MEM INST OSWALDO CRUZ, RIO DE JANEIRO, 91(6) Nov/Dez 1996
PAGES: 751-754 DOI: Full paper
The Serological Differentiation of Acute and Chronic Schistosomiasis Japonica Using IgA Antibody to Egg Antigen

Cen Liping +, LG Viana*, TC Melo Garcia*, ALT Rabello*, N Katz*

Hubei Institute of Schistosomiasis Control, Wuhan, 430070 Hubei, People's Republic of China
*Centro de Pesquisas René Rachou-FIOCRUZ, Av. Augusto de Lima 1715, 30190-002 Belo Horizonte, MG, Brasil

Abstract

Two groups of Schistosoma japonicum infected patients (acute and chronic ) and non-infected individuals were studied using IgA antibody to egg antigen (SEA) and IgG and IgM antibodies to keyhole limpet haemocyanin (KLH). The means and standard deviation of the optical density in ELISA of acute, chronic and negative groups for IgA anti-SEA were 583±124.7, 98.2±78.8 and 82.2±39. 3, respectively. There was a statistically significance between acute patients and chronic patients (P0.01). The sensitivities of IgA to SEA and IgG and IgM antibodies to KLH for the detection of acute infection were 95.24%, 90.48% and 85.71%, respectively. Therefore, this study showed that the detection of IgA to SEA is also a useful new method for the serological differentiation of acute and chronic schistosomiasis japonica in humans.

Although the present frequency of acute infection in China is much less than it was in the 1950s and 1960s, thousands of acute infections are still reported in the marshlands and lake regions (Zhang 1985,1987, Mao 1986, Anonymous 1989). From 1980 to 1988 the total number of acute cases due to Schistosoma japonicum infection has been fluctuating between 2, 400 and 7,000 per year in China (Wang & Jia 1989).

The clinical findings of acute schistosomiasis mansoni may easily be confused with a number of infectious diseases such as malaria, typhoid fever, visceral leishmaniasis, miliary tuberculosis, viral hepatitis, mononucleosis, salmonella infection or influenza and bacterial infections (Beaver et al. 1984, Chapman et al. 1988). The infected patients present a serious syndrome including: fever, weakness, loss of weight, diarrhoea, abdominal pain, cough, myalgia, arthralgia, urticaria, edema and enlargement of the liver and spleen (Neves 1965, Lambertucci 1993), which are markedly similar to acute schistosomiasis japonica. Acute S. japonicum infection causes severe morbidity in China, whereas acute S. haematobium and S. mansoni infection, which are usually self-limiting, may be fatal if untreated (Nash et al. 1982, Chen & Mott 1988). Misdiagnosis appears to be common during this phase of the disease (Houpis et al. 1984, Chapman et al. 1988). Therefore, it is necessary to look for a fast and early method of schistosomiasis diagnosis in humans.

Experimental studies have demonstrated the existence of a shared carbohydrate epitope between keyhole limpet haemocyanin (KLH) and schistosomulum surface antigens of S. mansoni (Grzych et al. 1987, Mansour et al. 1989). The high levels of antibodies against KLH were observed only in acutely infected patients (Omer et al. 1989). Thus, KLH serves as a means of rapid and easy identification of individuals with acute schistosomiasis infections of S. haematobium (Mansour et al. 1989), S. mansoni (Alves et al. 1992, Rabello et al. 1993) and Sjaponicum (Yushen et al. 1994).

Recently, high-level IgA antibody to egg antigen (SEA) was observed in acutely infected patients of S. mansoni. The rate of detection was 100% (Rabello et al. 1995). In this paper we report high-level anti-SEA IgA antibody in individuals with acute S. japonicum infection in China.

 

MATERIALS AND METHODS

Patients Acute sera - 21 cases were obtained from the highly endemic area in Wuchang county, Hubei provence, People's Republic of China, one month after contact with water contaminated with cercariae of S. japonicum and presenting with fever, diarrhoea and liver enlargement clinical mani


festation. The patients were 9-43 years old, geometric mean number of S. japonica eggs was 63.5 per gram. Their faeces were examined by the Kato-Katz technique (Katz et al. 1972). Chronic sera: 21 cases were obtained from the highly endemic area in Jianling country, also identified by stool-examination. The geometric mean number of S. japonicum eggs was 54.8 per gram. Normal sera: 20 cases were obtained from healthy individuals that served as normal controls with negative stool examination.

Enzyme-linked immunosorbent assay - A standard micro-well enzyme-linked immunosor-bent assay (ELISA) using Nunc-Immuno plates (Maxisorp), IgA, IgM and IgG-Peroxidase conjugates (Sigma), and a Bio-Rad ELISA reader was employed. The methods of ELISA have been described in Rabello et al. (1993, 1995).

Optical densities greater than the mean value plus two standard deviations of the sera from chronically infected individuals were considered to indicate acute schistosomiasis (Mansour et al. 1989).

Statistical analysis - Students' T test was used to determine the significant differences in antibody response, using the ELISA optical density values, between the acute and chronic groups of patients. The EPIINFO V.6 program was used for statistical analysis.

 

RESULTS

The means and standard deviation of the optical density in ELISA of acute, chronic and negative groups for anti-SEA IgA were 583.2± 124.7, 98.2±78.8 and 82.2±39.3, respectively; for anti-KLH IgM and IgG were 413.6±148.5, 70.2±14.8 and 65.3±45.3 and 501.5±150.6, 113.0±79.1 and 28.8±56.3, respectively. There was a statistically significant difference between acute and chronic patients for anti-SEA IgA antibody (P<0.01) (Fig. 1), as well as for IgM and IgG to KLH (Fig. 2). The means of IgG and IgM to SEA between acute and chronic patients were not significantly different (P>0.05) (Fig. 3). The sensitivities of IgA antibody to SEA and IgG and IgM antibodies to KLH for the detection of acute infection were 95.24%, 90.48% and 85.71%, respectively, the specific ratios of IgA to SEA, IgG and IgM to KLH were 95%.

 

DISCUSSION

This study showed that IgA antibody-level to SEA was statistically higher in the acutely infected than the chronically S. japonicum infected group. The results obtained were identical with the findings of Rabello et al. (1995). The reaction was rapid and only one false positive was found in normal control group. Schistosomiasis is a focally distributed disease (Kloetzel 1989). The acute form of the disease is seldom recognized in infected patients from endemic areas (Katz & Bittencourt 1965), therefore a reliable and simple diagnostic method for the detection of acute schistosomiasis is required for patient-care in endemic and non-endemic countries, because some inhabitants of endemic countries do not live in an endemic area and people of non-endemic countries travel to endemic areas.

Previous data showed higher IgA responses to gut-associated antigens found in acute schistosomiasis compared to chronic schistosomiasis in studies using sections of liver granulomas (Kanamura et al. 1979), and paraffin sections of adult worms using indirect immunofluorescence (Kanamura et al. 1991).

Recently it has been demonstrated that IgA antibody to a 28- KD glutathione-s-transferase of S. mansoni seemed to play a protective role in patients with schistosomiasis, limiting egg laying and hatching (Grzych et al. 1993) and reducing the pathology related to the formation of egg granulomas (Boulanger et al. 1991).

Studies of the humoral response in acute and chronic schistosomiasis have shown that, as with cellular immune response, the antibody response to egg antigen is stronger in acutely infected patients, whereas the response to adult-worm antigens is stronger in patients with chronic infection (Gazzinelli et al. 1985, Simpson et al. 1990).

The results of this study suggest that the detection of high levels of IgA to SEA is a useful new tool for the serological differentiation of acute and chronic schistosomiasis japonica in humans. It is sufficiently sensitive, stable and rapid to make it suitable for use in the field.

 

ACKNOWLEDGMENTS

The study was conducted when Cen Liping was engaged in advanced studies for schistosomiasis control in Centro de Pesquisas René Rachou-FIOCRUZ, Brazil.

 

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+Corresponding author. Tel: +86-27-786.0567
Received 19 March 1996
Accepted 4 July 1996

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