloped
West Nile - features
Flavivirus SSRNA (+) linear, enveloped
Rubella - clinical features in neonates, children,
Togavirus SSRNA (+) linear, enveloped
Congenital: ToRCHHes - blueberry muffin appearance (extramedullary hematopoiesis)
Children:
- “German Measles” - macular rash - starts on the face and spreads centrifugally downwards (ie only on trunk; not on limbs) fades after 3 days
- fever
- POST-AURICULAR ADENOPATHY (occipital, posterior cervical)
- arthralgias
- (-) koplik spots
- does NOT appear ill
Eastern Equine Encephalitis - features
Toga virus SSRNA (+) linear, enveloped
Western Equine Encephalitis - features
Toga virus SSRNA (+) linear, enveloped
Corona virus - clinical features
common cold, SARS
SSRNA (+) linear, enveloped
Influenza - clinical features
Orthomyxovirus SSRNA (-) linear, 8 seg, enveloped
HA (entry), NA (release)
genetic drift due to minor bp changes
genetic shift due to Hfr reassortment
∆s mucociliary function -> incr. risk for superimposed bacterial infections
vaccines for influenza
Killed (IM) or Live, attenuated (IN) vaccines
Oseltamivir and Zanamivir - both blocks NA to decrease release of progeny
role of surface F protein in paramyxoviruses
surface F (fusion) protein - causes respiratory epithelial cells to fuse and form multi-nucleated cells
Parainfluenza - clinical features
Paramyxovirus SS RNA (-) linear, surface F protein, enveloped
croup “seal-like barking”
RSV - clinical features; treatment (2)?
Paramyxovirus SSRNA (-) linear, surface F protein, enveloped
bronchiolitis and pneumonia in infants
Ribavirin - guanosine analog
Palivizumab (mAb F protein) prevents pneumonia in preemies”
Measles - clinical features; treatment?
Paramyxovirus SSRNA (-) linear, surface F protein, enveloped
“3C’s: Cough, Coryza (rhinitis), Conjunctivitis
macular-papular erythematous rash begins on face and migrates downwards to feet (includes limbs)
(+) koplik spots (bright red spots w. blue-white center on buccal mucosa that precedes rash by 1-2d)
very ill
Possible sequelae: SSPE (subacute sclerosing panencephalitis), encephalitis, giant cell pneumonia “
Vit A - prevent severe exfoliative dermatitis in malnourished children
Mumps - clinical features
Paramyxovirus SSRNA (-) linear, surface F protein, enveloped
Body parts = pom-POMS: Parotitis, Orchitis, aspetic Meningitis, Sterility
How does German measles and measles differ?
“German Measles”/Rubella
- macular rash - starts on the face and spreads centrifugally downwards (ie only on trunk; not on limbs) fades after 3 days
- (-) koplik spots
- does NOT appear ill
- POST-AURICULAR ADENOPATHY (occipital, posterior cervical)
- arthralgias
- fever
Measles
- macular-papular erythematous rash begins on face and migrates downwards to feet (includes limbs)
- (+) koplik spots (bright red spots w. blue-white center on buccal mucosa that precedes rash by 1-2d)
- very ill
Rabies - clinical features + treatment?
Rhabdovirus SSRNA (-) linear, bullet shaped virus, enveloped
common in bat, raccoon, skunk (US), dogs (worldwide)
travels to CNS via retrograde migration up nerve axons; forms Negri bodies in purkinje cells of cerebellum and hippocampus
long incubation pd. (wks-mo) before onset of sx (fever, malaise, extreme agitation, photophobia, hydrophobia, paralysis, coma -> death)
trmt: clean wound + vaccination + rabies Ig
Ebola - clinical features
Filovirus SS RNA (-) linear, enveloped
Marburg hemorrhagic fever - fatal
LCMV lymphocytic choriomeningitis virus - features
Arenavirus SSRNA (-) circular, 2 seg, enveloped
Lassa Fever encephalitis - features
Arenavirus SSRNA (-) circular, 2 seg, enveloped
spread via mice
California encephalitis
Bunyavirus SSRNA (-) circular, 3 seg, enveloped
Sandfly/Rift Valley Fever
Bunyavirus SSRNA (-) circular, 3 seg, enveloped
Crimean-Congo hemorrhagic fever
Bunyavirus SS RNA (-) circular, 3 seg, enveloped
Hantavirus
Bunyavirus SSRNA (-) circular, 3 seg, enveloped
hemorrhagic fever, pneumonia
HAV - features
PicoRNAvirus
SS (+) RNA linear icosahedral, ø enveloped
HBV - features
HepaDNAvirus
dsDNA (circular, incomplete), enveloped
HCV- features
Flavivirus
SS (+) RNA linear icosahedral, enveloped
HDV- features
Delta virus
SS (-) RNA, circular, enveloped
HEV- features
Calcivirus
SS (+) RNA linear icosahedral, ø enveloped
HAV
- transmission
- clinical features (Incubation pd, Carrier state, HCC risk)
- clinical picture
Transmission: F/O
clinical features (Incubation pd, Carrier state, HCC risk): short, ø, ø
Clinical picture: Asymptomatic (usually), Acute hepatitis, Alone
remember that it is a PicoRNAvirus
SS (+) RNA linear icosahedral, ø enveloped
HBV
- transmission
- clinical features (Incubation pd, Carrier state, HCC risk)
- clinical picture
transmissioN: parenteral, sexual, maternal/fetal
Incubation pd, Carrier state, HCC risk: long, yes, yes
DNA polymerase also has RT activity (polymerase completes the partial dsDNA -> host RNA-polymerase transcribe mRNA from it -> viral RT reverse transcribes viral RNA to DNA -> new viral particles forms and can integrate into host genome and act as an oncogene
remember that it is a HepaDNAvirus
dsDNA (circular, incomplete), enveloped
order at which antigens /antibodies appear in HBV?
SECES: SE = antigens; CES = antibodies
histological features of HBV?
acute hx: ballooning degeneration of hepatocyte and lymphocytic infiltrate
chronic hx: ground glass hepatocytes
HCV
- transmission
- clinical features (Incubation pd, Carrier state, HCC risk)
- clinical picture
Transmission: IVDU, post transfusion
Incubation pd, Carrier state, HCC risk: long, yes, yes
Features: Chronic, Cirrhosis, Carcinoma, Carrier
remember that it is a Flavivirus, SS (+) RNA linear icosahedral, enveloped
HDV
- transmission
- clinical features (Incubation pd, Carrier state, HCC risk)
- clinical picture
Transmission: Parenteral, sexual, maternal/fetal transmission
Incubation pd, Carrier state, HCC risk: short/long, yes, yes
features: defective virus - requires HBV coinfection (long) or superinfection (short, but bad prognosis)
remember that it is a Delta virus, SS (-) RNA, circular, enveloped
HEV
- transmission
- clinical features (Incubation pd, Carrier state, HCC risk)
- clinical picture
transmission: F/O
Incubation pd, Carrier state, HCC risk: short, ø, ø
Features - high mortality in pregnant women
Enteric, Expectant, Epidemics (waterborne)
remember that it is a Calcivirus, SS (+) RNA linear icosahedral, ø enveloped
rule of thumb about non-enveloped viruses?
ø envelope = ø destruction by gut
cowdry type A inclusions
HSV1 - oral
Downey cells
HSV4 - EBV
Owl eye inclusions
HSV5 - CMV
Koilocytes
HPV
Negri bodies
Rhabdovirus - rabies
DNA viruses - all dsDNA except
parvovirus, which is ssDNA
DNA viruses - all linear except
papilloma, polyoma (circular, supercoiled), and hepadna- (circular, incomplete)
DNA viruses - all non-enveloped except
Herpes-, Hepadna-, which are enveloped
RNA viruses - all ss except
Reoviridae (rotavirus)
RNA viruses - all enveloped except
calici
hepe
Reo
picorna
(remember CHiRP on a PERCH is an easy target b/c it’s not enveloped)
RNA viruses - all linaer except
bunya, arena, delta, which are circular
“It’s not BAD to be well-ROUNDED”
RNA viruses - only multi-segmented ones
Reo, orthomyxo, arena, and bunya
BOAR are complicated creatures
RNA viruses (+) sense only
(+) stranded: HIPpy RETRO TOGA party with FLAVored CORONA and CALIfornia PICkles, and real (+) vibes
Hepevirus RetroRNA Togavirus Flavivirus Coronavirus Calcivirus PicoRNAvirus
RNA viruses (-) sense only
(-) stranded: Always Bring Polymerase Or Fail Replication
Arenavirus Bunya virus Paramyxovirus Orthomyxovirus Filovirus Rhabdovirus