NR503 - EPIDEMIOLOGY MIDTERM
EXAM QUESTIONS WITH COMPLETE
SOLUTIONS
validity - Answer- ability to distinguish between who has disease and who does not
sensitivity - Answer- ability of test to identify correctly those who have the disease
specificity - Answer- ability of test to identify correctly those who do not have the
disease
attack rate - Answer-no. of people who became ill / no. of people who participated
direct transmission - Answer-person-to-person contact
indirect transmission - Answer-common vehicle, vector
epidemic curve - Answer-distribution of times of onset of disease
immunity - Answer-ability of an organisms to resist a particular infection/toxin by action
of specific antibodies/sensitized WBCs
epidemic - Answer-widespread occurrence of an infectious disease in
community/particular time
endemic - Answer-disease/condition regularly found among particular people/in certain
area
herd immunity - Answer-resistance to spread of contagious disease within population
that results if a sufficient high proportion of individuals are immune to disease,
especially through vaccination
common-vehicle exposure - Answer-an outbreak occurs in group people who have
shared common inanimate vehicle
single exposure - Answer-(1) explosive; sudden, rapid increase in number of cases
(2) cases limited to people who share common exposure; self-evident - first wave of
cases would not expect disease to develop in people not exposed
(3) food-borne outbreak - cases rarely occur in persons who acquire disease from
primary case
incubation period - Answer-interval from receipt of infection to time of onset of clinical
illness
EXAM QUESTIONS WITH COMPLETE
SOLUTIONS
validity - Answer- ability to distinguish between who has disease and who does not
sensitivity - Answer- ability of test to identify correctly those who have the disease
specificity - Answer- ability of test to identify correctly those who do not have the
disease
attack rate - Answer-no. of people who became ill / no. of people who participated
direct transmission - Answer-person-to-person contact
indirect transmission - Answer-common vehicle, vector
epidemic curve - Answer-distribution of times of onset of disease
immunity - Answer-ability of an organisms to resist a particular infection/toxin by action
of specific antibodies/sensitized WBCs
epidemic - Answer-widespread occurrence of an infectious disease in
community/particular time
endemic - Answer-disease/condition regularly found among particular people/in certain
area
herd immunity - Answer-resistance to spread of contagious disease within population
that results if a sufficient high proportion of individuals are immune to disease,
especially through vaccination
common-vehicle exposure - Answer-an outbreak occurs in group people who have
shared common inanimate vehicle
single exposure - Answer-(1) explosive; sudden, rapid increase in number of cases
(2) cases limited to people who share common exposure; self-evident - first wave of
cases would not expect disease to develop in people not exposed
(3) food-borne outbreak - cases rarely occur in persons who acquire disease from
primary case
incubation period - Answer-interval from receipt of infection to time of onset of clinical
illness
