During a six-month period, 239 cases of pneumonia occurred in a town of 300 people. a clinical case was defined as fever ≥ 39°c lasting > 2 days with three or more symptoms (i. e., chills, sweats, severe headache, cough, aching muscles/joints, fatigue, or feeling ill). a laboratory-confirmed case was defined as a positive result for antibodies against coxiella burnetii. before the outbreak, 2000 sheep were kept northwest of the town. of the 20 sheep tested from the flock, 15 were positive for c. burnetii antibodies. wind blew from the northwest, and rainfall was 0.5 cm compared with 7 to 10 cm during each of the previous three years. this situation is an example ofa) human reservoirs. b) a zoonosis. c) a vector. d) a focal infection.

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.  

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.