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The elderly and waterborne Cryptosporidium infection: gastroenteritis hospitalizations before and during the 1993 Milwaukee outbreak.

Naumova EN, Egorov AI, Morris RD, Griffiths JK - Emerging Infect. Dis. (2003)

Bottom Line: Before the outbreak, the rate of such events increased with age in the elderly (p</=0.001), suggesting that the elderly are at an increased risk.A pronounced second wave of these illnesses in the elderly peaked at 13 days.This wave represented approximately 40% of all excess cases in the elderly.

View Article: PubMed Central - PubMed

Affiliation: Department of Family Medicine and Community Health, Tufts University School of Medicine, Boston, Massachusetts 02111, USA. elena.naumova@tufts.edu

ABSTRACT
We used the Temporal Exposure Response Surfaces modeling technique to examine the association between gastroenteritis-related emergency room visits and hospitalizations in the elderly and drinking water turbidity before and during the 1993 Milwaukee waterborne Cryptosporidium outbreak. Before the outbreak, the rate of such events increased with age in the elderly (p

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Related in: MedlinePlus

The fragment of the time series of daily rates of gastroenteritis-related emergency room visits and hospitalizations among Milwaukee elderly in the south and central water supply areas and daily water turbidity at the south treatment plant. The outbreak period (March 28, 1993–April 24, 1993) is indicated by blue lines; the day of announcement of the outbreak by the Milwaukee Health Department (April 7, 1993) is indicated by a green star.
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Figure 3: The fragment of the time series of daily rates of gastroenteritis-related emergency room visits and hospitalizations among Milwaukee elderly in the south and central water supply areas and daily water turbidity at the south treatment plant. The outbreak period (March 28, 1993–April 24, 1993) is indicated by blue lines; the day of announcement of the outbreak by the Milwaukee Health Department (April 7, 1993) is indicated by a green star.

Mentions: The time-series analysis employed turbidity data from the south plant and GIH events data from the south and central areas, which were supplied completely or partially by this plant. The mean (± standard deviation) daily rates of GIH events in these areas before and during the outbreak were 0.74 (±0.94) and 2.48 (±2.07), respectively. Before the outbreak, the daily rate did not exceed 2.5 cases per day in 98% of days. However, during the outbreak, in 7 of 28 days, the daily rate was >2.5 cases per day. Before March 1993, daily turbidity never exceeded 0.25 NTU. Time series of daily rates of GIH events in the south and central areas and daily maximum effluent turbidity for a 60-day period, including the outbreak, are shown in Figure 3.


The elderly and waterborne Cryptosporidium infection: gastroenteritis hospitalizations before and during the 1993 Milwaukee outbreak.

Naumova EN, Egorov AI, Morris RD, Griffiths JK - Emerging Infect. Dis. (2003)

The fragment of the time series of daily rates of gastroenteritis-related emergency room visits and hospitalizations among Milwaukee elderly in the south and central water supply areas and daily water turbidity at the south treatment plant. The outbreak period (March 28, 1993–April 24, 1993) is indicated by blue lines; the day of announcement of the outbreak by the Milwaukee Health Department (April 7, 1993) is indicated by a green star.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2957964&req=5

Figure 3: The fragment of the time series of daily rates of gastroenteritis-related emergency room visits and hospitalizations among Milwaukee elderly in the south and central water supply areas and daily water turbidity at the south treatment plant. The outbreak period (March 28, 1993–April 24, 1993) is indicated by blue lines; the day of announcement of the outbreak by the Milwaukee Health Department (April 7, 1993) is indicated by a green star.
Mentions: The time-series analysis employed turbidity data from the south plant and GIH events data from the south and central areas, which were supplied completely or partially by this plant. The mean (± standard deviation) daily rates of GIH events in these areas before and during the outbreak were 0.74 (±0.94) and 2.48 (±2.07), respectively. Before the outbreak, the daily rate did not exceed 2.5 cases per day in 98% of days. However, during the outbreak, in 7 of 28 days, the daily rate was >2.5 cases per day. Before March 1993, daily turbidity never exceeded 0.25 NTU. Time series of daily rates of GIH events in the south and central areas and daily maximum effluent turbidity for a 60-day period, including the outbreak, are shown in Figure 3.

Bottom Line: Before the outbreak, the rate of such events increased with age in the elderly (p</=0.001), suggesting that the elderly are at an increased risk.A pronounced second wave of these illnesses in the elderly peaked at 13 days.This wave represented approximately 40% of all excess cases in the elderly.

View Article: PubMed Central - PubMed

Affiliation: Department of Family Medicine and Community Health, Tufts University School of Medicine, Boston, Massachusetts 02111, USA. elena.naumova@tufts.edu

ABSTRACT
We used the Temporal Exposure Response Surfaces modeling technique to examine the association between gastroenteritis-related emergency room visits and hospitalizations in the elderly and drinking water turbidity before and during the 1993 Milwaukee waterborne Cryptosporidium outbreak. Before the outbreak, the rate of such events increased with age in the elderly (p

Show MeSH
Related in: MedlinePlus