Immunization Flashcards
💡Resistance to disease specifically infectious disease
IMMUNITY
Collection of cells, tissues and molecules that 💡mediate resistance to infections
IMMUNE SYSTEM
💡Coordinated reaction of cells and molecules to infectious microbes
IMMUNE RESPONSE
Live or inactivated substance 💡capable of producing an immune response
ANTIGEN
Protein molecules produced by 💡B lymphocytes to help 💡eliminate an antigen
ANTIBODY
CONCEPTS ON IMMUNITY
SEE ANKI
Types of Immunity
A. NATURAL/INNATE IMMUNITY
B. ADAPTIVE/ACQUIRED IMMUNITY
▪ 💡First line of defense
▪ 💡Immediate protection against microbial invasion
▪ Rapidly mobilized at the site of infection but 💡lacks immunologic memory
▪ 💡Natural or 💡Native Immunity
▪ Innate immune responses 💡enhance adaptive immune responses against the infectious agent
▪ 💡Non-specific resistance of the body against infection.
NATURAL/INNATE IMMUNITY
NATURAL/INNATE IMMUNITY
▪ Non-specific resistance of the body against infection.
▪ 💡Barriers: skin, GIT and respiratory epithelium, mucous membranes
▪ 💡Dendritic Cells: Antigen presenting function
▪ 💡NK Cells: Destroy irreversibly stressed and abnormal cells
▪ 💡Phagocytic cells:
○ 💡Monocytes - cytotoxic ability
○ 💡Macrophages - antigen presenter
○ 💡Polymorphonuclear cells/Neutrophils - kills extracellular pathogens
○ And 💡auxiliary cells- involved in inflammation process
○ 💡Mast cells
○ 💡Basophils
○ 💡Platelets
3 Important Cells in Phagocytosis:
○ 💡Neutrophils • Circulating pool • Marginated pool ○ 💡Circulating monocytes ○ 💡Fixed tissue macrophages
▪ 💡Second defense system
▪ Develops more 💡slowly and provides more 💡specialized defense against infections
▪ 💡SPECIFIC IMMUNITY or 💡ACQUIRED IMMUNITY
▪ 💡Specific for the pathogen and confers protective immunity to reinfection with the pathogen
▪ Specifically 💡recognize and destroy the pathogen because lymphocytes carry specialized cellular receptors and produce specific antibodies
• 💡Highly specific resistance of the body against infections
ADAPTIVE/ACQUIRED IMMUNITY
What are the cells that mediates ADAPTIVE/ACQUIRED IMMUNITY?
B lymphocytes
T lymphocytes
Categories of Acquired Immunity:
Cell-mediated immunity
Humoral immunity
- Specific immunity mediated by 💡T-cells
- Most T cells recognize only 💡protein antigens
- Acts against foreign bodies/ tissues and defense against intracellular microbes
- 💡Activates other cells in immune system
Cell-mediated immunity
What are the cells that mediate Cell-mediated immunity?
HELPER T CELLS
CYTOTOXIC T CELLS
NATURAL KILLER CELLS
💡Antigen Presenting Cells – activation of macrophages/ inflammation and activation of T and B lymphocytes
HELPER T CELLS
Killing of Infected Cells
CYTOTOXIC T CELLS
NATURAL KILLER CELLS
o 💡Long-term resistance
o 💡Antibodies
o 💡B lymphocytes
o Enter the circulation and mucosal fluids
o Neutralize and eliminate microbes and microbial toxins
o Outside host cells, in the blood, extracellular fluid derived from plasma, and in the lumens of mucosal organs
o 💡Slow onset of action specific immunity
o Antibodies produced by B-cells
Humoral immunity
IMMUNOGLOBULINS
IgG IgM IgA IgE IgD
- 💡Cross the placentae
- Most abundant immunoglobulin in 💡newborns
- Persists 💡longer in secondary response
- Indicate 💡past infection
IgG
- 💡First produced in response to an antigen
- Most efficient immunoglobulin in 💡agglutination, 💡complement fixation and 💡antigen antibody reactions
- Defense in bacteria and viruses
- Indicate 💡acute or current infection
IgM
- 💡Mucosal immunity
* Milk, saliva, tears (Respiratory, GIT, GUT)
IgA
- Parasitic Infections
* Allergic Reactions
IgE
IMMUNE SYSTEM
A. GENERAL LYMPHOID ORGANS
B. PERIPHERAL LYMPHOID ORGANS
GENERAL LYMPHOID ORGANS
THYMUS
BONE MARROW
💡Maturation and 💡education site of lymphoid cells allowing T cells to develop the important attribute known as 💡self-tolerance
THYMUS
Site of origin of red blood cells, white blood cells and platelets
BONE MARROW
PERIPHERAL LYMPHOID ORGANS
LYMPH NODES
SPLEEN
MUCOSA-ASSOCIATED LYMPHOID TISSUE (MALT)
Small bean shaped structures lying along the course of lymphatic and are aggregated in the neck, axillae, groins and para-aortic region
LYMPH NODES
Located in the upper left quadrant of the abdomen
SPLEEN
o Tonsils
o Adenoids (Waldeyer’s ring)
o Peyer’s patches
• Organized to concentrated antigens, APC and lymphocytes for adaptive immune responses
MUCOSA-ASSOCIATED LYMPHOID TISSUE (MALT)
o Protection produce by the 💡person’s own immune system
o 💡Lifetime
Active Immunity
o Protection 💡transferred from another animal or human
Passive Immunity
o The 💡process whereby a person is made💡 resistant to an infectious disease, typically usually by the administration of a vaccine.
o 💡Stimulate the immune system to develop long-lasting immunity against antigens from specific pathogens
o Elicit an immune response against an antigen so that when the individual is again exposed to the antigen, a much stronger immune response will result.
IMMUNIZATION
It stimulate the immune system to develop long-lasting immunity against antigens from specific pathogens.
Vaccines
o Vaccines promote health
o Vaccines have an expansive reach: they protect individuals, communities, and entire populations
o Vaccines have rapid impact: the impact of most vaccines on communities and populations is almost immediate
o Vaccines save lives and costs
VACCINATION
IMMUNIZING AGENTS
o Immunoglobulins
• Antibodies
Antisera
o Materials prepared from animals
💡Slower response with 💡lower level of immunity
Primary Immune Response
Exposed to a certain antigens there will be 💡immediate response and 💡higher level of immunity.
Secondary Immune Response
The main vaccine preventable diseases targeted by the EPI and the associated vaccines
See anki
💡Immuno-biological substance designed to produce specific protection against a given disease.
VACCINES
VACCINES Types:
LIVE ATTENUATED VACCINE INACTIVATED VACCINE SUBUNIT VACCINE TOXOID VACCINE RECOMBINANT VACCINE
o Attenuated (💡weakened) form of the “wild” virus or bacterium
o 💡Must replicate to produce an immune response
o Immune response virtually 💡identical to natural infection
o Usually produce immunity with 💡one dose*
o 💡Severe reactions possible
o Interference from circulating antibody
o 💡Fragile – must be stored and handled carefully
LIVE ATTENUATED VACCINE
LIVE ATTENUATED VACCINE Examples:
o Viral: • Measles • Rotavirus • Oral polio o Bacterial: • BCG
Five WHO recommended vaccines using LAV Technology
See anki
o 💡Inactivated microorganisms grown in a culture
o 💡Cannot replicate
o Less affected by circulating antibody than live vaccines
o Always require 💡multiple doses
o Immune response mostly 💡humoral
o 💡Antibody titer diminish with time
o May require periodic supplemental 💡booster doses
INACTIVATED VACCINE
Adverse reactions associated with inactivated whole-cell vaccines
SEE anki
INACTIVATED VACCINE
SEE anki
o 💡No live component of the pathogen
o Only 💡antigenic parts
SUBUNIT VACCINE
SUBUNIT VACCINE
SEE anki
SUBUNIT VACCINE Types:
PROTEIN BASED SUBUNIT VACCINES
POLYSACCHARIDE SUBUNIT VACCINES
CONJUGATE SUBUNIT VACCINES
Uses a specific 💡isolated protein of the pathogen
o May bind to different antibodies than the protein of the pathogen
Examples:
o 💡Acellular pertussis (aP) – inactivated pertussis toxin
o 💡Hepatitis B – HBsAg of purified plasma of Infected Individuals
PROTEIN BASED SUBUNIT VACCINES