Curve Day

In this case, the last case is December 13, and the incubation period is 10 days. You should count back to December 3. After analyzing the epi curve, we determined the first case occurred on December 9, the peak of the outbreak on December 10, and the last case occurred on December With the described methods, we have determined the. Using these range of dates, we have can determine the most likely period of exposure for this outbreak is December Investigators will focus on this time period when searching for the exposure that resulted in this outbreak.

Notice in the example we just completed the interval on the x-axis 1 day.

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Some epi curves will use intervals of multiple days, weeks, or even months. The interval depends on the time frame that cases occurred. Always be sure to look at the interval so that you interpret the epi curve appropriately. Walk through the steps to determine the most likely period of exposure for a point source outbreak of Hepatitis A in Alabama. The incubation range for Hepatitis A is days and has an average incubation of days. Use an average incubation period of 28 days.

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Because the cases are spread over multiple months, the x-axis is divided into 4-day intervals, starting on the day noted. Count back the average incubation period from the peak. Select the appropriate area of the graph. The average incubation period for hepatitis A is 28 days.

Select the correct answer below. Identify the earliest case in the outbreak and count back the minimum incubation period. What is the approximate date? Identify the last case in the outbreak and count back the maximum incubation period. What is this date? Based on the information above, what is the most likely period of exposure?

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Select the correct answer. You have analyzed an epi curve to determine the likely period of exposure that led to the outbreak. What an Epi Curve Can Tell You An epi curve is a visual display of the onset of illness among cases associated with an outbreak. You can learn a lot about an outbreak from an epi curve, such as The outbreak's time trend, which is the distribution of cases over time Outliers, that is, cases that stand apart from the overall pattern General sense of the illness magnitude Inferences about the outbreak's mode of spread The most likely period of exposure In a point source outbreak of a known disease, you also can use the epi curve to identify the most likely time period of exposure that led to the outbreak.

Point Source Outbreak Persons are exposed to the same source over a brief time, such as through a single meal or at an event. Incubation Period To determine the most likely period of exposure for an outbreak, you need to know the average incubation period for the disease and the range of incubation periods, which are the minimum and maximum reported incubation periods. Determining the Period of Exposure The following steps will allow you to determine the most likely period of exposure for a point source outbreak based on the epi curve.

Identify the peak of the outbreak, which is the time period then the largest number of cases occurred. Count back from the peak, the average incubation period for disease. Determining the Period of Exposure Let's look at an example and walk through the steps to determine the most likely period of exposure.

The Keeling Curve

Samples for growth hormone levels are taken at 9am, 11am, 1pm, 3pm and 5pm. Your doctor has referred you to have a growth hormone curve. This is performed over a day and will tell us if your levels of growth hormone are satisfactory and that your acromegaly is under control. During the test blood samples will be taken at two hourly intervals. We will be taking a sample of blood at 9am, 11am, 1pm, 3pm and 5pm. You will be resting in a reclining chair throughout the test. You may eat and drink as normal on the day of the test. If you are in the unit over the lunch period you will be offered something to eat.

Growth hormone day curve - endocrinology diagnosis, treatment and management

You do not have to stay in the unit for the whole day but you may do so if you choose. You should expect your stay at the hospital to last until 5pm. You may wish to bring a book or magazine to read. You may bring someone to stay with you during the test but there is not enough space for more than one person.

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Children are discouraged, as this can be disruptive to other patients. However, if this poses a particular problem for you please discuss this with the senior nurse in the unit.