The p-value helps you determine the public health significance of an association between a food and an illness. The p-value is not affected by study size. A p-value of 0.05 means that there is a 5 in 100 probability that the observed association between the food and illness is due to chance alone. ANSWER: D. A p-value of 0.05 means that there is a 5 in 100 probability that the association between the food and illness that was observed in the epidemiologic study is due to chance alone. The p-value indicates the role that chance plays in the study findings. It is the probability of finding an association between an exposure and a disease (as strong as the one observed) due to chance alone. Only epidemiologists should interpret results from epidemiologic studies. True ANSWER: B. False. All outbreak investigation team members should be able to interpret measures of association and p-values. They should also routinely scrutinize (and question) the results of epidemiologic studies. MODULE 6 Which of the following causative agents tend to have the longest incubation period? Preformed toxins Viruses Bacteria Parasites ANSWER: D. Parasites. Illnesses due to preformed toxins have short incubation periods, often measured in terms of minutes or hours. Illnesses due to infections have incubation periods that are relatively long, often measured in terms of days as compared to hours or minutes for intoxications. Gastrointestinal illnesses due to parasites, in general, have the longest incubation periods, ranging from 1-4 weeks. Most foods can be associated with a variety of causative agents. True ANSWER: A. True. Certain causative agents are associated with certain foods because the foods provide adequate conditions for contamination, survival, and proliferation of the microorganism. Most foods, however, can be contaminated with a variety of different causative agents and more than one food can transmit most causative agents. The following are true statements stool specimens collected during a foodborne disease outbreak EXCEPT Stool is the specimen of choice for most causative agents.
The p-value helps you determine the public health significance of an association between a food and an illness. The p-value is not affected by study size. A p-value of 0.05 means that there is a 5 in 100 probability that the observed association between the food and illness is due to chance alone. ANSWER: D. A p-value of 0.05 means that there is a 5 in 100 probability that the association between the food and illness that was observed in the epidemiologic study is due to chance alone. The p-value indicates the role that chance plays in the study findings. It is the probability of finding an association between an exposure and a disease (as strong as the one observed) due to chance alone. Only epidemiologists should interpret results from epidemiologic studies. True ANSWER: B. False. All outbreak investigation team members should be able to interpret measures of association and p-values. They should also routinely scrutinize (and question) the results of epidemiologic studies. MODULE 6 Which of the following causative agents tend to have the longest incubation period? Preformed toxins Viruses Bacteria Parasites ANSWER: D. Parasites. Illnesses due to preformed toxins have short incubation periods, often measured in terms of minutes or hours. Illnesses due to infections have incubation periods that are relatively long, often measured in terms of days as compared to hours or minutes for intoxications. Gastrointestinal illnesses due to parasites, in general, have the longest incubation periods, ranging from 1-4 weeks. Most foods can be associated with a variety of causative agents. True ANSWER: A. True. Certain causative agents are associated with certain foods because the foods provide adequate conditions for contamination, survival, and proliferation of the microorganism. Most foods, however, can be contaminated with a variety of different causative agents and more than one food can transmit most causative agents. The following are true statements stool specimens collected during a foodborne disease outbreak EXCEPT Stool is the specimen of choice for most causative agents.
APPENDIX_Quick_Quiz_Answers%20%281%29.docx