Ascaris lumbricoides: reinfection in children bearing an established worm burden
To clarify the existance of reinfection in children bearing an established Ascaris lumbricoides infection, the authors evaluated the weight and the length of worms collected from ten cases of ascaridiasis. The worm burden was greater than 27 worms in nine cases. In seven cases the weight and the len...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Sociedade Brasileira de Medicina Tropical (SBMT)
1991
|
Subjects: | |
Online Access: | https://doaj.org/article/3139d1d61aa64518b6a67e49cbd06423 |
id |
ftdoajarticles:oai:doaj.org/article:3139d1d61aa64518b6a67e49cbd06423 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:3139d1d61aa64518b6a67e49cbd06423 2023-05-15T15:17:48+02:00 Ascaris lumbricoides: reinfection in children bearing an established worm burden Fausto E. Lima Pereira Andrea P. Sampaio Carlos Musso Jane S. Castelo 1991-12-01T00:00:00Z https://doaj.org/article/3139d1d61aa64518b6a67e49cbd06423 EN eng Sociedade Brasileira de Medicina Tropical (SBMT) http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0037-86821991000400003 https://doaj.org/toc/0037-8682 https://doaj.org/toc/1678-9849 0037-8682 1678-9849 https://doaj.org/article/3139d1d61aa64518b6a67e49cbd06423 Revista da Sociedade Brasileira de Medicina Tropical, Vol 24, Iss 4, Pp 217-221 (1991) Ascaris lumbricoides Ascaríase Ascariasis Arctic medicine. Tropical medicine RC955-962 article 1991 ftdoajarticles 2022-12-31T02:55:18Z To clarify the existance of reinfection in children bearing an established Ascaris lumbricoides infection, the authors evaluated the weight and the length of worms collected from ten cases of ascaridiasis. The worm burden was greater than 27 worms in nine cases. In seven cases the weight and the length of worms showed little variation, with unimodal distribution of values, suggesting that all the worms in each case belong to the same population, originated from a single brood infection or from successive infections over small time intervals. In three cases there was great variation in worm size indicated by the different values for the means and medians and by the high values for the standard deviation and coefficient of variation. In these three cases there was a bimodal distribution of worm's size suggesting the coexistance of two distinct populations: one, less numerous, composed of mature worms and the other, more numerous, composed ofimmature worms, in two cases, and two distinct populations of immature worms in one case. The existance of worms in different stages of maturation indicates that the less mature population was acquired when the mature worms were established in the gut. These results indicate that the reinfection with Ascaris in children bearing an established infection is not rare and resistance induced by a preexisting infection is not the rule. Para tentar esclarecer a existência de reinfecção em crianças portadoras de ascaridíase já estabelecida, foram avaliados o peso e o comprimento dos vermes colhidos em 10 casosde ascaridíase, em nove dos quais a carga parasitária foi maior do que 27 vermes. Em sete casos o peso e o comprimento dos vermes apresentaram pouca variação, com distribuição unimodal dos valores, sugerindo assim pertencerem todos a uma mesma população originada de uma única infecção ou de infecções repetidas com intervalos muito curtos. Em três casos, o peso e o comprimento dos vermes mostraram grande variação, indicada pelos valores diferentes para as médias e as medianas e dos ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ascaris lumbricoides Ascaríase Ascariasis Arctic medicine. Tropical medicine RC955-962 |
spellingShingle |
Ascaris lumbricoides Ascaríase Ascariasis Arctic medicine. Tropical medicine RC955-962 Fausto E. Lima Pereira Andrea P. Sampaio Carlos Musso Jane S. Castelo Ascaris lumbricoides: reinfection in children bearing an established worm burden |
topic_facet |
Ascaris lumbricoides Ascaríase Ascariasis Arctic medicine. Tropical medicine RC955-962 |
description |
To clarify the existance of reinfection in children bearing an established Ascaris lumbricoides infection, the authors evaluated the weight and the length of worms collected from ten cases of ascaridiasis. The worm burden was greater than 27 worms in nine cases. In seven cases the weight and the length of worms showed little variation, with unimodal distribution of values, suggesting that all the worms in each case belong to the same population, originated from a single brood infection or from successive infections over small time intervals. In three cases there was great variation in worm size indicated by the different values for the means and medians and by the high values for the standard deviation and coefficient of variation. In these three cases there was a bimodal distribution of worm's size suggesting the coexistance of two distinct populations: one, less numerous, composed of mature worms and the other, more numerous, composed ofimmature worms, in two cases, and two distinct populations of immature worms in one case. The existance of worms in different stages of maturation indicates that the less mature population was acquired when the mature worms were established in the gut. These results indicate that the reinfection with Ascaris in children bearing an established infection is not rare and resistance induced by a preexisting infection is not the rule. Para tentar esclarecer a existência de reinfecção em crianças portadoras de ascaridíase já estabelecida, foram avaliados o peso e o comprimento dos vermes colhidos em 10 casosde ascaridíase, em nove dos quais a carga parasitária foi maior do que 27 vermes. Em sete casos o peso e o comprimento dos vermes apresentaram pouca variação, com distribuição unimodal dos valores, sugerindo assim pertencerem todos a uma mesma população originada de uma única infecção ou de infecções repetidas com intervalos muito curtos. Em três casos, o peso e o comprimento dos vermes mostraram grande variação, indicada pelos valores diferentes para as médias e as medianas e dos ... |
format |
Article in Journal/Newspaper |
author |
Fausto E. Lima Pereira Andrea P. Sampaio Carlos Musso Jane S. Castelo |
author_facet |
Fausto E. Lima Pereira Andrea P. Sampaio Carlos Musso Jane S. Castelo |
author_sort |
Fausto E. Lima Pereira |
title |
Ascaris lumbricoides: reinfection in children bearing an established worm burden |
title_short |
Ascaris lumbricoides: reinfection in children bearing an established worm burden |
title_full |
Ascaris lumbricoides: reinfection in children bearing an established worm burden |
title_fullStr |
Ascaris lumbricoides: reinfection in children bearing an established worm burden |
title_full_unstemmed |
Ascaris lumbricoides: reinfection in children bearing an established worm burden |
title_sort |
ascaris lumbricoides: reinfection in children bearing an established worm burden |
publisher |
Sociedade Brasileira de Medicina Tropical (SBMT) |
publishDate |
1991 |
url |
https://doaj.org/article/3139d1d61aa64518b6a67e49cbd06423 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Revista da Sociedade Brasileira de Medicina Tropical, Vol 24, Iss 4, Pp 217-221 (1991) |
op_relation |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0037-86821991000400003 https://doaj.org/toc/0037-8682 https://doaj.org/toc/1678-9849 0037-8682 1678-9849 https://doaj.org/article/3139d1d61aa64518b6a67e49cbd06423 |
_version_ |
1766348028708388864 |