diseases Flashcards
chapter four
communicable diseases
Diseases for which biological agents or their products are the cause and that are transmissible from one individual to another
noncommunicable diseases
Illnesses that cannot be transmitted from one person to another
acute
diseases in which peak severity of symptoms occurs and subsides within three months
chronic
diseases or conditions in which symptoms last longer than three months
infectability
ability of a biological agent to enter and grow in a host
define agent, host, and environment
agent: cause of disease
host: A susceptible person or organism invaded by an infectious agent
Environment: Factors that inhibit or promote disease transmission
Pathogenicity
Capability of a communicable agent to cause disease in a susceptible host
step-by-step model of infection
pathogen
reservoir (host #1)
portal of exit
transmission (direct or indirect)
portal of entry (host #2)
establishment of infection
zoonoses
diseases for which reservoir resides in animal population
Anthroponoses
Diseases for which humans are the only known reservoir
direct transmission
immediate transfer of disease agent between infected and susceptible individuals
indirect transmission
transmission involving an intermediate step (airborne, vehicleborne, vectorborne, biological) (vehicles: nonliving objects by which agents are transfered)
multi-causation disease model (host, choices, environment)
host: inalterable, unique genetic endowment
personality, beliefs, behavioral choices: impact host
complex environment: exposes the host to risk factors
common non communicable diseases
cancer (second leading cause of death in US), heart disease (48%, leading cause of death in US), chronic obstructive pulmonary disease, diabetes, liver disease, and cirrhosis
levels of prevention
primary: Forestall onset of illness or injury during the pathogenesis period
secondary: early diagnosis and prompt treatment before the disease becomes advanced and disability severe
tertiary: aimed at rehabilitation following significant pathogenesis; retain, reeducate, rehabilitate