8th grade ch. 5 sec. 3 preventing infectious diseases
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Ch. 5 Ch. 5 Sec. 3 Sec. 3
Preventing Preventing Infectious DiseasesInfectious Diseases
immunityimmunitybody’s ability to body’s ability to destroy pathogens destroy pathogens before they can before they can cause diseasecause disease
2 kinds of immunity
1. active
2. passive
1. active immunity1. active immunity1.1. when person’s own immune when person’s own immune
system produces antibodies in system produces antibodies in response to presence of response to presence of pathogenpathogen
2.2. vaccination (immunization)vaccination (immunization) usually lasts for many years- usually lasts for many years-
sometimes for lifesometimes for life
vaccinationvaccination process by which harmless process by which harmless
antigens- deliberately introduced antigens- deliberately introduced into person’s body into person’s body creates creates active immunityactive immunity
given by injection, mouth, nasal given by injection, mouth, nasal sprayspray
Franklin D. Roosevelt in a wheelchairFranklin D. Roosevelt in a wheelchair
2. passive immunity2. passive immunity occurs when antibodies that occurs when antibodies that
fight pathogen come from fight pathogen come from another source rather than another source rather than from person’s own bodyfrom person’s own body
only lasts few monthsonly lasts few months
chemical that kills chemical that kills bacteria or slows bacteria or slows their growth their growth without harming without harming body cellsbody cells
does NOT work on does NOT work on virusesviruses
active active immunityimmunity
when person’s own when person’s own immune system immune system produces antibodies produces antibodies in response to in response to presence of pathogenpresence of pathogen
passive passive immunityimmunityoccurs when antibodies occurs when antibodies
that fight pathogen that fight pathogen come from another come from another source rather than from source rather than from person’s own bodyperson’s own body
passive passive immunityimmunity
•Only lasts few Only lasts few monthsmonths
active active immunityimmunity
•can last a lifetimecan last a lifetime
active active immunityimmunity
when person’s own when person’s own immune system immune system produces antibodies produces antibodies in response to in response to presence of pathogenpresence of pathogen
passive passive immunityimmunity
occurs when antibodies occurs when antibodies that fight pathogen that fight pathogen come from another come from another source rather than from source rather than from person’s own bodyperson’s own body
passive immunitypassive immunity
passive passive immunityimmunity
•only lasts few only lasts few monthsmonths
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