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Wet-days: are they better indicators of Ascaris infection levels?

Published online by Cambridge University Press:  12 April 2024

G.S.A. Gunawardena ,
N.D. Karunaweera  and
M.M. Ismail
G.S.A. Gunawardena*
Affiliation:
Department of Parasitology, Faculty of Medicine, University of Colombo, PO Box 271, Kynsey Road, Colombo 8, Sri Lanka
N.D. Karunaweera
Affiliation:
Department of Parasitology, Faculty of Medicine, University of Colombo, PO Box 271, Kynsey Road, Colombo 8, Sri Lanka
M.M. Ismail
Affiliation:
Department of Parasitology, Faculty of Medicine, University of Colombo, PO Box 271, Kynsey Road, Colombo 8, Sri Lanka
*
*Fax: +94 11 2699284E-mail: sharminigunawardena@hotmail.com
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Abstract

Seasonal variation in a particular area may influence the occurrence of helminth infections and determining such fluctuations may help to maximize the beneficial effects of mass treatment. This study determined the seasonal variations in infection levels of Ascaris lumbricoides between March 2000 and June 2001 in two selected low-country plantations. Four hundred and seventy seven persons aged between 2 and 74 years (median 13) participated. Stools were tested using the Kato-Katz method and the prevalence and intensity of infection determined. All persons were treated with a single dose of mebendazole. Monthly follow-ups were undertaken with similar stool examinations and treatment given if found positive. Infection and re-infection rates were calculated each month. Rainfall and temperature were recorded each day. Total rainfall, number of wet-days and mean temperature was calculated for each month. The prevalence of Ascaris infection was 53.4% and 51.0% at Maliboda and Ayr estates respectively. Highest infection and re-infection rates at Maliboda (37.7%, 37.2%) occurred in June and at Ayr (13.3%, 25.9%) in October 2000 respectively. During the study period, the mean rainfall was 28.1 cm (range 7.4–63.9 cm) and mean temperature 27.6°C (range 22.1°–34.4°C). Significant correlations (P<0.05) were found between the re-infection rate and rainfall, temperature and the number of wet-days. Similar correlations were observed with the infection rate and temperature and the number of wet-days. Ascaris infections were found to correlate significantly only with the number of wet-days in a month (P<0.01). Thus, the number of wet-days appears to be a better indicator of Ascaris infections than total rainfall or mean temperature.

Type
Review Article
Information
Journal of Helminthology , Volume 78 , Issue 4 , December 2004 , pp. 305 - 310
Copyright
Copyright © Cambridge University Press 2004

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References

Beaver, P.C. (1975) Biology of soil-transmitted helminths: the massive infection. Health Laboratory Science 12, 116–125.Google ScholarPubMed
Brown, H.W. (1927) Studies on the rate of development and viability of the eggs of Ascaris lumbricoides and Trichuris trichiura under field conditions. Journal of Parasitology 14, 1–15.CrossRefGoogle Scholar
Cabrera, B.D. (1984) Re-infection and infection rates of ascariasis in relation to seasonal variation in the Philippines. Southeast Asian Journal of Tropical Medicine and Public Health 394–401.Google ScholarPubMed
Carrera, E., Nesheim, S.C. & Crompton, D.W.T. (1984) Lactose maldigestion in Ascaris infected pre-school children. American Journal of Clinical Nutrition 39, 255–264.Google Scholar
Chan, M.S. (1997) The global burden of intestinal nematode infections–fifty years on. Parasitology Today 13, 438–448.CrossRefGoogle Scholar
Chandrapala, L. (1995) Calculation of average monthly rainfall of Sri Lanka, Department of Meteorology (unpublished).Google Scholar
Crompton, D.W.T. (1986) Nutritional aspects of infection. Transactions of the Royal Society of Tropical Medicine and Hygiene 80, 697–705.CrossRefGoogle ScholarPubMed
Crompton, D.W.T. (1999) How much human helminthiasis is there in the world? Journal of Parasitology 85, 397–403.CrossRefGoogle ScholarPubMed
Crompton, D.W.T. & Pawlowski, Z.S. (1985) Life history and development of Ascaris lumbricoides and the persistence of human ascariasis. pp. 9–23 in Crompton, D.W.T et al. (Eds) Ascaris and its public health significance. London, Taylor and Francis.Google Scholar
De Silva, N.R., Guyatt, H.L. & Bundy, D.A.P. (1997a) Morbidity and mortality due to Ascaris induced intestinal obstruction. Transactions of the Royal Society of Tropical Medicine and Hygiene 91, 31–36.CrossRefGoogle ScholarPubMed
De Silva, N.R., Guyatt, H.L. & Bundy, D.A.P. (1997b) Anthelmintics. Drugs 53, 769–788.CrossRefGoogle ScholarPubMed
Edirisinghe, J.S. & Weilgama, D.J. (1997) Soil contamination with geohelminth ova in a tea plantation. Ceylon Medical Journal 42, 167–172.Google Scholar
Fernando, T.K. & Chandrapala, L. (1995) Climate variability of Sri Lanka. Paper presented at the International Symposium on Climate in Asia-Pacific. Darussalam, University of Brunei.Google Scholar
Gurubacharya, V.L. (1986) Seasonal variation in the incidence of soil-transmitted helminthic infection in Kathmandu. pp. 42–45 in Yokogawa, M. et al. (Eds) Collected Papers on the Control of Soil-transmitted Helminthiases. Vol. III. APCO, Tokyo.Google Scholar
Kan, S.P. (1985) Ascaris lumbricoides infections in Malaysia. pp. 69–82 in Crompton, D.W.T. et al. (Eds) Ascariasis and its public health significance. London, Taylor and Francis.Google Scholar
Katz, M., Chares, A. & Pellegrino, J. (1972) A simple device for quantitative stool thick smear technique in Schistosoma mansoni . Revista do Instituto de Medicina Tropical de Sao Paulo 14, 397–400.Google Scholar
Kobayashi, A. (1983) The method for the investigation of seasonal variation in the incidence of soil transmitted helminthic infection. pp. 107–110 in Yokogawa, M. et al. (Eds) Collected Papers on the Control of Soil-transmitted Helminthiases. Vol. II. APCO, Tokyo.Google Scholar
Nokes, C., Grantham-Mcgregor, S.M., Sawyer, A.W., Cooper, E.S., Robinson, B.A. & Bundy, D.A.P. (1992) Moderate to heavy infections of Trichuris trichiura affect cognitive function in Jamaican school children. Parasitology 104, 539–547.CrossRefGoogle ScholarPubMed
Otto, G.F. (1929) A study of the moisture requirements of the eggs of the horse, the dog, human and pig ascarids. American Journal of Hygiene 10, 497–520.Google Scholar
Pan, C., Ritchie, L.S. & Hunter, G.W. (1953) Reinfection and seasonal fluctuations of Ascaris lumbricoides among a group of children in an area where night soil is used. Journal of Parasitology 40, 603–608.CrossRefGoogle Scholar
Rahman, A.H.M.A. (1986) Study of seasonal variation and degree of infection and it's impact on nutritional status of semi-urban population of Dattapara, Dhaka, pp. 8–14 in Yokogawa, M. et al. (Eds) Collected Papers on the Control of Soil-transmitted Helminthiases. Vol. III. APCO, Tokyo.Google Scholar
Sivakumar, B. & Reddy, V. (1975) Absorption of vitamin A in children with ascariasis. Journal of Tropical Medicine and Hygiene 78, 114–115.Google ScholarPubMed
Sorensen, E., Ismail, M., Amarasinghe, D.K.C., Hettiarachchi, I. & Dassenaieke, T.S.D.C. (1994) The effect of the availability of latrines on soil transmitted nematode infections in the plantation sector in Sri Lanka. American Journal of Tropical Medicine and Hygiene 51, 36–39.CrossRefGoogle ScholarPubMed
Sorensen, E., Ismail, M., Amarasinghe, D.K.C., Hettiarachchi, I. & Dassenaieke, T.S. (1996) Prevalence and control of soil-transmitted nematode infections among children and women in the plantations in Sri Lanka. Ceylon Medical Journal 41, 37–41.Google ScholarPubMed
Stephenson, L.S., Latham, M.C., Kurz, K.M., Kinoti, S.N. & Brigham, H. (1989) Treatment with a single dose of albendazole improves growth of Kenyan school children with hookworm, Trichuris trichiura and Ascaris lumbricoides infections. American Journal of Tropical Medicine and Hygiene 41, 78–87.CrossRefGoogle Scholar
Stephenson, L.S., Latham, M.C., Kinoti, S.N., Kurz, K.M. & Brigham, H. (1990) Improvements in physical fitness of Kenyan schoolboys infected with hookworm, Trichuris trichiura and Ascaris lumbricoides following a single dose of albendazole. Transactions of the Royal Society of Tropical Medicine and Hygiene 84, 277–282.CrossRefGoogle ScholarPubMed
Stephenson, L.S., Latham, M.C. & Ottesen, E.A. (2000) Malnutrition and parasitic helminth infections. Parasitology 121, S23–S38.CrossRefGoogle ScholarPubMed
Storey, G.W. & Phillips, R.A. (1985) The sorting of parasite eggs throughout the soil profile. Parasitology 91, 585–590.CrossRefGoogle Scholar
Suzuki, R. & Sanbe, T. (1977) Evaluation of Katz's quantitative method and its improvement. Japanese Journal of Parasitology 26 (suppl), 35–37.Google Scholar
Takasaki, H. (1935) Studies on the infection sources of human parasites. Journal of Experimental Medicine 19, 643–692 (in Japanese).Google Scholar
Tripathy, K., Duque, E., Bolanos, O., Lotero, H. & Mayoral, L.G. (1972) Malabsorption syndrome in ascariasis. Journal of Clinical Nutrition 25, 1276–1287.Google ScholarPubMed
World Health Organization (1964) Soil-transmitted helminths: Report of a WHO Expert Committee on Helminthiases. Geneva, World Health Organization. WHO Technical Report Series, 277.Google Scholar
WHO (1981) Intestinal protozoan and helminthic infections: Report of a WHO Scientific Group. Geneva, World Health Organization. WHO Technical Report Series, 666.Google Scholar
WHO (1987) Prevention and control of intestinal parasitic infections: Report of a WHO Expert Committee. Geneva, World Health Organization. WHO Technical Report Series, 749.Google Scholar
WHO (1991) Basic laboratory methods in medical parasitology. Geneva, World Health Organization.Google Scholar
WHO (2002) Prevention and control of schistosomiasis and soil-transmitted helminthiasis: Report of a WHO Expert Committee. Geneva, World Health Organization. WHO Technical Report Series, 912.Google Scholar