How is 'attack rate' defined in the context of an

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Epidemiology NCLEX Questions Questions

Question 1 of 5

How is 'attack rate' defined in the context of an outbreak?

A. The total number of existing cases of a disease B. The proportion of people who die from a disease C. The proportion of people who become ill after exposure to the disease D. The number of new cases of a disease

Correct Answer: C

Rationale: Attack rate (C) is illness among exposed (e.g., 20% in food poisoning). A is prevalence, B is CFR, D is incidence.

Question 2 of 5

Which is the most common site of nosocomial infections?

A. Surgical wound B. Respiratory tract C. Skin D. Urinary tract

Correct Answer: D

Rationale: Urinary tract infections (often catheter-related) are most common.

Question 3 of 5

Which of the following epidemiologic statements about gastric cancer is true?

A. The incidence of gastric cancer is higher in Japan than in the U.S. B. Annual mortality for gastric cancer has been increasing over the last 40 years in the U.S. C. The incidence of gastric cancer is higher in smokers D. The incidence in women is twice that in men

Correct Answer: A

Rationale: Japan has higher rates (diet, H. pylori); others false.

Question 4 of 5

Studies of estimated mortality related to birth control in premenopausal women have shown that

A. at all ages, mortality is greater among women using no contraception than among women using oral contraceptives B. the mortality among women ages 40 to 44 associated with the use of abortion is less than one-twentieth that associated with birth C. death rates associated with the use of intrauterine devices (IUDs) are about ten times higher in older than in younger women D. smokers who use birth control pills are at about a 15 percent higher mortality risk

Correct Answer: A

Rationale: Pregnancy risks exceed OCP risks; B-D speculative, E false (older women higher).

Question 5 of 5

Primary hepatocellular carcinoma (hepatoma) is

A. more common in persons with chronic liver disease B. associated with the consumption of raw meat C. responsible for 2 to 4 percent of all deaths from cancer in Africa D. associated with cigarette smoking

Correct Answer: A

Rationale: Chronic liver disease (e.g., HBV, HCV) is key; others false.

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How is 'attack rate' defined in the context of an outbreak?

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Epidemiology NCLEX Questions Questions

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