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Case-report Data & Graphs


Number of Case-reports of Primary Amebic Meningoencephalitis by Year: United States, 1962-2012

a green bar graph on a white background showing the number of case reports of PAM by year, United States, 1962-2011. N=123; year of exposure unknown for one case.

Number of case reports of PAM by year, United States, 1962-2012. N=128; year of exposure unknown for one case.

Number of Case Reports by Year
YearNumber of Case-reports
19622
19630
19640
19651
19662
19672
19681
19693
19702
19713
19721
19732
19741
19751
19760
19773
19786
19792
19808
19811
19821
19833
19842
19852
19861
19876
19882
19892
19901
19915
19921
19930
19942
19956
19961
19970
19985
19991
20003
20015
20026
20031
20040
20053
20062
20076
20082
20093
20104
20115
20125
Total:128

Number of Case-reports of Primary Amebic Meningoencephalitis by Age Group and Gender: United States, 1962-2012

Purple graph on a white background showing the number of case-reports of Primary amebic meningoencephalitis by age group and gender, from 1962-2011. N=123.

Cases by gender and age group in years from 1962-2012. N=128. Median age = 12; ~80% male

Number of Case-reports by Age Group and Gender
Age Group (yrs)MaleFemale
Under 101
1-483
5-9278
10-14386
15-19116
20-2461
25-2930
30-3440
35-3901
40-4400
45-4920
50-5410
55-5901
>=6010
Total10127

Number of Case-reports of Primary Amebic Meningoencephalitis by Month of Illness Onset and Probable Water Exposure: United States, 1962-2012

Multi-colored graph showing the number of case-reports of primary amebic meningoencephalitis, by month of illness onset and probable water exposure in the United States, from 1962-2011. Purple indicates lakes, ponds, reservoirs; light purple indicates canals, ditches, and puddles; rust-red indicates a river or stream; yellow indicates geothermally heated water; green indicates tap water, black indicates swimming pools, and gray indicates unknown or multiple locations.

Number of case-reports of primary amebic meningoencephalitis, by month of illness onset and probable water exposure in the United States, from 1962-2012. N=128. Month of illness onset unknown for 11 cases. Of those case-reports missing the month of exposure, probable water exposures included lake, pond, or reservoir (N=5), unknown/multiple (N=5), and geothermal water (N=1).

* no information is available on the design, maintenance, or operation of these pools.

** Water was forced up the nose during use.

Case-reports by Month of Illness Onset and Probable Water Exposure
MonthJFMAMJJASONDTotal
Lake, pond, reservoir     1293292  73
Canal, ditch, puddle   1  141   7
River, stream    1 54    10
Geothermally heated water   11  1 1  4
Tap water**     11 121 6
Swimming pool*       2    2
Unknown/Multiple     26331  15
Total   22442461461 117

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