Upload
others
View
8
Download
0
Embed Size (px)
Citation preview
IMMUNITY & IMMUNIZATIONS
1
Outline
• Principles of Vaccination
• The different types of vaccines used
• Vaccine Safety
• Vaccine Storage and Handling
•Vaccine Administration
•Vaccine Adverse Reaction
Objectives
2
IMMUNIZATION - VACCINATION….A LONG STORY
•
• One of the most effective «weapons» in
medicine
• 10th century in Central Asia Smallpox ➔Africa - Europe
• 1798 Edward Jenner immunizes first time
against smallpox
• 1885 Louis Pasteur prepares the 1st vaccine against Rabbies
• 1923 Diphteria, Tetanus.
• 1926 Pertussis.
• 1927 BCG (bacillus Galmette-Guerin)
• 1955 Salk vaccine (IPV) against poliomyelitis
• 1960 OPV, MMR.
• 1964 Measles.
• 2000 HPV vaccine
History of Vaccination
3
INTRODUCTION
• Ability of human body to tolerate the presence of material indigenous to the body and to eliminate foreign material
• This discriminatory ability provide protection from infectious disease
• Indicated by the presence of antibody to the organism causing infectious disease
Immunity
4
Immunity5
INTRODUCTION6
Vaccination versus Immunization
Vaccination
• Vaccination is a process of inoculating the vaccine/ antigen into the body irrespective of seroconversion
Immunization
• Immunization is the process of inducing immune response in an individual either humoral or cell mediated
7
Vaccines
Vaccines are whole or parts of microorganisms administered to prevent an infectious disease
8
Biology of Vaccines9
• Eliminating disease producing capacity of the microorganism.
• The immune response-similar to natural infection but causes little or no clinical symptoms.
• Produces immunity in most of the recipients with 1 dose, except those administered orally
• Sensitive to heat, and can’t be given to immunodeficient patients or those on immunosuppressive therapy.
• Could revert to its original pathogenic form, only OPV
Live attenuated vaccine: Consist of
whole inactivated
microorganisms
Biology of Vaccines10
• LA viral vaccines: measles, mumps, rubella, varicella, yellow fever, rotavirus, OPV & intranasal influenza
• LA bacterial vaccines: BCG & typhoid (oral)
Live attenuated vaccine: Consist of
whole inactivated
microorganisms
Biology of Vaccines
• Could not cause disease from infection even in an immunodeficient person
• Require multiple doses to cause immunity.
• Immune response is mostly humoral, no cellular immunity.
• Antibody titer against IV diminish with time
• Inactivated whole virus vaccines: IPV, Hep-A & rabies
• Inactivated whole bacterial vaccines: Pertusis
• Fractional vaccines: subunits-Hep B, influenza, acellular pertussis, HPV; toxoids-Diptheria & tetanus
Inactivated vaccine:
Produced by growing the
microorganism in culture media,
inactivating with heat and/or
chemicals (formalin)
11
12
Modification of Toxin to Toxoid
toxin moiety antigenic determinants
chemical
modification
Toxin Toxoid
Biology of Vaccines
• The immune response to pure PS vaccine is T-cell independent, therefore not immunogenic in children<2 years of age; pneumococcal, meningococcal & typhoid polysaccharide vaccines
• Repeat dose of PS vaccine do not cause a booster response; predominant antibody produced in response to PS vaccine is IgM
• Conjugation of PS vaccine with a protein molecule changes the immune response from T-cell independent to T-cell dependent- increased immunogenicity in infants & booster response; Hib, Pneumococcal & Meningococcal conjugate vaccine
Polysaccharide vaccine: A type of
inactivated subunit vaccine composed of long chain of
sugar molecules that make up the surface of
certain bacteria
13
Free vaccines are provided to protect
the baby against these 14 diseases:
✓ Diphtheria Rotavirus Pneumococcal disease
✓ Pertussis Hepatitis B Varicella
✓ Tetanus Measles
✓ Polio Mumps
✓ Influenza Rubella
✓ Haemophilus influenzae type B
✓ Meningococcal disease
✓
Childhood immunization program is
one of the best in the world. 14
Immunization schedule
Ideal Immunization schedule
• Epidemiologically relevant
• Immunologically competent
• Technologically feasible
• Socially acceptable
• Affordable
• Sustainable
For Government Programs it is cost first, efficacy next, safety lastFor Individual it is safety first, efficacy next, cost last
15
Factors may influence the immune
response to vaccination
• The presence of maternal antibodies
• Nature and dose of antigen
• Route of administration &presence of an adjuvant (improve the immunogenicity of the vaccine)
• Host factors such as (age, nutritional status, and coexisting disease)
16
Scheme of immunization
• Primary vaccination
• One dose vaccines (BCG, varicella, measles, mumps, rubella, yellow fever)
• Multiple dose vaccines (polio, DPT, hepatitis B)
• Booster vaccination
• To maintain immunity level after it declines after some time has elapsed (DT, MMR).
17
Jordan
Jordan was one of the first middle east countries that
established a national immunization program in
1979.
Vaccination coverage ≥90% reduced mortality and
morbidity rates caused by diseases included in the
schedule.
Combination vaccines were used despite its high cost
were used to reduce pain and no. of injections in the
same visit.
18
New vaccines are introduced to the schedule with
time:
- HBV 1995
- HiB 2001
- Penta (IPV, DTaP, HiB) 2010.
- Rota 2015
- Hexa (IPV, DTaP, HiB, HBV) 2017.
19
National Immunization Schedule
Age Vaccines
Birth BCG,
2 months DTaP1, IPV1, HepB1, Hib1, Rota1, (PCV1)
3months DTaP2, IPV 2,OPV1, HepB2, Hib2,Rota 2
4months DTaP3, IPV 3,OPV2, HepB3, Hib3,Rota 3, (PCV2)
9 months Measles,OPV 3,Vitamin A(100.000IU)
12months MMR1
18-24 months DTP, OPV4, MMR2,Vitamin A(200.000IU)
7 years dT,OPV5
16 years dT
Pregnant T according to the history of each person
20
Tow Important TERMS
Contraindication: is a condition that greatly increases the chance of a
serious adverse reaction.(MMR)
Permanent Contraindications: All vaccines
Anaphylactic reaction to prior dose of vaccine
Anaphylactic reaction to a component of the vaccine
Precaution : a condition that mightincrease the chance or severity of a
serious adverse reaction
21
The following are also NOT
contraindications to vaccination:
Family history of any adverse reactions following immunisation
Previous history of pertussis, measles, rubella or mumps infection
Prematurity: immunisation should not be postponed
Stable neurological conditions such as cerebral palsy and Down’s syndrome
Contact with an infectious disease
Asthma, eczema, hay fever or ‘snuffles’
Treatment with antibiotics or locally-acting (e.g. topical or inhaled) steroids
Child’s mother is pregnant
Child being breast fed
History of jaundice after birth
Under a certain weight
Over the age recommended in immunisation schedule
‘Replacement’ corticosteroids
22
HIGH-RISK children
Recommended vaccines for HIGH-RISK children (Vaccines under special circumstances)
1. Influenza vaccine
2. Meningococcal vaccine
3. Cholera vaccine
4. Rabies vaccine
5. Yellow fever vaccine
6. PPSV 23
High-risk category of children:➢Congenital/acquired immunodeficiency➢Chronic cardiac, pulmonary, hematologic, renal, liver disease & diabetes mellitus➢Children on long term steroids, salicylate, immunosuppressive or radiation therapy➢Cerebrospinal fluid leak, Cochlear implant, Malignancies➢Children with functional/anatomic asplenia/hyposplenia➢During disease outbreaks➢Laboratory personnel & health care workers➢Travelers
23
Different type of adverse events following immunization
Vaccine reaction Event caused/precipitated by the inherent properties of the vaccine (active component, adjuvant, preservative, stabilizer) when given correctly
Program errors Event caused by an error in vaccine preparation, handling or administration
Coincidental Event that happens after immunization but is not caused by the vaccine
Injection reaction
Event arising from anxiety about, or pain from, the injection itself rather than the vaccine
Unknown The cause of the event cannot be determined
24
Common minor vaccine reactions
Vaccine Local reaction (pain, redness, swelling)
Fever Irritability, malaise & non specific reactions
BCG common
Hib 5-15% 2-10%
Hep-B Adults-15%Children-5%
1-6%
Measles/MMR
10% 5-15% 50% (rash)
OPV <1% <1%
TT/DT/Td
10% 10% 25%
DwPT 50% 50% 60%
25
Rare serious vaccine reactions
Vaccine Reaction
BCG Suppurative adenitis, BCG osteitis, Disseminated BCGitis
Hep-B Anaphylaxis
Measles/MMR Febrile seizures, thrombocytopenia, anaphylaxis
OPV VAPP
TT Brachial neuritis, anaphylaxis, sterile abscess
DTP Persistent inconsolable screaming, seizures, HHE, anaphylaxis, shock
Rota Serious allergic reactions,intussuseption
26
Managing Acute Vaccine Reactions
Staff should be familiar with the signs and symptoms of anaphylaxis because they usually begin within minutes of vaccination:
- can include, but are not limited to: flushing, facial edema, urticaria, itching, swelling of the mouth or throat, wheezing, and difficulty breathing.
❑ Epinephrine and equipment for maintaining an airway should be available for immediate use.
27
Patient care before administering vaccine
- The patient’s immunization history should be reviewed at every healthcare visit.
- Use the current immunization schedule based on the age of the patient to determine all recommended vaccines that are needed.
- Patient or Parent Education including Vaccine Safety & Risk Communication
- The prophylactic use of antipyretics before or at the time of vaccination is not recommended.
28
- Screening for contraindications and precautions can prevent adverse events following vaccination.
- The patient’s status may change from one visit to the next or recommendations regarding contraindications and precautions may have changed.
29
Screening for contraindications and
precautions to vaccination
Is the child sick today?
Does the child have allergies medications, food, or any
vaccine?
Has the child had a serious reaction to a vaccine in the past?
Has the child had a seizure, or brain or nerve problem?
Has the child a health problem with asthma, lung disease,
kidney disease, metabolic disease such as diabetes, or a
blood disorder?
30
Screening for contraindications and
precautions to vaccination (Continue)
Does the child have cancer, leukemia, ADIS, or any other immune system problem?
Has the child taken cortisone, prednisone, other steroids, or anticancer drugs, or had x-ray treatments in the past 3 months?
Has the child received a transfusion of blood or blood products, or been given a medicine called immune (gamma) globulins in the past year?
Is the child/pregnant pregnant or there is a chance she could become pregnant during the next month?
Has the child received vaccination in the past 4 weeks?
31
Patient Care During Vaccine
Administration
Simple strategies that can be used by both parents and
providers to make receiving vaccines easier include:
- Displaying a positive attitude through facial expressions, body
language, and comments
- Using a soft and calm tone of voice
- Making eye contact, even with small children
Explaining why vaccines are needed.
- Being honest and explaining what to expect (e.g., do not say
that “the injection won’t hurt”).
32
Procedural Pain Management
Breastfeeding
Sweet tasting solutions.
Injection technique (aspiration and slowly injecting
the vaccine may increase pain)
Order of injections (administer most painful vaccine
last)
Tactile stimulation (rub/stroke near injection site
prior to and during injection
Distraction
Topical anesthetics.
33
Infection Control
Hand hygiene
Gloves
Equipment Disposal
34
Vaccine Administration
Preparation
Injection technique
Choice of needle length
and size
Injection site
These are all important
considerations as each
factor can affect both the
immunogenicity and the
risk of local reactions at
the injection site
35
Reconstitution of vaccine
Each vaccine should only be reconstituted and drawn up when required in order to:
- Avoid errors
- Maintain efficacy and stability
Reconstitution of freeze-dried vaccines:
- -Only use diluent supplied and use within specified time period
- -Only mix vaccines that are licensed and recommended to be mixed with other vaccines
Before administration:
- -Check colour and composition of vaccine is as specified in description in vaccine’s
- -Check vaccine to ensure is right product and correct dose for patient
- -Check expiry date
36
Route of Injection
Vaccines should not be given intravenously
Most vaccines* should be given intramuscularly:
This reduces the chance of local reactions and leads to a better immune response to the vaccine
It is important the vaccine is injected into muscle and not into fat. This is why the deep subcutaneous route is no longer recommended for most vaccines
However:
Individuals with a bleeding disorder should receive their vaccines by deep subcutaneous injection to reduce risk of bleeding.
37
38
Injection site
Intramuscular Injections Site
Preterms & neonates Anterolateral thigh (junction of middle & lower third)Infants
Toddlers & older children Deltoid or Anterolateral thigh
Adolescents & adults Deltoid
Subcutaneous Injections Site
Infants thigh
>12 months Outer triceps
Intradermal Injections Site
All age Left deltoid Region
39
40
sciatic nerve anatomy
41
Skin cleaning
Clean skin does NOT require cleaning
Visibly dirty skin need only be washed with soap
+ water
If alcohol and other disinfecting agents are used,
skin must be allowed to dry as these could
inactivate live vaccines
42
Positioning of Patient
All ages: ensure vaccination area is completely exposed
Babies and young children:
sit child sideways on parent’s lap
ensure child is held securely
if anterolateral aspect of thigh being used: parent to ‘cuddle’ child closely and place child’s nearest arm around parent’s back. Parent to place one of their arms over child’s other arm and hold both legs firmly by placing their hand just above the child’s knees
if deltoid being used: parent to hold arm to be injected close to child’s body and tuck other arm behind parent’s back. Tuck child’s legs between parent’s legs or ask parent to hold legs firmly
43
Common vaccine administration errors include:
Doses administered too early.
Wrong vaccine (e.g., Tdap instead of DTaP)
Wrong dosage (e.g., pediatric formulation of hepatitis B
vaccine administered to an adult)
Wrong route
Expired vaccine or diluent administered
Vaccine which was not stored properly administered
Vaccine administered to a patient with a contraindication for
that vaccine
Wrong diluent used to reconstitute the vaccine or only the
diluent was administered
44
Strategies to Prevent Administration Errors
Adhere to “Rights of Medication Administration”
Provide ongoing staff training and education
Keep current reference materials available for staff
Rotate vaccines so those with shortest expiration
dates are in front and check frequently to remove
any expired vaccines
Do not store sound-alike and look-alike vaccines
next to each other
45
Administer only vaccines that you have prepared
Triple check your work before administering a
vaccine
Color code and label vaccines with type, age, and
gender, if applicable
Store pediatric and adult vaccines on separate
shelves
Avoid interruptions when selecting and preparing
vaccines.
46
CURRENT ISSUES
REGARDING
IMMUNISATION
47
Documentation
➢ Date of administration
➢ Title of vaccine(s) administered
➢ Batch number
➢ Expiry date
➢ Site(s) of administration
➢ Information as appropriate to record
➢ Patient-held record
48
Consent
➢Consent must always be obtained before every
immunisation its include:
➢What immunisation(s) are to be given
➢Which disease(s) will be prevented
➢Benefits and risks of immunisation versus risks of
disease(s)
➢Possible side effects and how to treat
➢Any follow-up/action required
➢Any new information
➢Agreement to proceed
49
Deep freezer (-15 to -25O C) for ice packs & OPV stock for 3 months
ILR (+2 to +8OC) BCG, DPT, DT, TT, measles, Hep B stock for 3 months
Cold box (+2 to +8OC) for transport & power failure
Vaccine carrier (+2 to +8OC) For 12 hours
Cold chain
50
Vaccine Stability
Sensitivity to HEAT
BCG
Varicella
MMR
MenC
Hepatitis B
DT and/or
aP/IPV/HIB
Sensitivity to COLD
HepB and
combination
DTand/or aP/IPV/HIB
Influenza
MenC
*MMR
*Varicella
*BCG
(*Freeze dried)LEAST
SENSITIVE
MOST
SENSITIVE
51
Light Sensitive
Sensitive to strong light, sunlight, ultraviolet, fluorescents (neon)
BCG
MMR
Varicella
Meningococcal C Conjugate
Most DTaP containing vaccines
Vaccines should
always be stored in
their original
packaging until
point of use to
protect them from
light
52
Temperature Monitoring
✓ Use max/min thermometer
✓ Probe should be placed in the centre of fridge
✓ Temperature should be recorded at least once a day
✓ Reset daily
✓ Calibrate as recommended
✓ Take immediate action if temperature is outside recommended range
53
Sample refrigerator temperature record
chart
Available at: http://www2.cdc.gov/nip/isd/immtoolkit/content/vacstorage/logs.htm
54
Storage temperature
Never exceed 8ºC or fall below 2ºC
Aim for 5ºC
Aim to maintain vaccine fridge as close as possible to 5˚C as this gives a safety margin of + or – 3˚c
✓
55
56
Thank you
57