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Viruses
from Feldman's guide
49
Medical
Graduate
09/17/2009

Additional Medical Flashcards

 


 

Cards

Term

small dsDNA, circular, non-enveloped

causes: warts of mucosa or squamous epithelia

Definition

Papovaviruses

HPV

Polyomaviruses

Term
Name the serotypes of HPV that cause cervical cancer and are part of the Gardasil vaccine
Definition

16, 18

 

note serotypes 16, 18, 31,33 cause dysplasia/cancer

vaccine covers 6,11 (both cause warts) + 16,18

Term
Describe the mechanism by which HPV causes cancer
Definition
E6 and E7 viral proteins bind p53 and Rb while E2 represses E6/7; when E2 activity is interrupted by the virus p53 and Rb are consitutively active --> dysplasia --> in situ carcinoma
Term

small dsDNA, non-enveloped

 

causes: acute respiratory disease, pharyngitis, conjunctivitis, hemorrhagic cystitis, acute gastroetneritis in infants

 

Definition
adenovirus
Term

small ssDNA, non-eveloped

causes: erythema infectiosum "slap cheek", aplastic crises in anemic patients, polyarthritis, hydrops fetalis

Definition
Parvovirus B19
Term

 

Causes orofacial lesions, remains latent in sensory nerve ganglia

Transmission: skin to skin contact

causes syncitia formation

Tzanck smear

Definition
Herpes Simplex 1
Term

large, linear dsDNA, enveloped

transmission: sexual or during birth

infects and destroys epithelial cells "below the belt"

Tzanck smear

Definition
Herpes Simplex 2
Term

large, linear dsDNA, enveloped

transmission: skin to skin or airborne

causes: rash in children, dermatomal rash in adults

Definition
Varicella-Zoster virus
Term

large, dsDNA, enveloped

transmission: bodily secretions

causes: perinatal infection during birth, mononucleosis, retinitis, transplantation infections, pneumonia in AIDS patients

"Owl's eye inclusion"

heterophile antibody negatvie

Definition
Cytomegalovirus
Term

Large dsDNA, enveloped

causes Roseola and Pityriasis rosea

 

Definition
HHV 6 and 7
Term

large, dsDNA, enveloped

causes Karposi's Sarcoma in AIDS patients

transmission: sexual

Definition
HHV 8
Term

large dsDNA, enveloped

infectious heterophile + mononucleosis

Burkitt's lymphoma, nasopharyngeal carcinoma

potential for splenic rupture

Definition
Epstein-Barr Virus
Term

large dsDNA, enveloped

can cause childhood skin rash

potential bioterror agent

 

Definition

Poxviruses

molluscum contagiosum- umbilicated pox-like rash

variola (smallpox)- eradicated

vaccina (vaccine strain of smallpox)

Term

small partially dsDNA circle, enveloped

transmission: sexual, parenteral, perinatal

often leads to hepatocellular carcinoma

Definition
Hepatitis B virus
Term

small, ssRNA +, non-enveloped

transmission: fecal-oral

can cause paralysis, meningitis, encephalitis

Definition
poliovirus
Term

small, ssRNA+, non-enveloped

causes Herpangia; hand, foot, and mouth disease, meningitis

transmission: respiratory

Definition
Coxsackie A virus
Term

small ssRNA +, non-enveloped

transmission: respiratory

causes: pleurodynia, myocaridal and pericardial infections

Definition
Coxsackie B virus
Term

small ssRNA, non-enveloped

most common cause of the common cold

transmission: respiratory

Definition
Rhinovirus
Term

small, ssRNA+, non-enveloped

only has 1 serotype

abrupt fever, nausea, anorexia, abdominal pain, icterus

transmission: fecal-oral, contaminated food

Definition
Hepatitis A virus
Term

small ssRNA+, non-enveloped

problem in developing countries

10-20% mortality in pregnant women

causes acute hepatitis

Definition
Hepatitis E
Term

small ssRNA+, non-enveloped

causes gastroenteritis

transmission: fecal-oral/contaminated food

onset within 24-48 hours, self-resolves

Definition
Norwalk Virus
Term

small dsRNA, non-enveloped, double capsid

causes gastroenteritis in infants

causes: fecal-oral, contaminated food

48 hours incubation period

Definition
Rotavirus
Term

small, ssRNA+, enveloped

transmission: blood, semen, drug needles

causes: chronic hepatitis, liver failure, cirrhosis

Definition
Hepatitis C
Term

small ssRNA+, zoonotic, arbovirus

causes encephalitis, arthrogenic disease, hemmorhagic fever, hepatitis

Definition

Flaviviruses

-dengue virus

-yellow fever virus

-west nile virus

Term

smal ssRNA+, enveloped

transmission: respiratory droplets

causes: rash, if congenital causes developmental problems in the fetus

Definition

Rubella

aka German Measles

Term

small ssRNA +, enveloped

second most common cause of the common cold

transmission: person to person

 

Definition
Coronavirus
Term

small ssRNA +, enveloped

transmission: civet cats to human

causes: severe upper respiratory tract infection, high fever, dyspnea, death

Definition
SARS virus
Term

+ strand RNA virus

requires Hep B co-infection

Definition
Hepatitis D virus
Term

small, ssRNA

contains reverse transcriptase

transmission: bodily fluids

infects CD4+ T cells --> immune dysregulation

Definition
HIV
Term

small ssRNA

packages revrse transcriptase

can cause Adult T-cell Leukemia or Hairy Cell Leukemia after a long latency period

Definition

HTLV-1 (adult T-cell)

HTLV-2 (Hairy cell)

Term

smal ssRNA (neg strand)

packages an RNA polymerase

causes: "flu", can cause bronchiolitis, otitis media, and croup in children

Definition

orthomyxovirus

Influenza A (human and animal)

Influenza B (human only)

Term

small ssRNA (neg strand), enveloped

causes croup (bark-like cough, stridor, subglottal swelling)

transmission: human to human

Definition
parainfluenza virus
Term

small ssRNA (neg strand), enveloped

causes parotitis, orchitis

Definition
Mumps
Term

small ssRNA (neg strand), enveloped

causes cough, coryza, conjuncitvitis

Koplik spots on bucchal mucosa

Definition

Measles

aka Rubeola

Term

small ssRNA (neg strand), enveloped

causes: bronchiolitis and pneumonia in children

 

most common cause of lower respiratory tract infection in kids

Definition
respiratory syncytial virus (RSV)
Term

small ssRNA (neg strand), enveloped

transmission: bite of an animal

causes: hydrophobia, CNS infeciton, death

Definition
Rabies virus
Term

small, ssRNA (neg strand), enveloped

causes: encephalitis, hemorrhagic fever

transmission: mosquito

 

Definition

Bunya viruses:

California encephalitis virus

LaCrosse virus

Crimean-Congo virus

Term

small ssRNA (neg strand), enveloped

causes: sudden noncardiogenic pulmonary edema, renal failure, death

transmission: inhalation of mouse urine/feces

Definition
Hantavirus
Term

small ssRNA, enveloped

causes: severe hemorrhagic fever, shock, death

transmission: airborne, blood

Definition

Filoviruses:

 

Marburg

Ebola

 

Term
Name the early viral proteins expressed by HSV-1
Definition
DNA polymerase and thymidine kinase which activate viral DNA synthesis
Term

When HSV goes into the latent state, no viral proteins are made

 

name the only thing that is made

Definition
RNA intron called the latency-associated transcript (LAT)
Term
This beta-herpesviradae causes microcephaly and can be latent in lymphocytes, epithelia
Definition
Cytomegalovirus
Term
Varicella pneumonia occurs more often in  _____
Definition

adults

 

because adults have a more robust immune sys

Term
Name the type of cell EBV infects and the cell responsible for the mononucleosis symptoms
Definition
EBV infects B cells, but it is the T-cell response to the infected B-cells that causes symptoms of mono
Term
Name the lymphoproliferative dirosders with which EBV is associated
Definition

Burkitt's lymphoma

nasopharyngeal carcinoma

NOn-hodgkin's lymphoma in HIV patients

hodgkin's lymphoma (50%)

Term
Name the viral antigens made by EBV during latency
Definition

EBNAs- Epstein-barr nuclear antigens

latent membrane protein (LMP)

Term
Besides CD4, there are two other co-receptors used for HIV entry into T-cells, name them
Definition

CCR5 or CXCR4

 

both are chemokine receptors that belong to the G-protein coupled receptor family

Term
Causes encephalitis primarily in the temporal lobe
Definition
herpes simplex virus
Term
Enveloped virus with two identical strands of positive (+) sense RNA
Definition
HIV
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