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Asymptomatic and symptomatic cryptosporidiosis: their acute effect on weight gain in Peruvian children
W Checkley1, R H Gilman, L D Epstein
1Department of International Health, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, MD 21205, USA.
Insights
First-time Cryptosporidium parvum infection in children, even without diarrhea (asymptomatic), significantly reduces weight gain. Asymptomatic infections, though less severe, are more common and may pose a greater overall risk to child growth.
Area of Science:
- Pediatric infectious diseases
- Child growth and development
- Parasitology
Background:
- Cryptosporidium parvum is a common enteric pathogen affecting young children globally.
- Understanding the impact of initial infection on child growth is crucial for public health interventions.
- Previous studies have focused on symptomatic infections, with less attention to asymptomatic cases.
Purpose of the Study:
- To investigate the acute effect of a child's first Cryptosporidium parvum infection on weight gain.
- To compare weight gain rates between C. parvum-infected and non-infected children.
- To differentiate the impact of symptomatic versus asymptomatic C. parvum infections on infant growth.
Main Methods:
- A prospective cohort study of 207 Peruvian children aged 0-3 months at recruitment.
- Bi-weekly assessment of diarrheal status and weekly stool examinations for C. parvum.
- Monthly anthropometric measurements to track weight gain over a 2-year period (1989-1991).
Main Results:
- 45% of children experienced their first C. parvum infection during the study.
- Symptomatic cryptosporidiosis led to an average weight gain reduction of 342g in the first month post-infection.
- Asymptomatic cryptosporidiosis resulted in an average weight gain reduction of 162g in the first month, but was twice as common.
Conclusions:
- Both symptomatic and asymptomatic Cryptosporidium parvum infections adversely affect infant weight gain.
- Asymptomatic infections, due to their higher prevalence, may have a more significant cumulative impact on child growth in the community.
- Early detection and management of C. parvum, even in asymptomatic cases, could be vital for optimal child development.
Abstract:
This study investigated whether a child's first infection with Cryptosporidium parvum had an acute effect on weight gain. Specifically, the authors compared monthly rates of weight gain between C. parvum-infected and noninfected children. Over a 2-year period (1989-1991), a cohort of Peruvian children aged 0-3 months at recruitment were followed twice weekly for assessment of daily diarrheal status, weekly for C. parvum stool examinations, and monthly for anthropometric measurements. Data on 207 children permitted the authors to examine the effect of C. parvum infection on weight gain. During the 2-year study period, 45% (94/207) of the children became infected with C. parvum for the first time. Weight gain intervals in 57 of the 94 infected children met criteria for analysis. Of these, 63 percent (36/57) were asymptomatic (i.e., had no diarrhea). On average, children with symptomatic cryptosporidiosis gained (i.e., grew) 342 g less (95% confidence interval 167-517) during the first month of infection than did children without diarrhea who were not yet infected. The effect of asymptomatic cryptosporidiosis was less severe: On average, children with asymptomatic infection gained 162 g less (95% confidence interval 27-297) during the first month of infection than did children without diarrhea who were not yet infected. Symptomatic cryptosporidiosis retarded weight gain more than did asymptomatic cryptosporidiosis, but the latter was twice as common. Since asymptomatic cryptosporidiosis is more prevalent, it may have more of an overall adverse effect on child growth in the community than symptomatic cryptosporidiosis.