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MANUAL OF NAVAL PREVENTIVE MEDICINE
Table 1-13. Example of incubation periods grouped by two hour
intervals for a staphylococcal food poisoning
outbreak
Incubation
Number of
Period
Cases
First 2
2
Hours
2nd-3rd
12
Hours
4th-5th
5
Hours
6th-7th
0
Hours
8th-9th
2
Hours
10th-11th
1
Hours
12th-13th
1
Hours
Table 1-14. Example of food-specific attack rates for an outbreak
investigation
Persons Exposed
Persons Not Exposed
(ate food)
(did not eat food)
Food Item
Total
# Ill
% Ill
Total
# Ill
% Ill
Difference
in % Ill
Potato
246
192
78.0
58
4
6.9
71.1
salad
Tomatoes
253
127
50.2
51
19
37.3
12.9
Ice cream
201
98
48.8
103
48
46.6
2.2
Beans
258
129
50.0
46
17
37.0
13.0
Ham
230
108
47.0
74
38
51.4
-4.4
Crab Cakes
235
124
52.8
69
22
31.9
20.9
144


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