Basic(201-250)

A primary procedure for diagnosis of fecal parasites is a stained smear of feces. For some parasitic infections, however, other specimens may be more productive. G. Lamblia is best diagnosed by

E. Histolytica infection is best diagnosed by

The best method for the detection of Strongyloides larvae is

Ascaris are best observed in human specimens by which one of the following?

A butcher, who is fond of eating raw hamburger, develops chorioretinitis; a Sabin-Feldman dye test is positive. This patient is most likely infected with

A fur trapper complains of sore muscles, has swollen eyes, and reports eating bear meat on a regular basis. He is at risk for

A student from Phnom Penh has had abdominal pain for 2 years; he is used to swim in Sekong/Stung Treng river. Which of the following should you be in your differential diagnosis?

A teenager who works in a dog kennel after school has had a skin rash, eosinophilia, and an enlarged liver and spleen for 2 years. The most likely cause of this infection is

Certain parasites are found most commonly in particular body contents. A helminth that is naturally transmitted by ingestion of pork, bear, or walrus meat could be detected in

A tissue-dwelling trematode that may be found in feces can also be detected in

A parasite resembling malaria that infects both animals and humans and is carried by the same tick that transmits B. burgdorferi (the bacterium that causes Lyme disease) would most likely be observed in

Finding HBsAg positive and HBeAg positive reflects

Finding HBsAg positive, HBeAg positive, and IgM core antibody pos- itive reflects

Finding antibodies to HBsAg reflects

The association between low birth weight and maternal smoking during pregnancy can be studied by obtaining smoking histories from women at the time of the first prenatal visit and then subsequently assessing and assigning birth weight at delivery according to smoking histories. What type of study is this?

Which of the following measures is used frequently as a denominator to calculate the incidence rate of a disease?

Among women aged 18 to 34 in a community, weight is normally distributed with a mean of 52 kg and a standard deviation of 7.5 kg. What percentage of women will have a weight over 59.5 kg?

In nine families surveyed, the numbers of children per family were 4, 6, 2, 2, 4, 3, 2, 1, and 7. The mean, median, and mode numbers of children per family are, respectively,

In the study of the cause of a disease, the essential difference between an experimental study and an observational study is that in the experimental investigation

In a study of the cause of lung cancer, patients who had the dis ease were matched with controls by age, sex, place of residence, and social class. The frequency of cigarette smoking was then compared in the two groups. What type of study was this?

The incidence rate of lung cancer is 120/100,000 person years for smokers and 10/100,000 person years for nonsmokers. The prevalence of smoking is 20% in the community. What is the relative risk of developing lung cancer for smokers compared with nonsmokers?

A research team wishes to investigate a possible association between smokeless tobacco and oral lesions among professional baseball players. At spring training camp, they ask each baseball player about current and past use of smokeless tobacco, cigarettes, and alcohol, and a dentist notes the type and extent of the lesions in the mouth. What type of study is this?

You are preparing a report to present to the MoH on the declining rates of gonorrhea in your province in both men and women over the last 10 years. Which type of graph would best illustrate the data?

Select an appropriate measure of frequency that describes the number of deaths in the first 28 days of life per 1000 live births in 1 year.

Select an appropriate measure of frequency that describes the number of deaths under the age of 1 year per 1000 live births in 1 year.

Select an appropriate measure of frequency that describes the number of deaths between the ages of 28 days and 11 months per 1000 live births in 1 year

Comparison of the prevalence of hepatitis B surface antigen (HBsAg) in medical and dental students. Select an appropriate statistical test to analyze the data that match above description

Death occurs in 10% of cases of meningococcal meningitis. Choose statement below that match rate above.

Approximately 9 people die each year in a country for every 1000 estimated to be alive. Choose statement below that match rate above.

Eighty percent of susceptible household contacts of a child with chicken pox develop this disease. Choose statement below that match rate above.

Children between the ages of 1 and 5 have an average of eight colds per year. Choose statement below that match rate above.

Each individual of the total group has an equal chance of being selected. Select the correct term that match above description of a sampling procedure.

Households are selected at random, and every person in each household is included in the sample. Select the correct term that match above description of a sampling procedure.

A new test for chlamydial infections of the cervix is introduced. Half of the women who are tested have a positive test. Compared with the gold standard of careful cultures, 45% of those with a positive test are infected with chlamydia, and 95% of those with a negative test are free of the infection. Match with the correct percentage with the epidemiologic terms, Sensitivity of the test.

A new test for chlamydial infections of the cervix is introduced. Half of the women who are tested have a positive test. Compared with the gold standard of careful cultures, 45% of those with a positive test are infected with chlamydia, and 95% of those with a negative test are free of the infection. Match with the correct percentage with the epidemiologic terms, Specificity of the test.

A new test for chlamydial infections of the cervix is introduced. Half of the women who are tested have a positive test. Compared with the gold standard of careful cultures, 45% of those with a positive test are infected with chlamydia, and 95% of those with a negative test are free of the infection. Match with the correct percentage with the epidemiologic terms, Prevalence of chlamydial infection in that community. A new test for chlamydial infections of the cervix is introduced. Half of the women who are tested have a positive test. Compared with the gold standard of careful cultures, 45% of those with a positive test are infected with chlamydia, and 95% of those with a negative test are free of the infection. Match with the correct percentage with the epidemiologic terms, Predictive value of a positive test.

A new test for chlamydial infections of the cervix is introduced. Half of the women who are tested have a positive test. Compared with the gold standard of careful cultures, 45% of those with a positive test are infected with chlamydia, and 95% of those with a negative test are free of the infection. Match with the correct percentage with the epidemiologic terms, Predictive value of a negative test

Choose the type of measurement scale for Birth Weight.

Choose the type of measurement scale for Type of medical specialty.

Choose the type of measurement scale for Year of birth.

Which of the following vaccines is CONTRAINDICATED during pregnancy?

A 32yearold farmer presents to the emergency room with a crushing injury of the index finger and thumb that occurred while he was working with machinery in his barn. Records show that he received three doses of Td in the past, and that his last dose was given when he was 25 years old. In addition to proper wound cleaning and management, which of the following is the most appropriate prevention intervention?

An 18yearold sexually active college student presents with complaints of lower abdominal pain and irregular bleeding for five days. She has no fever. She uses oral contraceptives as method of birth control. Upon examination, the cervix is friable; there is cervical motion tenderness and adnexal tenderness. The pregnancy test is negative. Which is the most likely etiologic agent responsible for these findings?

Which patient is most likely to become a chronic carrier following an acute episode of hepatitis B?

The medical evaluation of a 25yearold intravenous drug user reveals elevated liver enzymes and a positive antiHBsAg. The most likely cause of the abnormal liver profile is hepatitis

The time interval between entry of an infectious agent into a host and the onset of symptoms is called

Rabies, psittacosis, salmonellosis. Select the most common described mode of transmission with the above disease

Measles, tuberculosis, influenza. Select the most common described mode of transmission with the above disease

Select the most effective or principal means of control for Typhoid fever.

Select the most effective or principal means of control for Tetanus.