VIRAL INFECTIONS

VIRAL INFECTIONS - VIRAL INFECTIONS A. Acute infections: 1....

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Unformatted text preview: VIRAL INFECTIONS A. Acute infections: 1. Lysis host cells 2. Short duration days, sometimes weeks 3. Self limiting 4. Recovery immunity 5. Ex.: mumps, measles, influenza B. Persistent infections 1. Viruses continually present 2. Types a. Late complications 1). Follow acute infections 2). Occur several weeks, years after active infection 3). Few viruses present 4). Ex. Subacute sclerosing panencephalitis following measles b. Latent infections (Recurrent Infections) 1). Lysogenic (latent) proviruses reactivated 2). Viruses not detected until activated 3). Ex. Herpes simplex c. Chronic infections 1). Usually low grade symptoms (some acute) 2). Infections prolonged 3). Viruses continually present 4). Ex. Hepatitis B or C d. Slow infections (1). Develop very slowly, over long period time (years) (2). Few symptoms (3). Viruses gradually increase in number (4). Frequently lethal (5). Ex. HIV (AIDS) C. Prions 1. Protein molecules, no nucleic acids 2. Infections develop very slowly, usually fatal 3. Ex. Transmissible spongiform encephalopathies (mad cow disease) VIRAL CULTIVATION...
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VIRAL INFECTIONS - VIRAL INFECTIONS A. Acute infections: 1....

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