PDF Sergei Nekhai, Ph.D. Objectives - Howard University
3/28/12
VIRAL PATHOGENESIS
Sergei Nekhai, Ph.D.
Objectives:
? Courses of viral infections
?Prinicipes of viral pathogenesis ?Role of different factors in pathogenesis ?Examples
Viral Pathogenesis
? Process by which a viral infection leads to disease
? Viral pathogenesis is an abnormal situation of no value to the virus.
? The majority of viral infections are subclinical. It is not in the interest of the virus to severely harm or kill the host.
? The consequences of viral infections depend on the interplay between a number of viral and host factors.
Outcome of Viral Infection
? Acute Infection ? Recovery with no residue effects ? Recovery with residue effects e.g. acute viral encephalitis leading to neurological sequelae. ? Death ? Proceed to chronic infection
? Chronic Infection ? Silent subclinical infection for life e.g. CMV, EBV ? A long silent period before disease e.g. HIV, SSPE, PML ? Reactivation to cause acute disease e.g. herpes and shingles. ? Chronic disease with relapses and excerbations e.g. HBV, HCV. ? Cancers e.g. EBV, HTLV-1, HPV, HBV, HCV, HHV-8
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Clinical latency
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