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INTESTINAL PARASITE SURVEY IN MARSHALL ISLANDS
421
TABLE 2
Relationship of eostnophilia to infection with intestinal helminths
Exposed population
Organism
Eosinophilia
(40 cases)
Nonexposed population
{No eosinophilia]
(29 cases)
Eosinophilia
(4 cases}
|
}
Combined population
{No eosinophilia’
(26 cases)
Eosinophilia
(74 cases)
~_
T. trichtura ooo. eae.
Hookworm. ...........
No belmiuths.......----
14 (35.0}*
1 (2.5)
26 (65.0)
7 (24.1)
1 (3.4)
21 (72.4)
17 (50.0)
§ (14.7)
13 (38.2)
jNe eosinophilia
(55 cases)
'
1
7 (26.9)
2 (7.7)
19 (73.1)
31 (41.9)
6 @.1)
39 (52.7)
14 (25.5)
3 (3,5)
40 (72.7)
*" Tue figures in parentheses are per cent.
TABLE 3
Relationship of age of tndividuals lo infection with intestinal parasites*
Age of individuals (yrs)
Organism
1-5 (43 cases)
E. histotytica.........
Eo colt. coca
EBL nena... eee,
G lamblia............
T. hominig...........
Hookworm...........
T. trichiura..........
No parasites.........
2
10
§
8
13
1
13
17
(4.6)T
(23.3)
(18.6)
(15.6)
(380.2)
(2.3)
(50.2)
(9.5)
6-12 (30 cases)
7
10
4
2
Il
1
19
3
(23.3)
(33.3)
(13.3)
(6.7)
(36.6)
(3.3)
(63.3)
(10.0)
13~20 (15 cases}
2
5
7
0
3
1
li
2
(13.3)
(33.3)
(46.7)
(20.0)
(6.7)
(73.3)
(13.3)
21-50 (56 cases)
|
t
|
15
20
18
1
17
7
9
11
(26.8)
(35.7)
(32.1)
(1.8)
(50.4)
(12.5)
(16.1)
(19.6)
:
Spdolder
&
14
9
1
&
0
9
5
(17,2)
(48.3)
(31.0)
(3.4)
(27.6)
(31.0)
(17.2)
* Eight individuals whose ages were unknown are omitted frum this table.
t Figures in pareatheses are per cent.
able. Of these, 34 showed eosinophilia, 26 did
not, When the incidence of Trichurzs was determined in these groups, it was found that in both
exposed and nonexposed populations more of
the eosinopbila cases had Trichuris infections
than those with no eosinophilia (Table 2). However, about half of the cases with eosinophilia
showed no helminth infections at all.
In 11 of 17 Trichuris infections only one egg
was found in the Beaver preperation, The number of eggs in the remaining 6 ranged from 2 to 6.
Similarly, the hookworm burden waslow.
Because infection rates for both exposed and
nonexposed groups were similar, the following
analyses are based on pooled results for both
sTOUDs,
Table 3 presents the age distribution of infections found. E. Atstolytica was found in 4.6%
of 43 children 5 years old or younger. In the 6
to 12 year group, detected infections went up
to 23.3%. The highest incidence, 26.8%, was
found among adults in the 21 to 50 age group.
The other two intestinal amebas, Entamoeba
colt and Endolinar nana, occurred much more
frequently in the youngest ave group, 23.3 and
18.6%, respectively, and both showed increases
among the older individuals. Among flagellates,
the Giardia lamblia incidence was highest in the
young children and almost nonexistent after
the age of 12. 7. homints showed a high,relatively
uncbanged incidencein all age groups.
Of the two helminths found, hookworm showed
a steady rise in incidence with age up to 50,
from 2.3 to 12.5%. No infections were found
after 50. T. trickiura occurred in 30.2% of very
young children, 5 years or less, and in 66.7%
of the 6 to 20 year group. In the older age group,
21 to 50, the incidence dropped to 16.1%, nsing
again, alter 50, to 381%.
Table 4 shows a breakdown of infections according to sex, with a further division into two
groups, less or more than 13 years of age. Division into the two age groups was made on the
basis that both sexes probably engaged in similar
‘