66-69

Comunicación Breve

Parasitología

Kasmera 47(1):66-69, Enero-Junio, 2019. ISSN 00755222   E-ISSN 2477-9628

Seroprevalence of antibodies IgG/IgM anti-T. gondii in women of Coro, Venezuela

Seroprevalencia de anticuerpos IgG / IgM anti-T. gondii en mujeres de Coro, Venezuela

Saúl-García Yotsabeth. Bioanalyses School. Central University of Venezuela. Caracas. Venezuela. E-mail: yotsabeth@gmail.com

Martínez-Leal Coromoto. Instituto Venezolano de los Seguros Sociales “Dr. Rafael Gallardo”. Clinical analysis Lab. Veterinary Faculty. Francisco de Miranda National University. Coro. Venezuela. E-mail: corocoramar@yahoo.com

Semprún-Hernández Neomar. Immunology Lab. Experimental Sciences Faculty. Zulia University. Maracaibo. Venezuela. E-mail: neomar.semprun@gmail.com

Martínez-Méndez Dilia (Corresponding Author). Talatona Clinic. International SOS. Luanda. Angola. Rua S10. Sector de Talatona. Zona CC-B2. Luanda. Angola. Telephone: +34622339081 & +244 936174795. E-mail: dkmartinez.mw@gmail.com

Resumen

Studies show a high frequency of IgG against T. gondii. The aim was to evaluate the seroprevalence of IgG and IgM anti-T. gondii in 522 women. 13% of seropositivity IgG+/IgM- and 0.7% IgG+/IgM+ was found. This could be due to the climate characteristics who may decrease the transmission. We recommend the evaluation if the environmental may affect the viability of the oocysts.

Palabras clave: toxoplasmosis; seroprevalence; IgG & IgM; Toxoplasma gondii; Venezuela

Abstract

Los estudios muestran una alta frecuencia de IgG contra T. gondii. El objetivo fue evaluar la seroprevalencia de IgG y IgM anti-T. gondii en 522 mujeres. Se encontró 13% de la seropositividad IgG +/IgM- y 0,7% IgG+/IgM+. Esta frecuencia podría deberse a las características del clima. Recomendamos estudiar si el medio ambiente puede afectar la viabilidad de los ooquistes.

Keywords: toxoplasmosis; seroprevalencia; IgG e IgM; Toxoplasma gondii; Venezuela

Recibido 04-01-2019  /  Aceptado 06-03-2019  /  Publicación en línea 19-03-2019

Introducción

Toxoplasmosis is a worldwide parasitic zoonosis produced by Toxoplasma gondii. In immunocompetent individuals, the primary infection is usually asymptomatic, but persists in a latent state throughout life, and can be reactivated in case of immunosuppression (1). The Feline is the definitive host eliminating oocysts in the feces. The mechanisms of human infection are the ingestion of oocysts, blood transfusion, organ transplants and by placental transmission (1-4). Worldwide, the prevalence of toxoplasmosis is high. In America, around 65% of the population has detectable levels of total anti-Toxoplasma gondii specific immunoglobulins, where contact with feces of cats has been shown to be the main risk factor (2).

In Venezuela, studies conducted in pregnant women, children and adults at risk (homeless), blood donors and native populations, show a high frequency of specific IgG against T. gondii (5-14). However, because it is not a mandatory reporting disease, there is a sub-registration (15). The aim of this study was to evaluate the seroprevalence of IgG and IgM anti-T.gondii in women of the Coro in 2008 and 2012.

Métodos

Design and sample: A comparative study was conducted with 2008 and 2012 data. 522 women from Coro city, randomly selected, participated in the study and a serum sample were collected.

Ethical considerations: All women voluntarily accepted their participation through the signed informed consent. Anonymity and the World Bioethics Congress guidelines as well as Helsinki declaration were preserved.

Technical information: IgG and IgM anti-Toxoplasma gondii detection in 2008 (n=268) was made by the Microparticle Enzyme Immunoassay (MEIA), using the commercial kit (Toxo IgG and Toxo IgM, AxSYM®assay Abbott), and in 2012 (n=254) with the Fluorescent Enzyme-Linked Assay (ELFA), following the protocol of the manufacturer (VIDAS TOXO IgG and IgM system of bioMerieux®Inc). The reference values of the commercial kit were considered as a diagnostic. The MEIA kit reference values for IgG: positive >2.5 IU/ml and lower negative. For IgM: positive >0.600 IU/ml, negative <0.499 IU/ml and indeterminate 0.500-0.599 IU/ml. The ELFA kit reference values for IgG: positive >8 IU/ml and negative less than 4 IU/ml and indeterminate between 4-8 IU/ml. For IgM: positive >0.65 IU/ml, negative <0.55 IU/ml and indeterminate 0.55-0.65 IU/ml. Any indeterminate sample was repeated to confirm the results.

Analysis of the data: Data obtained was entered on to an excel spreadsheet and transferred to SPSS version 21 statistical program for the analysis.

Result

Of the 522 women evaluated, seronegative anti-Toxoplasma gondii specificity IgG-/IgM- were 86% (n=451). 13% (n=65) presented IgG+/IgM-. 1% was IgG-/IgM+ (n=2) and 1% was IgG+/IgM+ (n=4). The seroprevalence by year and specificity are shown in Table 1. Women who presented seropositivity to IgM received pharmacological treatment. The distribution according to the specificity of IgG/IgM antibody is shown in Figure 1.

Table 1. Seroprevalence of anti-Toxoplasma gondii specificity by year. Coro, Venezuela.

Specificity

2008

2012

Total

n

%

n

%

N

%

IgG+/IgM+

0

0

4

2

4

0.7

IgG+/IgM-

38

14

27

10

65

13

IgG-/IgM+

1

0,3

1

0,3

2

0.3

IgG-/IgM-

229

85,7

222

87,7

451

86

Total

268

100

254

100

522

100

 


Figure 1. anti-Toxoplasma gondii IgG-IgM specificity distribution. 2008-2012. Coro. Venezuela

Discusión

Toxoplasmosis is the most widespread parasitic zoonosis in nature. It has been shown in all latitudes, in humans, more than 300 species of mammals and around 30 species of birds. It is usually asymptomatic, but it is responsible for many abortions, fetal, perinatal and infant hazard and is the most frequent cause of focal infection of the central nervous system in patients with AIDS, representing a latent threat for all immunosuppressed patients (2-4).

We found 13% of seropositivity of anti-T gondii IgG+/IgM-, keeping low thru the years. No statistically significant variation (p>0.05) during the follow-up. Positivity both for IgG/IgM was observed only in 0.7% of the 2012 samples, probably a reactivation of a past infection and was 0% on the 2008 samples (Table 1). Our data is in contradiction of the studies in Venezuela WHO show a high prevalence of specific IgG/IgM antibodies in urban areas between 32 (5,6) and 61%, in pregnant women and in individuals at risk (homeless) between 42 and 67% (7-9). In rural areas it has been reported from 39 to 49% (10). In native populations: 50% of the Barí of the Sierra de Perijá of Zulia state, 88% of the Güajiba from the Venezuelan Amazon rainforest and 69% from the Piaroa of the Bolívar state (11-14). High prevalence rates are also observed in the rest of the America: Brazil 66%, Colombia 47%, Mexico 56%, Trinidad and Tobago 39% (16-19). In Europe, 38% in Croatia (20). In Asia, 42% to 55% in India, Malaysia and Nepal (21,22).

The IgM seroprevalence remained less than 1% during the years, which shows a very low prevalence of acute infection in this population (23,24). This low prevalence is also observed in a small group with no pregnant women in Oman (25). It also proves that both diagnostic techniques (ELFA and MEIA) provide good reproducibility of the results and comparable sensitivity and specificity at the quantitative level of IgG/IgM specific anti-T. gondii (Fig 1). The specific IgG/IgM reactivity it is easier to evaluate the stage of the infection since high IgG levels can persist beyond the year and even low levels can remain in past infections. However, a low titer may also be the first stage in the ascending curve of IgG in a recent infection (26,27).

The lower frequency of infection by T. gondii found in this study comparative with others carried out in the country could be due to the climate characteristics of the Coro city, with high temperatures (24-34ºC), clay soils of acidic pH (4,5-5,5) and strong trade alisios winds (28), which probably affect the viability of the oocysts, decreasing the possibility of transmission.

We recommend keeping the follow-up of the seroprevalence of infection by T. gondii in Venezuela, with the evaluation of the risk factors in the infected people and to study if the environmental characteristics may have consequences of the on the viability of the oocysts.

Acknowledge

To the staff of the laboratories “Virgen María Auxiliadora” and IVSS "Dr. Rafael Gallardo” for all the support and Dr. Rosaura Hernández for the critical review of the manuscript.

Conflict of Interests

The authors declare that they have no financial or personal relationship(s) that may have inappropriately influenced them in writing this article.

Funding

This study received no funding.

Disclaimer

The views expressed in the submitted article are all author´s own and not an official position of the institution or funder.

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Copyright (c) 2019 Totsabeth Saúl-Garcia, Coromoto Martínez-Leal, Neomar Semprún-Hernández, Dilia Martínez-Mendez

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