section hepatitis
DESCRIPTION
Fourth year pharmacy students (Hepatitis A&B)TRANSCRIPT
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Presented By Eman El-KhateebClinical pharmacy instructorFaculty of PharmacyTanta University
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What Is HepatitisWhat Is Hepatitis??
Dr.T.V.Rao MD 2
Hepatitis means inflammation of the liver Hepat (liver) + itis (inflammation)= Hepatitis
Viral hepatitis means there is a specific virus that is causing your liver to inflame (swell or become larger than normal)
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HepatitisHepatitisInflammation of the liverInflammation of the liver
Dr.T.V.Rao MD 3
Can have many causes drugs toxins alcohol viral infections (A, B, C, D, E) other infections (parasites, bacteria)
physical damage
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Viral HepatitisViral Hepatitis
Dr.T.V.Rao MD 4
55 typestypes::A: fecal-oral transmission
B: sexual fluids & blood to blood
C: blood to bloodD: travels with BE: fecal–oral transmission
VaccinePreventable
Adapted from Corneil, 2003
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AA“ Infectious”
“ Serum”
Viral hepatitis
Entericallytransmitted
ParenteralytransmittedF, G, TTV
? other
EE
OthersOthers
BB DD CC
Viral Hepatitis - Historical Perspectives
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Source ofvirus
feces blood/blood-derived
body fluids
blood/blood-derived
body fluids
blood/blood-derived
body fluids
feces
Route oftransmission
fecal-oral percutaneouspermucosal
percutaneouspermucosal
percutaneouspermucosal
fecal-oral
Chronicinfection
no yes yes yes no
Prevention pre/post-exposure
immunization
pre/post-exposure
immunization
blood donorscreening;
risk behaviormodification
pre/post-exposure
immunization;risk behaviormodification
ensure safedrinking
water
Type of HepatitisA B C D E
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Hepatitis A
Hepatitis A is an acute liver disease caused by the hepatitis A virus (HAV), lasting from a few weeks to several months. It does not lead to chronic infection.
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Picornavirus (RNA)
Humans are only natural host
Stable at low pH Inactivated by
high temperature, formalin, chlorine
Hepatitis A Virus
Dr.T.V.Rao MD 9
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Close personal contact
(e.g., household contact, child day care centers)
Contaminated food, water(e.g., infected food handlers, raw shellfish)
Blood exposure (rare)(e.g., injecting drug use, transfusion)Not transmitted by Transplacental route
Hepatitis A Virus Transmission
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Clinical Manifestations
Incubation period 2 – 6 weeks May be asymptomatic Overt illness in 5% Present as two stages, 1 Preicteric 2 Icteric
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Clinical features
Malaise, arthralgia Anorexia Nausea, omitting liver tenderness Onset of Jaundice Recovery in 4-6 weeks Mortality 0.1 – 1 %
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Complications: Fulminant hepatitis (Cs)
Cholestatic hepatitis (Cs)
Relapsing hepatitis
Chronic sequelae: None
Hepatitis A - Clinical Complications
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Laboratory Diagnosis
Acute infection is diagnosed by the detection of HAV-IgM in serum by EIA.
Past Infection i.e. immunity is determined by the detection of HAV-IgG by EIA.
Cell culture – difficult and take up to 4 weeks, not routinely performed
Direct Detection – EM, RT-PCR of faeces. Can detect illness earlier than serology but rarely performed.
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FecalHAV
Symptoms
0 1 2 3 4 5 6 12 24
Hepatitis A Infection
Total anti-HAV
Titer ALT
IgM anti-HAV
Months after exposure
Typical Serological Course
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Treatment No specific antiviral drug is available Treatment is symptomatic (Diet,
rest, fluid balance, avoiding hepatotoxic drugs)
Lab tests Fluminant Hepatitis Protection (hygiene, hand
washing, water purity and avoiding uncooked food)
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Many cases occur in community-wide outbreaks no risk factor identified for most cases highest attack rates in 5-14 year olds children serve as reservoir of infection
Persons at increased risk of infection travelers homosexual men injecting drug users
Hepatitis A Vaccination
StrategiesEpidemiologic Considerations
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Post-exposure prophylaxis Specific passive prophylaxis by
pooled normal human immunoglobulin given directly before exposure or in early incubation period can prevent or attenuate clinical illness.
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Vaccination for HAV Hepatitis A vaccination is
recommended for all children starting at age 2 year, travellers to certain countries, and others at risk.
A safe and effective formalin inactivated HAV vaccine.
A full course containing two intramuscular injections of the vaccine (6-12 M in between)
Protection starts after 4 weeks after injection and lasts for 5-8years
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Hepatitis A Vaccines
Dr.T.V.Rao MD 20
Inactivated whole virus HAVRIX (GlaxoSmithKline) VAQTA (Merck Vaccine Division) Pediatric and adult formulations Licensed for persons >2 years
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Epidemiology
A major communicable disease in the Devloping world. (Infectious)
Well cooked food and sanitary water supply will protect the individual living
Community hygiene is important in schools, hostels and jails, as overcrowding and poor sanitation favour the spread
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Dr.T.V.Rao MD 22
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Most Important Infectious Disease
There are more than 350 million carriers
25% of them will develop chronic active hepatitis.
World wide 1 million deaths a years are attributed to HBV related liver disease and Hepatocellular Carcinoma
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Hepatitis B
Hepatitis B is a liver disease caused by the hepatitis B virus (HBV). It ranges in severity from a mild illness, lasting a few weeks (acute), to a serious long-term (chronic) illness that can lead to liver disease or liver cancer.
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HBV – Surface antigens
Enveloped proteins on surface of virions and surplus 22 nm diameter spherical and filamentous particles constitute the B surface antigens
HBs Ag consists two major polypeptides and is glycolated
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Structure of hepatitis b virus
Dr.T.V.Rao MD 26
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HBV Structure & Antigens Dane Dane
particleparticle
HBsAg = surface (coat) protein ( 4 phenotypes : adw, adr, ayw and ayr)HBcAg = inner core protein (a single serotype) HBeAg = secreted protein; function unknownDr.T.V.Rao MD 27
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What are the clinical symptoms of Hepatitis B??
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Spectrum of Chronic Hepatitis B Diseases
1Chronic Persistent Hepatitis - asymptomatic
2. Chronic Active Hepatitis - symptomatic exacerbations of hepatitis
3. Cirrhosis of Liver
4. Hepatocellular Carcinoma
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Acute infection HBsAg positive, HbeAg
positive and anti-HBcAg IgM Rarely, IgM anti-HBc only
marker Usually seen in acute
fulminate Hep B Chronic infection
HBsAg positive and anti-HBcAg IgG
Previous Infection HBsAg negative anti-HBs positive IgG anti-HBc positive
Hbv – serology interpretation
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HEPATITIS B MARKERS: HBsAg:Present in acute or chronic
infection. HBsAb:Present in recovery or
immunization. Anti -HB Core: May be “Total”
(IgG&IgM) or IgM. Lifelong marker of past and active infection in either acute or chronic.
HBeAg:Acute infection, and extremely infectious.
Dr.T.V.Rao MD 31
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PRACTICE!!!!!!!!!!!!!!! HBsAg N. HBcAB (TOTAL) N. HBsAB N. HAV-IGM N. HCV N.
NO evidence of viral hepatitis viruses.
Dr.T.V.Rao MD 32
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Solving the problems
HBsAG N. HBcAB (TOTAL) P. HBsAB P. HAV-IGM N. HCV N. PAST INFECTION.
Dr.T.V.Rao MD 33
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Immunized for HBV infection
HBsAg N. HBcAB (total) N. HBsAB P. HAV-IGM N. HCV N.
Dr.T.V.Rao MD 34
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Practice..……
Dr.T.V.Rao MD 35
HBsAg P HBcAB (Total) P HBsAB N HAV-IGM N HCV N MAY BE ACUTE OR CHRONIC. Order Hep. B Core IgM and biopsy to clarify.
Recent injury & the IgM will be positive , If Acute.
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Co infection with HBV, HAV, and HCV
HBsAg P HBcAB (TOTAL) P HBsAB N HAV-IGM P HCV P
Dr.T.V.Rao MD 36
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Past infection with recovery, and then re-infection that has become chronic, this is very
rare but does happen.
HBsAG P HBcAB (total) P HBsAB P HAV-IGM N HCV N .
Dr.T.V.Rao MD 37
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Diagnosis A battery of serological tests are used for the diagnosis of
acute and chronic hepatitis B infection. HBsAg - used as a general marker of infection. HBsAb - used to document recovery and/or immunity to
HBV infection. anti-HBc IgM - marker of acute infection. anti-HBcIgG - past or chronic infection. HBeAg - indicates active replication of virus and therefore
infectiveness. (Critical outcome for chronic pts) HBV-DNA - indicates active replication of virus, more
accurate than HBeAg especially in cases of escape mutants. Used mainly for monitoring response to therapy.
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High ModerateLow/Not
Detectable
blood semen urineserum vaginal fluid feces
wound exudates saliva sweattears
breastmilk
Concentration of Hepatitis B Virus in Various Body Fluids
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Sexual - sex workers and homosexuals are particular at risk.
Parenteral - IVDA, Health Workers are at increased risk.
Perinatal - Mothers who are HBeAg positive are much more likely to transmit to their offspring than those who are not. Perinatal transmission is the main means of transmission in high prevalence populations.
Hepatitis B Virus Modes of Transmission
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Treatment Patients with Hepatitis needs
supportive treatment Recombinant Interferon alfa therpay
is beneficial in HBV and HCV
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Treatment Interferon - for HBsAg +ve carriers with chronic active hepatitis.
Response rate is 30 to 40%. alpha-interferon 2b (original) alpha-interferon 2a (newer, claims to be more efficacious and
efficient)
Lamivudine - a nucleoside analogue reverse transcriptase inhibitor.
Adefovir – less likely to develop resistance than Lamivudine and may be used to treat Lamivudine resistance HBV. However more expensive and toxic
Entecavir – most powerful antiviral known, similar to Adefovir Successful response to treatment will result in the disappearance of
HBsAg, HBV-DNA.
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Vaccination Genetically Engineered
Vaccination - highly effective recombinant vaccines are now available. Vaccine can be given to those who are at increased risk of HBV infection such as health care workers. It is also given routinely to neonates as universal vaccination in many countries.
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Blood screening is Mandatory
Other measures - screening of blood donors,
blood and body fluid precautions
is mandatory in majority of
Countreis
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Hepatitis B Immunoglobulin Hepatitis B Immunoglobulin - HBIG may be
used to protect persons who are exposed to hepatitis B. It is particular efficacious within 48 hours of the incident. It may also be given to neonates who are at increased risk of contracting hepatitis B i.e. whose mothers are HBsAg and HBeAg positive
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Hand washing Minimal health precaution to Medical and Paramedical staff
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ImmunoglobulinImmunoglobulin VaccineVaccine
HAV Post exposure during the incubation period (2-6 weeks) Or directly before exposure
• Inactivated virus•Before exposure by 2 weeks (preferably 4 weeks) • Immunized for 5-8 years • 2 years or older
HBV • Post exposure within 48 hours • For neonates of infected mother
• Recombinant vaccine- HBsAg•Before exposure • Can be taken routinely in neonates