SciELO - Scientific Electronic Library Online

 
vol.49 issue6Dermatitis after contact with Pheropsophus sp (Coleoptera, Carabidae, Brachininae) in the Pará State, Brazilian AmazonNatural history of liver fibrosis progression in patients confected with hepatitis c virus and human immunodeficiency virus type 1 author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Revista da Sociedade Brasileira de Medicina Tropical

Print version ISSN 0037-8682
On-line version ISSN 1678-9849

Rev. Soc. Bras. Med. Trop. vol.49 no.6 Uberaba Nov./Dec. 2016

http://dx.doi.org/10.1590/0037-8682-0110-2016 

Images in Infectious Diseases

Meloidogyne eggs in human stool in Northeastern Brazil

Fred Luciano Neves Santos1 

Alina Maria Gonzaga Carlos de Souza2 

Filipe Dantas-Torres3 

1Laboratório de Patologia e Biointervenção, Instituto Gonçalo Moniz, Fundação Oswaldo Cruz, Salvador, Bahia, Brazil.

2Laboratório Datalab, Grupo Promedica, Salvador, Bahia, Brazil.

3Laboratório de Imunoparasitologia, Departamento de Imunologia, Centro de Pesquisas Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, Pernambuco, Brazil.

Root-knot nematodes (Meloidogyne spp.) are among the most economically damaging genera of plant-parasitic nematodes worldwide1. Although they are not pathogenic to humans, their eggs may eventually be found in human stools2 and owing to their similarity with eggs of pathogenic nematodes must be correctly identified to avoid unnecessary treatments. Recently, researchers reported the presence of eggs similar to those of Trichostrongylus spp. (identified as Meloidogyne eggs) in three (0.5%) of 586 stool samples collected from East Kwaio, Solomon Islands2. From 2008 to 2014, 332,132 stool samples, referred to a private laboratory network (Datalab) in Salvador, Brazil, were examined using the Lutz method; 61 (0.02%) were positive for Meloidogyne eggs (Figure 1).

FIGURE 1 A Meloidogyne egg showing a thin, hyaline shell and refractive internal corpuscles located between the shell and the morula, resembling lipid droplets. 

Meloidogyne eggs may be identified based on their shape, size, and absence or presence of characteristic internal structures3. Meloidogyne eggs have thin hyaline shells without visible markings, elongate-ovoid with rounded ends. One of the sides can be concave or slightly flattened. They measure 82-120µm in length × 24-43µm in width and can be seen inside a juvenile cell mass in the first division phase or in a fully formed larva. They may present internal refractive corpuscles, located between the shell and the morula, which are important to distinguish them from eggs of Trichostrongylus spp. and hookworms. The presence of corpuscles, resembling air-sacs, on one of the poles, between the morula and the shell is very characteristic, although not always present. However, during its development, the concavity and the air-sacs may disappear, and the egg becomes plano-convex or even biconvex.

References:

1. Jones JT, Haegeman A, Danchin EGJ, Gaur HS, Helder J, Jones MG, et al. Top 10 plant-parasitic nematodes in molecular plant pathology. Mol Plant Pathol 2013; 14:946-961. [ Links ]

2. Bradbury RS, Speare R. Passage of Meloidogyne eggs in human stool: forgotten, but not gone. J Clin Microbiol 2015; 53:1458-1459. [ Links ]

3. Pardinti VC, Ferreira CJ, Moura DM, Mendonça AR. Ocorrência de ovos de Trichostrongylus sp. e Meloidogyne sp. em exames coproparasitológicos de rotina. Rev Méd Minas Gerais 1999; 9:100-102. [ Links ]

Received: March 23, 2016; Accepted: May 09, 2016

Corresponding author: Dr. Fred Luciano Neves Santos. e-mail: fred.santos@bahia.fiocruz.br; flucianons@gmail.com

The authors declare that there is no conflict of interest

Creative Commons License This is an open-access article distributed under the terms of the Creative Commons Attribution License