Difference between revisions of "Virus"

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This article collects all things '''virus'''.  The more general topic of infective things is dealt with in [[microorganisms]].
#redirect [[Viruses]]
 
Many virus afflict humans.  Only a few of them can be diagnosed histologically.
 
==Viral inclusions - types==
Cowdry types:<ref>URL: [http://www.pathconsultddx.com/pathCon/largeImage?pii=S1559-8675%2806%2970864-6&figureId=fig3&ecomponentId=mmc3 http://www.pathconsultddx.com/pathCon/largeImage?pii=S1559-8675%2806%2970864-6&figureId=fig3&ecomponentId=mmc3]. Accessed: 12 January 2010.</ref>
*Cowdry type A inclusion:<ref>URL: [http://www.whonamedit.com/synd.cfm/3495.html http://www.whonamedit.com/synd.cfm/3495.html]. Accessed on: 22 January 2010.</ref>
**Round eosinophilic material surrounded by a clear halo.
*Cowdry type B inclusion:<ref>[http://www.whonamedit.com/synd.cfm/3496.html http://www.whonamedit.com/synd.cfm/3496.html]. Accessed on: 22 January 2010.</ref>
**Neuropathology thingy. (???)
 
Images:
*[http://www.daff.gov.au/animal-plant-health/pests-diseases-weeds/aquatic_animal_diseases_significant_to_australia_identification_field_guide/diseases_of_crustaceans/viral_diseases_of_crustaceans/infectious_hypodermal_and_haematopoietic_necrosis/histological_page_for_infectious_hypodermal_and_haematopoietic_necrosis Cowdry A inclusion (daff.gov.au)].
*[http://focosi.altervista.org/pathohomoprocess_regressive.html Cowdry type A & type B inclusions (altervista.org)].
 
=Viruses=
==Herpes simplex virus==
*Abbreviated ''HSV''.
 
===General===
Several subtypes:
*Canker sores - usually HSV-1.
*Genital herpes - usually HSV-2.
 
===Histology/cytology===
Features:<ref>SM. 11 January 2010.</ref>
*Clear "ground glass" nuclei.
**Rim of peripheral chromatin.
*Nuclear inclusions.
*Multinucleation with nuclear molding, i.e. multiple nuclei that touch over a large surface area.
 
Mnemonic - 3 Ms: Margination, Multinucleation, Molding.
 
Images:
*[http://www.virology.org/sbpgphoto2.html Herpes simplex virus - multinucleation (virology.org)].
*[http://commons.wikimedia.org/wiki/File:Herpes_simplex_virus_pap_test.jpg HSV on a Pap test - showing multinucleation (WC)].
*[http://commons.wikimedia.org/wiki/File:Herpes_esophagitis_-_very_high_mag.jpg HSV esophagitis - very high mag. (WC)].
*[http://commons.wikimedia.org/wiki/File:Herpes_esophagitis_-_intermed_mag.jpg HSV esophagitis - intermed. mag. (WC)].
 
==Cytomegalovirus==
*Abbreviated ''CMV''
===General===
*The name comes from the microscopic appearance.
 
===Microscopic===
Features:
*Very large nucleus (as the name implies) with clearing.
*Granular cytoplasmic inclusions (red on H&E sections).
 
Notes:
*Classically in endothelial cells.
**In the context of [[esophagus|esophageal ulcers]], it is therefore useful to biopsy the base of the ulcer - if this is suspected.
 
Images:
*[http://commons.wikimedia.org/wiki/File:CMV_placentitis2_mini.jpg CMV placentitis (WC)].
 
===IHC===
*IHC for CMV is available - highlights granular cytoplasmic inclusions; increases [[sensitivity]].
 
==Human papilloma virus==
*Abbreviated ''HPV''.
 
===General===
*Causes a lot of pathology:
**Benign:
***[[Verruca vulgaris]].
***[[Condyloma acuminatum]].
***[[Esophagus#Human_papilloma_virus_esophagitis|HPV esophagitis]].
**Malignant:
***[[Uterine cervix|Cervical cancer]].
***Anal cancer.
***Squamous cell carcinoma in the [[Head & neck pathology|head & neck]].
 
===Microscopic===
Features:
*Koilocytes:
** Perinuclear clearing.
** Nuclear changes.
*** Size similar (or larger) to those in the basal layer of the epithelium.
*** Nuclear enlargement should be evident on low power, i.e. 25x.
*** Central location - nucleus should be smack in the middle of the cell.
 
Images:
*[http://commons.wikimedia.org/w/index.php?title=File:Low-grade_squamous_intraepithelial_lesion.jpg LSIL (WC)].
*[http://commons.wikimedia.org/wiki/File:Low-grade_sil_and_endocx.jpg LSIL & endocervix (WC)].
 
===IHC===
*p16 +ve -- stains most cells infected by HPV.
 
==Adenovirus==
===General===
*Common in kids.
**May be seen in the context of [[adenovirus appendicitis|(adenovirus) appendicitis]].
 
===Microscopic===
Features:
*"Smudge" cells<ref>URL: [http://www.pathguy.com/lectures/infect.htm http://www.pathguy.com/lectures/infect.htm]. Accessed on: 8 July 2010.</ref> - black/blue blob ~ 10-15 micrometers. (???)
 
Notes:
*May be morphologically similar to ''[[CMV]]'', ''[[HSV]]'', ''[[VZV]]'' inclusions.
 
Images:
*[http://img.medscape.com/fullsize/migrated/438/534/cc438534.haur.fig1.jpg Adenovirus (medscape.com)].<ref>URL:[http://www.medscape.com/viewarticle/438534_2 http://www.medscape.com/viewarticle/438534_2]. Accessed on: 8 July 2010.</ref>
*[http://wiki.medpedia.com/Image:Ab14.jpg?filetimestamp=20091014175858 Smudge cell (medpedia.com)].
*[http://www.flickr.com/photos/ckrishnan/3746778145/in/photostream/ Necrosis in germinal centre - low mag. (flickr.com)].
*[http://www.flickr.com/photos/ckrishnan/3746778007/in/photostream/ Viral inclusions - high mag. (flickr.com)].
*[http://www.flickr.com/photos/ckrishnan/3747567554/in/photostream/ IHC for adenovirus (flickr.com)]
 
==Parvovirus==
*[[AKA]] ''Parvovirus B19''.
===General===
*Most significant in pregnant women.
**Parvovirus attacks the nucleated RBCs of the fetus - causes an ''aplastic [[anemia]]''.
 
Trivia:
*First described in 1975.<ref name=pmid46024>{{Cite journal  | last1 = Cossart | first1 = YE. | last2 = Field | first2 = AM. | last3 = Cant | first3 = B. | last4 = Widdows | first4 = D. | title = Parvovirus-like particles in human sera. | journal = Lancet | volume = 1 | issue = 7898 | pages = 72-3 | month = Jan | year = 1975 | doi =  | PMID = 46024 }}</ref>
**The "B19" part comes from the label for the specimen.<ref name="pmid17304869">{{cite journal |author=Servey JT, Reamy BV, Hodge J |title=Clinical presentations of parvovirus B19 infection |journal=Am Fam Physician |volume=75 |issue=3 |pages=373–6 |year=2007 |month=February |pmid=17304869 |doi= |url=http://www.aafp.org/afp/991001ap/1455.html}}</ref>
 
===Microscopic===
Features:
*Glassy (red) nuclear inclusions.<ref>URL: [http://www.pathguy.com/lectures/infect.htm http://www.pathguy.com/lectures/infect.htm]. Accessed on: 8 July 2010.</ref>
*Nuclear enlargement.
 
Images:
*[[WC]]:
**[http://commons.wikimedia.org/wiki/File:Parvovirus_infection_-_cropped_2_-_very_high_mag.jpg Parovirus - version 1 - very high mag. (WC)].
**[http://commons.wikimedia.org/wiki/File:Parvovirus_infection_-_cropped_1_-_very_high_mag.jpg Parvovirus - version 2 - very high mag. (WC)].
*www:
**[http://info.fujita-hu.ac.jp/~tsutsumi/photo/photo210-1.htm Parvovirus (fujita-hu.ac.jp)].<ref>URL:[http://info.fujita-hu.ac.jp/~tsutsumi/case/case210.htm http://info.fujita-hu.ac.jp/~tsutsumi/case/case210.htm]. Accessed on: 8 February 2011.</ref>
**[http://www.scielo.br/img/revistas/rimtsp/v49n2/07f1a.jpg Parvovirus - placenta - (scielo.br)].<ref>URL: [http://www.scielo.br/scielo.php?pid=S0036-46652007000200007&script=sci_arttext http://www.scielo.br/scielo.php?pid=S0036-46652007000200007&script=sci_arttext]. Accessed on: 18 August 2011.</ref>
**[http://www.fujita-hu.ac.jp/~tsutsumi/case/case219.htm Parvovirus - several images (fujita-hu.ac.jp)].
 
==Epstein-Barr virus==
*Abbreviated ''EBV''
===General===
*Cases mononucleosis.
*Part of the herpes group of viruses.<ref>URL: [http://www.meddean.luc.edu/lumen/MedEd/orfpath/herpes.htm http://www.meddean.luc.edu/lumen/MedEd/orfpath/herpes.htm]. Accessed on: 14 April 2011.</ref>
 
====Associations====
Cancer:<ref name=Ref_PCPBoD8_169>{{Ref PCPBoD8|169}}</ref>
*Classical [[Hodgkin lymphoma]].
*[[Burkitt lymphoma]].
*[[Nasopharyngeal carcinoma]].
*B cell lymphomas -- in immunosuppressed individuals.
**[[Post-transplant lymphoproliferative disorder]].
 
*[[Hemophagocytic syndrome]].<ref name=pmid20819601>{{cite journal |author=Jin YK, Xie ZD, Yang S, Lu G, Shen KL |title=Epstein-Barr virus-associated hemophagocytic lymphohistiocytosis: a retrospective study of 78 pediatric cases in mainland of China |journal=Chin. Med. J. |volume=123 |issue=11 |pages=1426–30 |year=2010 |month=June |pmid=20819601 |doi= |url=}}</ref>
 
===Microscopic===
Features:
*Variable - see specific pathologies in ''Associations'' section.
**+/-Atypical lymphocytes.
**+/-Hemophagocytosis (uncommon).
 
=See also=
*[[Microorganisms]].
*[[Basics]].
*[[HIV]].
 
=References=
{{Reflist|2}}
 
[[Category:Microorganisms]]

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