Does co-infection with Giardia lamblia modulate the clinical characteristics of enteric infections in young children?
BACKGROUND
Giardia lamblia (G. lamblia) is a prevalent enteric pathogen causing both asymptomatic carriage and diarrheal illness among children worldwide. In this study we examined the hypothesis that G. lamblia may modulate the effect of other enteric pathogens during concurrent infection.


METHODS
Bedouin (n = 238) infants were followed from birth to ages 18-23 months. Morbidity was ascertained by weekly home interviews and infant's stools were collected fortnightly. The risk for and severity of diarrheal disease were compared between episodes caused by enteric pathogens other than G. lamblia alone and G. lamblia-mixed episodes.


RESULTS
In 59 of 293(20.1%) diarrhea episodes two or more pathogens were detected. In two thirds of the mixed episodes G. lamblia was involved. Neither the incidence of diarrhea nor the mean diarrheal episode duration differed between follow up months in which G. lamblia was or was not detected, when age specific or age adjusted values were compared. There were no differences in severity of episodes for single or G. lamblia-mixed infections except for rotavirus. Episodes with rotavirus alone were more severe as compared to episodes where co-infection with G. lamblia was found.


CONCLUSIONS
The results of this study do not confirm the hypothesis that G. lamblia modulates the clinical effect of infection with other enteric agents. However, the findings of the change in severity of infection with rotavirus suggest that this question warrants further investigation.
Bilenko
Natalya
N
Epidemiology and Health Services Evaluation Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
Levy
Amalya
A
Dagan
Ron
R
Deckelbaum
Richard J
RJ
El-On
Yossef
Y
Fraser
Drora
D
D000046:Academic Medical Centers; D000367:Age Factors; D000818:Animals; D002167:Campylobacter / Q000302:isolation & purification / Q000472:pathogenicity; D015897:Comorbidity; D003458:Cryptosporidium / Q000302:isolation & purification / Q000472:pathogenicity; D003968:Diarrhea, Infantile / Q000453:epidemiology / Q000382:microbiology* / Q000469:parasitology*; D004797:Enzyme-Linked Immunosorbent Assay; D005243:Feces / Q000382:microbiology / Q000469:parasitology; D016829:Giardia lamblia / Q000302:isolation & purification / Q000472:pathogenicity*; D005873:Giardiasis / Q000150:complications / Q000453:epidemiology / Q000382:microbiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007557:Israel / Q000453:epidemiology; D015995:Prevalence; D012401:Rotavirus / Q000302:isolation & purification / Q000472:pathogenicity; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires