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Shedding of oocysts in immunocompetent individuals infected with Cryptosporidium
Abstract:
In June 1985, we investigated an outbreak of cryptosporidiosis at a day-care center in Florida. Through day-care center-wide stool screening, 33% (28/84) of the children and 22% (4/18) of the staff members submitting stool specimens were found to have cryptosporidiosis. Children 12-35 months of age and their teachers were at highest risk. All but 1 of the Cryptosporidium-positive patients reported diarrhea, which lasted between 1-44 days. Serial stool specimens were obtained from 8 infected individuals (5 children and 3 adults). Duration of oocyst shedding ranged from 8 to more than 50 days and continued in 5 individuals after diarrhea ceased. No relationship was found between duration of oocyst shedding and the age of the patient or duration or severity of diarrhea. Results of the investigation indicate that infected individuals may continue to excrete oocysts and, therefore, may remain infectious for days or weeks after gastrointestinal symptoms disappear.
Insights
Cryptosporidiosis outbreaks can spread rapidly in day-care centers. Infected individuals may remain infectious for weeks after diarrhea resolves, highlighting the need for continued monitoring.
Area of Science:
- Infectious Diseases
- Public Health
- Pediatrics
Background:
- Cryptosporidiosis is a significant cause of diarrheal illness, particularly in young children.
- Day-care centers are recognized settings for the transmission of infectious agents.
Purpose of the Study:
- To investigate the epidemiology of a cryptosporidiosis outbreak in a Florida day-care center.
- To determine risk factors and identify the duration of oocyst shedding in infected individuals.
Main Methods:
- Conducted a day-care center-wide stool screening to identify Cryptosporidium infections.
- Collected serial stool specimens from infected individuals to assess oocyst shedding duration.
- Analyzed data to identify high-risk age groups and correlations between shedding, age, and diarrhea.
Main Results:
- 33% of children and 22% of staff were infected.
- Children aged 12-35 months and their teachers were at the highest risk.
- Oocyst shedding persisted for 8 to over 50 days, continuing after diarrhea ceased in 5 individuals.
Conclusions:
- Infected individuals can remain infectious for extended periods after symptom resolution.
- This prolonged infectiousness poses a risk for continued transmission in community settings.
- Effective control measures require awareness of extended oocyst shedding post-diarrhea.