DNA VIRUSES Flashcards
Icosahedral shaped; enveloped; 90-100 nm
HERPES VIRIDAE
Produce latent infection
HERPES VIRIDAE
(specific infectious agent without any manifest symptom; remains inactive in the body with no symptoms)
latent infection
: latency in nerve cells; HSV 1 & 2, VZV
Neurotropic
: latency in lymphocytes (associated with cancer); EBV, CMV
Lymphotropic
Reactivation may result from physiological stress
HERPES VIRIDAE
When reactivated, symptoms are usually milder than primary infection except shingles which is the reactivation of VZV
HERPES VIRIDAE
characteristic lesions
HERPES VIRIDAE
: scraping of an ulcer base to look for Tzanck cells
Tzanck Test
(multinucleated giant cells) - most commonly seen in microscope
Tzanck cells
commonly infects skin and mucous membranes
(HSV, VZV)
internal infection
(CMV, EBV)
produces intranuclear inclusions and multinucleated giant cells
HERPES VIRIDAE
• used to treat infections caused by certain viruses
Acyclovir
• treats cold sores around the mouth, shingles, and chicken pox
Acyclovir
Non-enveloped
Icosahedral
PAPOVIRIDAE
22-26 nm
PARVOVIRIDAE
only DNA virus pathogenic to man with a single stranded genome
PARVOVIRIDAE
smallest icosahedral DNA virus
PARVOVIRIDAE
endemic zoonotic infection
PARVOVIRIDAE
replicate entirely within the cytoplasm
POXVIRIDAE
MOT POXVIRIDAE
Inhalation
POXVIRIDAE CONTROL
Vaccination
220-450 nm (largest DNA)
POXVIRIDAE
RNA, naked virion
HEPATITIS A
24-30 nm
HEPATITIS A
Family Picornaviridae
HEPATITIS A
Mortality rate: 1%
HEPATITIS A
Fatality rate: 30%
VARIOLA MAJOR
Fatality rate: 1%
VARIOLA MINOR
DNA, envelope
HEPATITIS B
42-47 nm
HEPATITIS B
dane particles (complete Hepatitis B virus)
HEPATITIS B
Family Hepadnaviridae
HEPATITIS B
Only DNA virus amongst Hepadnaviridae
HEPATITIS B
Contains RNA and has a lipid envelope
HEPATITIS C
Family: Flaviviridae (under RNA viruses)
HEPATITIS C
Most common cause of Non-A and Non-B Hepatitis
HEPATITIS C
Common worldwide
HEPATITIS C
No vaccine for Hepatitis C
HEPATITIS C
Contains RNA, naked virus
HEPATITIS D
35-37 nm
HEPATITIS D
“D”
Delta virus
RNA, 32-34 nm
HEPATITIS E
most common cause of Hepatitis in countries with poor sanitation
HEPATITIS E
RNA and has an envelope
HEPATITIS G
Common worldwide but not pathogenic
HEPATITIS G
fecal-oral route, contaminated shellfish
HAV
Mnemonic for Hepatitis with fecal oral route: TAE-
Hepatitis A and E