Ascariasis and childhood malnutrition

Area of Science:

• Epidemiology
• Pediatric Nutrition
• Infectious Diseases

Background:

• Ascariasis, caused by the nematode Ascaris lumbricoides, is a prevalent helminthic infection globally.
• Childhood malnutrition, particularly impaired growth, is a significant public health concern in developing countries.
• The relationship between ascariasis and childhood malnutrition requires robust scientific evidence from field studies.

Purpose of the Study:

• To review epidemiological evidence on the impact of ascariasis on childhood malnutrition and growth.
• To provide concrete scientific evidence from field studies published since 1975.
• To assess the effectiveness of anthelmintic treatment in improving nutritional status and growth.

Main Methods:

• Systematic review of epidemiological field studies (cross-sectional and intervention) published since 1975.
• Studies conducted in developing countries across Africa, Asia, and Latin America.
• Analysis of data from studies employing anthelmintics with varying dosing frequencies and follow-up periods (33 days to 2 years).

Main Results:

• Improved nutritional status (growth, vitamin levels, albumin) observed in Ascaris-free or treated children compared to infected/untreated children.
• Significant improvement in weight and height following chemotherapeutic treatment in randomized controlled studies.
• Treatment benefits were most pronounced in studies with high ascariasis/malnutrition prevalence, regular treatment, and specific anthelmintics (tetramisole, levamisole, pyrantel).

Conclusions:

• Ascariasis infection (Ascaris lumbricoides) demonstrably retards childhood growth.
• Anthelmintic treatment is effective in improving nutritional status and growth, particularly with regular and sustained interventions.
• Further research should address reasons for growth improvement failures in some studies.