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HEPATITIS C

CLINICAL FEATURES:INCUBATION PERIOD – LONG (15-160DAYS),WITH A MEAN OF 50DAYS.ACUTE ILLNESS USUALLY MILD OR ANICTERIC.OVERT JAUNDICE IS SEEN IN ONLY ABT 5% OF PATIENTS.CHRONIC ILLNESS IS AN IMPORTANT PART IN HC.ABOUT

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Слайд 1HEPATITIS C
THEERAN GILL

HEPATITIS CTHEERAN GILL

Слайд 2CLINICAL FEATURES:
INCUBATION PERIOD – LONG (15-160DAYS),WITH A MEAN OF 50DAYS.
ACUTE

ILLNESS USUALLY MILD OR ANICTERIC.
OVERT JAUNDICE IS SEEN IN ONLY

ABT 5% OF PATIENTS.
CHRONIC ILLNESS IS AN IMPORTANT PART IN HC.
ABOUT 50 – 80% OF PATIENTS PROGRESS TO CHRONIC HEPATITIS WITH SOME DEVELOPING CIRRHOSIS AND HEPATOCELLULAR CARCINOMA.
CLINICAL FEATURES:INCUBATION PERIOD – LONG (15-160DAYS),WITH A MEAN OF 50DAYS.ACUTE ILLNESS USUALLY MILD OR ANICTERIC.OVERT JAUNDICE IS

Слайд 3EPIDEMIOLOGY:
ONLY SEEN IN HUMANS.
INFECTION IS MAINLY BY BLOOD TRANSFUSION &

OTHER MODES OF CONTACT WITH INFECTED BLOOD OF BLOOD PRODUCTS.
INJECTABLE

DRUG ABUSERS,TRANSPLANT RECIPIENTS & IMMUNOCOMPROMISED PERSONS ARE AT HIGH RISK.
SEXUAL TRANSMISSION IS PROBABLY LESS IMPORTANT.
VERTICAL TRANSMISSION FRM MOTHER TO BABY MAY TAKE PLACE.
EPIDEMIOLOGY:ONLY SEEN IN HUMANS.INFECTION IS MAINLY BY BLOOD TRANSFUSION & OTHER MODES OF CONTACT WITH INFECTED BLOOD

Слайд 4HCV:
VIRUS NOT GROWN IN CULTURE BUT HAS BEEN CLONED IN

E.coli.
IT’S A 50 – 60 NM VIRUS WITH A LINEAR

SINGLE STRANDED RNA GENOME,ENCLOSED WITHIN A CORE AND SURROUNDED BY AN ENVELOPE,CARRYING GLYCOPROTEIN SPIKES.
IT RESEMBLES FLAVIVIRUS IN STRUCTURE & ORGANISATION & HAS BEEN CLASSIFIED AS A NEW GENUS Hepacivirus IN THE FAMILY Flaviviridae.
HCV:VIRUS NOT GROWN IN CULTURE BUT HAS BEEN CLONED IN E.coli.IT’S A 50 – 60 NM VIRUS

Слайд 5THE VIRUS SHOWS CONSIDERABLE GENETIC AND ANTIGENIC DIVERSITY.
6 DIFFERENT GENOTYPES

& MANY SUBTYPES HAVE BEEN IDENTIFIED,INDICATING HIGH MUTABILITY.
BECAUSE OF THIS

DIVERSITY THERE IS LITTLE HETEROLOGOUS OF EVEN HOMOLOGOUS POSTINFECTION IMMUNITY IN HEPATITIS C.
THE VIRUS SHOWS CONSIDERABLE GENETIC AND ANTIGENIC DIVERSITY.6 DIFFERENT GENOTYPES & MANY SUBTYPES HAVE BEEN IDENTIFIED,INDICATING HIGH

Слайд 6LABORATORY DIAGNOSIS:
STANDARD METHOD OF DIAGNOSIS IS ANTIBODY DETECTION BY ELISA.
THE

ANTIGENS USED ARE VARIOUS STRUCTURAL AND NON STRUCTURAL PROTEINS CLONED

IN E.coli.
HAVE BEEN 3 SUCCESSIVE GENERATIONS OF SUCH ANTIGENS,INTRODUCED TO IMPROVE SENSITIVITY & SPECIFICITY OF SEROLOGICAL DIAGNOSIS.

LABORATORY DIAGNOSIS:STANDARD METHOD OF DIAGNOSIS IS ANTIBODY DETECTION BY ELISA.THE ANTIGENS USED ARE VARIOUS STRUCTURAL AND NON

Слайд 7EVEN THE 3RD GENERATION ELISA CURRENTLY IN USE,EMPLOYING NS-5 REGION

PROTEIN AND SYNTHETIC PEPTIDES BECOMES POSITIVE ONLY MONTHS AFTER THE

INFECTION AND SHOWS NON SPECIFIC REEACTIONS.
CONFIRMATION BY IMMUNOBLAST ASSAY IS RECOMMENDED.
HCV INFECTION ANTIBODIES APPEAR IRREGULARLY AND LATE,LIMITING THEIR DIAGNOSTIC UTILITY.

EVEN THE 3RD GENERATION ELISA CURRENTLY IN USE,EMPLOYING NS-5 REGION PROTEIN AND SYNTHETIC PEPTIDES BECOMES POSITIVE ONLY

Слайд 8IDENTIFICATION OF HCV RNA IN BLOOD PROVIDES MORE SENSITIVE AND

SPECIFIC RESULTS WITHIN FEW DAYS OF EXPOSURE TO HCV.
MOLECULAR METHODS

LIKE PCR AND BRANCHED DNA ASSAY ARE EMPLOYED FOR THE PURPOSE.
IDENTIFICATION OF HCV RNA IN BLOOD PROVIDES MORE SENSITIVE AND SPECIFIC RESULTS WITHIN FEW DAYS OF EXPOSURE

Слайд 9PROPHYLAXIS:
BLOOD SCREENING.
PASSIVE IMMUNISING AGENT IS AVAILABLE.

PROPHYLAXIS:BLOOD SCREENING.PASSIVE IMMUNISING AGENT IS AVAILABLE.

Слайд 10TREATMENT:
PROLONGED TREATMENT WITH INTERFERON ALPHA,EITHER ALONE OR IN COMBINATION WITH

ANTIVIRAL AGENTS LIKE RIBAVIRIN HAS BEEN REPORTED USEFUL IN SOME

CASES.
TREATMENT:PROLONGED TREATMENT WITH INTERFERON ALPHA,EITHER ALONE OR IN COMBINATION WITH ANTIVIRAL AGENTS LIKE RIBAVIRIN HAS BEEN REPORTED

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