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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060 EISSN: 1678-8060
Vol. 91, Num. 5, 1996, pp. 551-554
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Mem Inst Oswaldo Cruz, Rio de Janeiro, Vol. 91(5),
551-554, Sep/Oct 1996,
Cryptosporidium sp. in Children Suffering from Acute
Diarrhea at Uberlandia City, State of Minas Gerais, Brazil
Margareth Leit o Gennari-Cardoso, Julia Maria Costa-Cruz^+,
Eliseo de Castro, Leda Maria FS Lima, Divino V Prudente
Departamento de Patologia, Centro de Ciencias Biomedicas,
Universidade Federal de Uberlandia, Av. Para 1720, 38400-902
Uberlandia, MG, Brasil
^+Corresponding author. Fax: 55-34-218.2333
Received 9 November 1995
Accepted 18 March 1996
Code Number: OC96101
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[TABLES AND FIGURES AT END OF TEXT]
This study's objective was to search for
Cryptosporidium sp. in diarrheic feces from children
aged zero to 12 years and cared for at medical units within
Universidade Federal de Uberlandia or at a private practice in
Uberlandia, State of Minas Gerais, Brazil, from September
1992 to August 1993. Three fecal samples preserved in 10%
formalin, were collected from 94 children. Oocyst
concentration was performed through Ritchie's (modified)
method and staining of fecal smears for each sample (total of
1128 slides) was done by the "Safranin/Methylene Blue" and the
"Kinyoun (modified)" techniques. The Hoffmann, Pons & Janer
method was also employed to look for other enteroparasites.
From 94 children, 4.26% excreted fecal Cryptosporidium
oocysts. The infection seemed to vary according to age: 5.08%
of patients aged zero to two years old; 33.33% of those aging
eight to ten years (P>0.05). Cryptosporidium appeared
in November, December and March, during the rainy season.
20.21% of the children harbored at least one enteroparasite
different from Cryptosporidium, mainly
Giardia intestinalis (12.77%). From
Cryptosporidium infected patients, two had only this
kind, another harbored Giardia intestinalis;
the last one hosted Strongyloides
stercoralis.
Key words: Cryptosporidium sp. -
cryptosporidiosis in children - intestinal parasites
Cryptosporidiosis is a parasitic zoonosis caused by protozoa
of the genus Cryptosporidium, studied mostly in
veterinary medicine, and only recently becoming a theme of
growing importance to human pathologists. The World Health
Organization (WHO 1980) has shown that from 30% to 40% of the
papers dealing with the etiology of acute diarrhea previous to
1980 could not establish its identity, and since that year
Cryptosporidium began to be included in the list of
diarrhea-producing parasites. Within fecal smears its oocysts
are not easily identifiable without the use of special
concentration techniques such as the ones developed by
Sheather (1923) or by Ritchie (1948), associated with staining
techniques, such as Ziehl-Neelsen's, modified (Henrichsen &
Pohlenz 1981), the Safranin/Methylene Blue (Baxby et al. 1984)
and the Auramin/Fuchsin (Casemore et al. 1984) techniques,
among others.
Cryptosporidiosis has an ample geographic distribution
(Cordell & Addiss 1994), with a higher frequency in developing
countries (Reinthaler 1989, Molbak et al. 1990, Rahman et al.
1990), but also with references of outbreaks in developed
nations (Jokipii et al. 1983, Alpert et al. 1986, Garcia-
Rodriguez et al. 1990, Assadamongkol et al. 1992).
The finding of this protozoon in Brazilian children has been
reported in the Northern Region (Loureiro et al. 1989),
Northeast Region (Weikel et al. 1985, Alves et al. 1989,
Silva et al. 1994 ) and Southeast Region (Mangini et al.
1992, Lomazi et al. 1993).
Because of the lack of data about this subject concerning the
city of Uberlandia (located in the State of Minas Gerais over
the main crossroads linking Brazil along the axles North-South
Belem and S o Paulo cities and West-East-Porto Velho and
Vitoria cities) this study's major goal was to look for
Cryptosporidium oocysts in diarrheic feces of children
aged from zero to 12 years and cared for in urban public and
private medical diagnose centres.
Materials and methods
Fecal sample collections -
In plastic vials containing 10% formalin, were collected three
fecal samples from each of 94 children suffering from acute
diarrhea and cared for in one of the following four diagnose
centres, the first three of which belong to the Universidade
Federal de Uberlandia (UFU): (1) the Sickroom of UFU's
Hospital; (2) the Central and Peripheral Polyclinic of the
same Hospital; (3) the First Aid Clinic of the same Hospital;
(4) a private pediatric practice. The collection period was
from September 1992 to August 1993.
Methods for detection of Cryptosporidium oocysts and
other enteric parasites -
The Ritchie (1948) concentration technique (modified),
associated to the staining methods of Safranin/Methylene Blue
(Baxby et al. 1984) and Kinyoun's modified (Moura & Oliveira
1985) were employed; four slides for each sample, two for each
staining method; the total number of examined slides was 1128.
For the detection of other enteric parasites the Hoffmann et
al. (1934) method was used.
Statistical analysis -
The data were analyzed through the chi^2 test.
Results
The patients distributed by the medical institutions which
cared for them -
From the 94 diarrheic children, 25 (26.60%) were from the
UFU's Hospital Sickroom, 15 (15.96%) from the same Hospital's
First Aid Clinic, 35 (37.27%) from its Polyclinic centres and
19 (20.21%) from one private pediatric practice.
Sex and ages -
57 (60.64%) were male and 37 (39.36%) were female children, 59
of the children had two years or less, 14 of them fell in the
category from above two years to four, 8 in the group above
four up to six, 7 in the class above six up to eigth, 3 above
eigth up to ten and 3 above ten and up to twelve.
Signs and symptoms observed in those 94 acutely diarrhea
children -
Diarrhea (100%), fever (60.64%), vomiting (46.81%), abdominal
pain (27.66%), dehydration (24.47%), abdominal inflammation
(6.38%) and undernourishment (27.66%).
Cryptosporidium infection -
From the 94 studied children in four (4.26%) were found fecal
oocysts of this genus in the three examined samples, by both
of two staining methods. According to the medical centres of
diagnosis, two of the above four cases came from UFU's
Hospital Sickroom and the other two from the private pediatric
practice (P>0.05). Concerning the patient's age, three
children (5.08%) were in the group aged from zero to two years
and one (33.33%) in the above eight and up to ten group
(P>0.05). All the observed children were from urban origin
and only one of them lived in an apartment building; all the
others dwelled in houses, of which only one was not linked to
the city's water pipeline network, obtaining water from a
private artesian well. Only one of the houses did not harbor
one pet dog. The two Cryptosporidium infected children
cared for in the private pediatric practice studied in private
primary schools; the other two cared for by the UFU's medical
services were not registered in any school or nursery.
Other enteric parasites -
From the 94 children fecal samples, 20.21% were found infected
with other parasitic organisms, such as: Giardia
intestinalis (12.77%), Entamoeba coli (3.19%),
Ascaris lumbricoides (2.13%), Hymenolepis nana
(2.13%), Strongyloides stercoralis (2.13%),
Trichuris trichiura (1.06%) and Endolimax nana
(1.06%).
Table presents the distribution of children affected with
acute diarrhea according to the criteria: medical centres
where feces were sampled, months when infections were
detected, patient's sex, age, colour of skin, clinical
aspects and associated enteroparasites along the period from
September 1992 to August 1993.
Discussion
This is the first approach to cryptosporidiosis in children
within Uberlandia community. Even if it is inserted in a
developing country where higher level of infection (21.31%)
has been found at Recife, State of Pernambuco (Alves et al.
1989), the infection percentage 4.26% registered in this paper
approaches those of develop nations (Jokipii et al.1983, Hunt
et al. 1984, Garcia-Rodriguez et al. 1990) a result that may
be due to the circumstance of the observations having been
made in one of this country's more developed part (Southeast
Region).
When only hospital cared children are included in the analysis
the infection percentage grows to 8%, a figure similar to the
ones reported by Sarabia-Arce et al. (1990) in Peru (10%) and
by Moodley et al. (1991) in Africa (9%).
Notwithstanding the fact that, when different papers on
cryptosporidiosis are compared, levels of infection may change
within the age group from zero to three years, this was the
age group carrying the highest percent level of infection in
the present study. It can be seen that this was also the age
group containing the largest number of children with acute
diarrhea. When this age group and their infected patients
becomes the basis for determination of percent infection, this
index grows from 4.26% to 5.08%, even if the difference
between age groups does not reach statistical significance by
the chi^2 test.
In Brazil, indexes similar to the above ones were found: 5.2%
in Belem (Para) by Loureiro et al. (1989) and 6.4% in Recife
(Pernambuco) by Silva et al. (1994). But Loureiro et al.
(1989) restricted their observations to children aged from one
to two years and Silva et al. (1994) observed only patients
from two to 12 months of age.
In the present study one of the infected children belonged
to the age group of eight to ten years, what brings the index
of infection of the group to 33.33%, a figure that must be
looked at with care, since it may be the consequence of
sampling deficiency and also having in mind that the
percentual of children with a diarrhea clinic picture tends
to decrease with age increase.
The employ of a cyst concentration technique must be
emphasized, since such elements were scarce, one per three
observed microscope fields. So it is supposed that without the
use of such an aid, the level of infection could have been
under-estimated. In what the sating techniques are concerned,
the infection rate they disclosed was the same, meaning that
they detected the oocysts of Cryptosporidium in every
single one of the three slides from the three samples from
infected patients.
The Safranin/Methylene Blue staining method is regarded as
easier in handling besides being quicker and time saving,
Rahman et al. (1990), Assadamongkol et al. (1992) and Bolbol
(1992) have mentioned after concentration of cysts from faecal
material, with out mentioning, though, any reason for such an
option. Even observing the similarities of symptoms on the
diarrhea syndrome, there has been diversity in the frequency
of such symptoms between each individual of the 94 children.
It can be observed that 27.66% of them manifested an under-
nourishment picture, but only one of the
Cryptosporidium infection coincided with such picture
(Table). The chi^2 test did not show any significant
difference between the undernourished and the rest of the
children. Mangini et al. (1992), were also unable to detect
such a difference based on the nutritional status, agreeing
to Bogaerts et al. (1984), in Central Africa.
Looking at Table it can be seen that two patients had another
parasitic infection concomitant with cryptosporidiosis.
Informations from the reference-card of each of the four
Cryptosporidium infected children show that none of
them presented positive coproculture for intestinal bacterium
processed from contemporary faecal samples; circumstantial
evidence points out that in two of the diarrheic children
Cryptosporidium was the only identified etiologic
agent.
Notwithstanding the fact that this study covered only a year
of observations, thus making it difficult to conclude
adequately on season-depending characters of cryptosporidiosis
in children, this infection was observed in November and
December 1992 (three cases, 3.19%) at the full rainy season,
and in March 1993 (one case, 1.09%), at the end of the rainy
season. At the Northeast Region of Brazil, Weikel et al.
(1985) conducted a study during two years and five months. All
cryptosporidiosis cases were found from October to March, that
is to say, from the end of the dry season through the wet
season, up to its end.
Within the present study are included two
Cryptosporidium infected children cared for at a
private paediatric practice pertaining to a high standard of
socio-economic status. That is an interesting finding since
this kind of infection may be to prevail among the lowest
layers of poor and uncared for communities three of the
infected patients used at home pipeline water from a modern
urban network, what doesn't preclude tap-water as a source of
infection. Hayes et al. (1989), at the U.K., and Smith et al.
(1989), in USA, reported cryptosporidiosis outbreaks
transmitted through treated water; the presence of such
organism's oocysts in water reservoir previous to treatment
was shown by Ongerth and Stibbs (1987) and by Lechevallier et
al. (1991). The use of water from an artesian well by one of
the infected high-class patients, whose house was not
connected to the urban sewage drain system, configures another
pattern of exposition to oocysts and contamination risk.
Only one of the infected patients did not keep an animal at
home. The presence of cryptospori-diosis in pet mammals is a
known fact and their contact with man have been focused in
cryptosporidiosis transmission (Lengerich et al. 1993).
Acknowledgements
To Prof. Uriel Franco Rocha for his suggestions.
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This study was supported by project 18/91-92 from PROPEP -
Universidade Federal de Uberlandia, MG and CAPES 1992-1994 -
Brazil.
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TABLE Presentation of four cryptosporidiosis cases
(4.26%) from 94 diarrheic children in Uberlandia, MG, Brazil
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Case Medical Month/ Sex Age Symptoms Concomitant
no. centres year parasites
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53 S 11/92 M 3m Fever, vomition, Negative
abdominal pain,
undernourishment
dehydration
63 PP 12/92 F 9y 6m Eutrophic, Negative
abdominal pain
64 PP 12/92 M 1y 10m Eutrophic, Giardia
vomition, intestinalis
abdominal pain
75 S 03/93 M 1y 5m Eutrophic,fever Strongyloides
vomition, stercoralis
abdominal pain
M = male; F = female; m = month; y = year; S =
sickroom; PP = private practice.
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Copyright 1996 Fundacao Oswaldo Cruz
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