Orthomyxoviruses Orthomyxoviruses Influenza Viruses Influenza Viruses
Vaccine4 influenza
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Transcript of Vaccine4 influenza
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D-r Mitova 1
Vaccine 3Vaccine 3
D-r MitovaMU-Sofia
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D-r Mitova 2
Influenza
Highly infectious viral illness Epidemics reported since at
least 1510 At least 4 pandemics in 19th century Estimated 21 million deaths worldwide
in pandemic of 1918-1919 Virus first isolated in 1933
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D-r Mitova 3
Influenza Virus
Single-stranded RNA virus Family Orthomyxoviridae 3 types: A, B, C Subtypes of type A determined by
hemagglutinin and neuraminidase
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Influenza Virus Strains Type A - moderate to severe illness
- all age groups- humans and other animals
Type B - milder epidemics- humans only- primarily affects children
Type C - rarely reported in humans - no epidemics
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D-r Mitova 5
Influenza Virus
A/Fujian/411/2002 (H3N2)
Neuraminidase
Hemagglutinin
Type of nuclearmaterial
Virustype
Geographicorigin
Strainnumber
Year of isolation
Virus subtype
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Influenza Antigenic Changes
Hemagglutinin and neuraminidase antigens change with time
Changes occur as a result of point mutations in the virus gene, or due to exchange of a gene segment with another subtype of influenza virus
Impact of antigenic changes depend on extent of change (more change usually means larger impact)
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Influenza Antigenic Changes Antigenic Shift
– Major change, new subtype
– Caused by exchange of gene segments
– May result in pandemic
Example of antigenic shift– H2N2 virus circulated in 1957-1967
– H3N2 virus appeared in 1968 and completely replaced H2N2 virus
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Influenza Antigenic Changes Antigenic Drift
– Minor change, same subtype
– Caused by point mutations in gene
– May result in epidemic
Example of antigenic drift– In 2002-2003, A/Panama/2007/99 (H3N2) virus
was dominant
– A/Fujian/411/2002 (H3N2) appeared in late 2003 and caused widespread illness in 2003-2004
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Influenza Type A Antigenic Shifts
Year
1889
1918
1957
1968
1977
Subtype
H3N2
H1N1
H2N2
H3N2
H1N1
Severity ofPandemic
Moderate
Severe
Severe
Moderate
Mild
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Impact of Pandemic Influenza
200 million people could be affected Up to 40 million require outpatient visits Up to 700,000 hospitalized 89,000 - 200,000 deaths
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Influenza Pathogenesis
Respiratory transmission of virus Replication in respiratory epithelium with
subsequent destruction of cells Viremia rarely documented Viral shedding in respiratory secretions for
5-10 days
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Influenza Clinical Features
Incubation period 2 days (range 1-4 days)
Severity of illness depends on prior experience with related variants
Abrupt onset of fever, myalgia, sore throat, nonproductive cough, headache
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Influenza Complications
Pneumonia– primary influenza
– secondary bacterial
Reye syndrome Myocarditis Death 0.5-1 per 1,000 cases
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Impact of Influenza
~36,000 excess deaths per year >90% of deaths among persons >65 years
of age Higher mortality during seasons when
influenza type A (H3N2) viruses predominate
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Impact of Influenza Highest rates of complications and hospitalization
among young children and person >65 years Average of >200,000 influenza-related excess
hospitalizations per year since 1969
57% of all hospitalizations among persons <65 years of age
Greater number of hospitalizations during type A (H3N2) epidemics
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Influenza Diagnosis Clinical and epidemiological characteristics Isolation of influenza virus from clinical
specimen (e.g., nasopharynx, throat, sputum)
Significant risk in influenza IgG by serologic assay
Direct antigen testing for type A virus
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Influenza Epidemiology Reservoir Human, animals
(type A only) Transmission Respiratory
Probably airborne Temporal pattern Peak December – March
in temperate areaMay occur earlier or later
Communicability Maximum 1-2 days before to 4-5 days after onset
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Influenza Vaccines
Inactivated subunit (TIV)– Intramuscular
– Trivalent
Live attenuated vaccine (LAIV)– Intranasal
– Trivalent
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Composition of the 2007-2008 Influenza Vaccine*
A/Solomon Islands/3/2006 (H1N1)-like virus;
A/Wisconsin/67/2005 (H3N2)-like virus ; B/Malaysia/2506/2004-like virus ;
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Inactivated Influenza Vaccine Efficacy
70%-90% effective among healthy persons <65 years of age
30%-40% effective among frail elderly persons
50%-60% effective in preventing hospitalization
80% effective in preventing death
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05
10152025303540
Illness
Perc
en
t
0
2
4
6
8
10
Hosp Pneu Death
Per
cen
t
Influenza and Complications Among Nursing Home Residents
Vaccinated* Unvaccinated
RR=1.9 RR=2.0 RR=2.5 RR=4.2
*Inactivated influenza vaccine. Genesee County, MI, 1982-1983
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LAIV Efficacy in Healthy Children
87% effective against culture-confirmed influenza in children 5-7 years old
27% reduction in febrile otitis media (OM) 28% reduction in OM with accompanying
antibiotic use Decreased fever and OM in vaccine
recipients who developed influenza
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LAIV Efficacy in Healthy Adults
20% fewer severe febrile illness episodes 24% fewer febrile upper respiratory illness
episodes 27% fewer lost work days due to febrile
upper respiratory illness 18%-37% fewer days of healthcare provider
visits due to febrile illness 41%-45% fewer days of antibiotic use
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Timing of Inactivated Influenza Vaccine Programs
Actively target vaccine available in September and October to persons at increase risk of influenza complications, children <9 years, and healthcare workers
Vaccination of all other groups should begin in November
Continue vaccinating through December and later, as long as vaccine is available
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Inactivated Influenza Vaccine Schedule
AgeGroup
6-35 mos
3-8 yrs
>9 yrs
Dose0.25 mL
0.50 mL
0.50 mL
No.Doses1* or 2
1* or 2
1
*Only one dose is needed if the child received influenza vaccine during a previous influenza season
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Inactivated Influenza Vaccine Recommendations
All persons 50 years of age or older Children 6-23 months of age Residents of long-term care facilities Pregnant women Persons 6 months to 18 years receiving
chronic aspirin therapy Persons >6 months of age with chronic
illness
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Inactivated Influenza Vaccine Recommendations
Routine annual TIV vaccination for persons 50 years and older– Up to a third of persons 50-64 years have
high-risk conditions
– Only 35% received influenza vaccine in 1999
– May increase coverage in HCWs
– Reduced sick days
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Inactivated Influenza Vaccine Recommendations
Persons with the following chronic illnesses should be considered for inactivated influenza vaccine:– pulmonary (e.g., asthma, COPD)– cardiovascular (e.g., CHF)– metabolic (e.g., diabetes)– renal dysfunction– hemoglobinopathy– immunosuppression, including HIV infection
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Pregnancy and Inactivated Influenza Vaccine
Risk of hospitalization 4 times higher than nonpregnant women
Risk of complications comparable to nonpregnant women with high-risk medical conditions
Vaccination (with TIV) recommended if pregnant during influenza season
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HIV Infection and Inactivated Influenza Vaccine
Persons with HIV at higher risk of complications of influenza
TIV induces protective antibody titers in many HIV infected persons
Transient increase in HIV replication reported
TIV will benefit many HIV-infected persons
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Influenza Vaccine Recommendations
Healthcare providers, including home care (TIV only)
Employees of long-term care facilities (TIV only)
Household members of high-risk persons including children 0-23 months (TIV or LAIV*)
*household and other close contacts of immuno- suppressed persons should not receive LAIV
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Influenza Vaccine Recommendations*
Providers of essential community services Foreign travelers Students Anyone who wishes to reduce the
likelihood of becoming ill from influenza
*these groups may receive TIV, and some may be eligible for LAIV
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Influenza Vaccination of Children
Children <24 months at increased risk of hospitalization
Inactivated influenza vaccination of healthy children 6-23 months is recommended
Vaccination of household contacts and out-of-home caretakers is encouraged
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In the 2001 National Health Interview Survey, only 36% of healthcare workers reported receiving influenza vaccine in the previous 12 months.
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Simultaneous Administration of LAIV and Other Vaccines
Inactivated vaccines can be administered either simultaneously or at any time before or after LAIV
Other live vaccines can be administered at the same visit as LAIV
Live vaccines not administered on the same day should be administered >4 weeks apart
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Inactivated Influenza Vaccine Adverse Reactions
Local reactions 15%-20% Fever, malaise not common Allergic reactions rare Neurological very rare
reactions
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Live Attenuated Influenza VaccineAdverse Reactions
Children– no significant increase in URI symptoms, fever, or other systemic
symptoms
– significantly increased risk of asthma or reactive airways disease children 12-59 months of age
Adults– significantly increased rate of cough, runny nose, nasal congestion, sore
throat, and chills reported among vaccine recipients
– no increase in the occurrence of fever
No serious adverse reactions identified
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Inactivated Influenza VaccineContraindications and Precautions
Severe allergic reaction to a vaccine component (e.g., egg) or following a prior dose of vaccine
Moderate or severe acute illness
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D-r Mitova 39
Live Attenuated Influenza VaccineContraindications and Precautions
Children <5 years of age* Persons >50 years of age* Persons with underlying medical conditions* Children and adolescents receiving chronic
aspirin therapy*
*These persons should receive inactivated influenza vaccine
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Live Attenuated Influenza VaccineContraindications and Precautions
Immunosuppression from any cause Pregnant women* Severe (anaphylactic) allergy to egg or other
vaccine components History of Guillian-Barré syndrome Moderate or severe acute illness
*These persons should receive inactivated influenza vaccine
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LAIV Storage and Handling
Must be stored at < +5°F (-15°C ) at all times
Do NOT store in a frost-free freezer Store ONLY in a MANUAL defrost
freezer If no manual defrost freezer, must store
LAIV in special freezer box supplied by the manufacturer
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Influenza VaccineMissed Opportunities
Up to 75% of persons at high risk for influenza or who die from pneumonia and influenza may have received care in a physician's office in the previous year.
In one study all non-nursing home persons who died from pneumonia or influenza had at least one medical visit in the previous year.
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Influenza Antiviral Agents* Amantadine and rimantadine
– effective against influenza A only
– approved for treatment and prophylaxis
Zanamivir and oseltamivir– neuraminidase inhibitors
– effective against influenza A and B
– oseltamivir approved for prophylaxis
*see influenza ACIP statement for details
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Haemophilus influenzae type b
Severe bacterial infection, primarily in infants During late 19th century believed to cause
influenza Immunology and microbiology clarified in
1930s
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Haemophilus influenzae
Aerobic gram-negative bacteria Polysaccharide capsule Six different serotypes (a-f) of polysaccharide
capsule 95% of invasive disease caused
by type b
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Haemophilus influenzae type bPathogenesis
Organism colonizes nasopharynx In some persons organism invades
bloodstream and cause infection at distant site Antecedent URI may be a contributing factor
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Haemophilus influenzae type b Meningitis
Accounted for approximately 50%-65% of cases
Hearing impairment or neurologic sequelae in 15%-30%
Case fatality rate 2%-5% in spite of effective antimicrobial therapy
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Haemophilus influenzae type b Medical Management
Treatment with an effective 3rd generation cephalosporin, or chloramphenicol plus ampicillin
Ampicillin-resistant strains now common throughout the United States
Hospitalization required
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Haemophilus influenzae type b Epidemiology
Reservoir Human Asymptomatic carriers
Transmission Respiratory droplets
Temporal pattern Peaks in Sept-Dec and March-May
Communicability Generally limited buthigher in somecircumstances
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Haemophilus influenzae type bPolysaccharide Vaccine
Available 1985-1988 Not effective in children
<18 months of age Effectiveness in older children variable
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Polysaccharide Vaccines
Age-related immune response Not consistently immunogenic in children ≤2
years old No booster response Antibody with less functional activity
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Polysaccharide Conjugate Vaccines
Stimulates T-dependent immunity Enhanced antibody production, especially in
young children Repeat doses elicit booster response Antibody is biologically active in vitro
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HbOC Hibtiter
PRP-T ActHIB, TriHIBit
PRP-OMP PedvaxHIB, COMVAX
Conjugate Hib Vaccines
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D-r Mitova 54
Vaccine 2 mo 4 mo 6 mo 12-18 mo
HbOC x x x x
PRP-T x x x x
PRP-OMP x x x
Haemophilus influenzae type b VaccineRoutine Schedule
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Vaccination at <6 weeks of age may induce immunologic tolerance to Hib antigen
Minimum age 6 weeks Minimum interval 4 weeks for primary series
doses
Haemophilus influenzae type b Vaccine
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Haemophilus influenzae type b VaccineUse in Older Children and Adults
Generally not recommended for persons >59 months of age
Consider for high-risk persons: asplenia, immunodeficiency, HIV infection
One pediatric dose of any conjugate vaccine
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Swelling, redness, and/or pain in 5%-30% of recipients
Systemic reactions infrequent Serious adverse reactions rare
Haemophilus influenzae type b Vaccine
Adverse Reactions
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Haemophilus influenzae type b Vaccine Contraindications and Precautions
Severe allergic reaction to vaccine component or following prior dose
Moderate or severe acute illness Age <6 weeks
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Streptococcus pneumoniae Gram-positive bacteria 90 known serotypes Polysaccharide capsule important virulence
factor Type-specific antibody is protective
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Pneumococcal Disease
Most common cause of vaccine- preventable death
Most common cause of bacterial meningitis among infants and young children
Increasing antibiotic resistance
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Pneumococcal DiseaseClinical Syndromes
Pneumonia Bacteremia Meningitis
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Pneumococcal PneumoniaClinical Features
Abrupt onset Fever Shaking chills Productive cough Pleuritic chest pain Dyspnea, tachypnea, hypoxia
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Pneumococcal Pneumonia Estimated 175,000 hospitalized cases per
year Up to 36% of adult community-acquired
pneumonia and 50% of hospital-acquired pneumonia
Common bacterial complication of influenza and measles
Case-fatality rate 5%-7%, higher in elderly
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Pneumococcal Bacteremia
More than 50,000 cases per year in the United States
Rates higher among elderly and very young infants
Case fatality rate ~20%; up to 60% among the elderly
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Pneumococcal Meningitis
Estimated 3,000 - 6,000 cases per year in the United States
Case-fatality rate ~30%, up to 80% in the elderly
Neurologic sequelae common among survivors
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Pneumococcal Disease in Children
Bacteremia without known site of infection most common clinical presentation
S. pneumoniae leading cause of bacterial meningitis among children <5 years of age
Common cause of acute otitis media
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Pneumococcal Disease Epidemiology
Reservoir Human carriers
Transmission Respiratory Autoinoculation
Temporal pattern Winter–early spring
Communicability Unknown Probably as long as organism in respiratory secretions
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Pneumococcal Vaccines
1977 14-valent polysaccharide vaccine licensed
1983 23-valent polysaccharide vaccine licensed
2000 7-valent polysaccharide conjugate vaccine licensed
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Pneumococcal Polysaccharide Vaccine
Purified capsular polysaccharide antigen from 23 types of pneumococcus
Account for 88% of bacteremic pneumococcal disease
Cross-react with types causing additional 8% of disease
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Pneumococcal Conjugate Vaccine
Pneumococcal polysaccharide conjugated to nontoxic diphtheria toxin (7 serotypes)
Vaccine serotypes account for 86% of bacteremia and 83% of meningitis among children <6 years
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Pneumococcal Polysaccharide Vaccine
Purified pneumococcal polysaccharide (23 types)
Not effective in children <2 years 60%-70% against invasive disease Less effective in preventing pneumococcal
pneumonia
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Pneumococcal Conjugate Vaccine
Highly immunogenic in infants and young children, including those with high-risk medical conditions
>90% effective against invasive disease Less effective against pneumonia and acute
otitis media
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Pneumococcal Polysaccharide Vaccine Recommendations
Adults >65 years of age Persons >2 years with
– chronic illness
– anatomic or functional asplenia
– immunocompromised (disease, chemotherapy, steroids)
– HIV infection
– environments or settings with increased risk
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Pneumococcal Conjugate Vaccine
Routine vaccination of children age <24 months and children 24-59 months with high-risk medical conditions
Doses at 2, 4, 6, months, booster dose at 12-15 months
Unvaccinated children >7 months require fewer doses
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Pneumococcal Polysaccharide Vaccine Revaccination
Routine revaccination of immunocompetent persons is not recommended
Revaccination recommended for persons age >2 years at highest risk of serious pneumococcal infection
Single revaccination dose >5 years after first dose
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Pneumococcal Polysaccharide VaccineCandidates for Revaccination
Persons >2 years of age with:– Functional or anatomic asplenia
– Immunosuppression
– Transplant
– Chronic renal failure
– Nephrotic syndrome
Persons vaccinated at <65 years of age
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Pneumococcal Vaccines Adverse Reactions
Local reactions– polysaccharide 30%-50%
– conjugate 10%-20%
Fever, myalgia– polysaccharide <1%
– conjugate 15%-24%
Severe adverse reactions rare
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Pneumococcal VaccinesContraindications and Precautions
Severe allergic reaction to vaccine component or following prior dose of vaccine
Moderate or severe acute illness
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Rabies. Management and Prevention
Pre-exposure prophylaxis - Inactivated rabies vaccine may be administered to persons at increased risk of being exposed to rabies e.g. vets, animal handlers, laboratory workers etc.
Post-exposure prophylaxis - In cases of animal bites, dogs and cats in a rabies endemic area should be held for 10 days for observation. If signs develop, they should be killed and their tissue.
Wild animals are not observed but if captured, the animal should be killed and examined. The essential components of postexposure prophylaxis are the local treatment of wounds and active and passive immunization.
Once rabies is established, there is nothing much that could be done except intensive supportive care. To date, only 2 persons with proven rabies have survived.
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Postexposure Prophylaxis Wound treatment - surgical debridement should be carried out.
Experimentally, the incidence of rabies in animals can be reduced by local treatment alone.
Passive immunization - human rabies immunoglobulin around the area of the wound; to be supplemented with an i.m. dose to confer short term protection.
Active immunization - the human diploid cell vaccine is the best preparation available. The vaccine is usually administered into the deltoid region, and 5 doses are usually given.
There is convincing evidence that combined treatment with rabies immunoglobulin and active immunization is much more effective than active immunization alone. Equine rabies immunoglobulin (ERIG) is available in many countries and is considerably cheaper than HRIG.
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Rabies VaccinesThe vaccines which are available for humans are present are inactivated whole virus vaccines.
– Nervous Tissue Preparation e.g. Semple Vaccine - associated with the rare complication of demyelinating allergic encephalitis.
– Duck Embryo Vaccine - this vaccine strain is grown in embryonated duck eggs This vaccine has a lower risk of allergic encephalitis but is considerably less immunogenic.
– Human Diploid Cell Vaccine (HDCV) - this is currently the best vaccine available with an efficacy rate of nearly 100% and rarely any severe reactions. However it is very expensive.
– Other Cell culture Vaccines - because of the expense of HDCV, other cell culture vaccines are being developed for developing countries. However recent data suggests that a much reduced dose of HDCV given intradermally may be just be effective.