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Asymptomatic Shigella infections in a cohort of Mexican children younger than two years of age. 1994

L Guerrero, and J J Calva, and A L Morrow, and F R Velazquez, and F Tuz-Dzib, and Y Lopez-Vidal, and H Ortega, and H Arroyo, and T G Cleary, and L K Pickering
Department of Infectious Diseases, Instituto Nacional de la Nutrición, Mexico City, Mexico.

The proportion of Shigella infections that occur asymptomatically in young children has not been established. A community-based cohort study of 367 infants was followed prospectively by weekly home visits from January, 1990, through December, 1991. Stool samples were collected weekly and when diarrhea occurred and were tested for Shigella and other enteropathogens. There were 2925 child months of observation and 65 episodes of Shigella infection. There were 3.1 episodes/100 child months during the warm season (May through September) and 0.97 episode/100 child months during the cold season. Shigella infections were rare during the first 6 months of life but increased with age (P < 0.0001). Overall 55% of detected infections were asymptomatic. The proportion of infections that were asymptomatic increased as age increased (P < 0.01). Symptom status was not significantly associated with Shigella species or season. All isolates from symptomatic and asymptomatic children had the 120- to 140-megadalton virulence plasmid. We conclude that infections with virulent strains of Shigella are commonly asymptomatic in Mexican children during the first 2 years of life.

UI MeSH Term Description Entries
D007223 Infant A child between 1 and 23 months of age. Infants
D007231 Infant, Newborn An infant during the first 28 days after birth. Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D008800 Mexico A country in NORTH AMERICA, bordering the Caribbean Sea and the Gulf of Mexico, between BELIZE and the UNITED STATES, and bordering the North Pacific Ocean, between Guatemala and the UNITED STATES.
D011446 Prospective Studies Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group. Prospective Study,Studies, Prospective,Study, Prospective
D001942 Breast Feeding The nursing of an infant at the breast. Breast Fed,Breastfed,Milk Sharing,Wet Nursing,Breast Feeding, Exclusive,Breastfeeding,Breastfeeding, Exclusive,Exclusive Breast Feeding,Exclusive Breastfeeding,Sharing, Milk
D004405 Dysentery, Bacillary DYSENTERY caused by gram-negative rod-shaped enteric bacteria (ENTEROBACTERIACEAE), most often by the genus SHIGELLA. Shigella dysentery, Shigellosis, is classified into subgroups according to syndrome severity and the infectious species. Group A: SHIGELLA DYSENTERIAE (severest); Group B: SHIGELLA FLEXNERI; Group C: SHIGELLA BOYDII; and Group D: SHIGELLA SONNEI (mildest). Shigellosis,Dysentery, Shiga bacillus,Dysentery, Shigella boydii,Dysentery, Shigella dysenteriae,Dysentery, Shigella dysenteriae type 1,Dysentery, Shigella flexneri,Dysentery, Shigella sonnei,Shigella Dysentery,Shigella Infection,Bacillary Dysentery,Dysenteries, Shigella,Dysenteries, Shigella boydii,Dysenteries, Shigella dysenteriae,Dysenteries, Shigella flexneri,Dysenteries, Shigella sonnei,Dysentery, Shigella,Infection, Shigella,Infections, Shigella,Shiga bacillus Dysentery,Shigella Dysenteries,Shigella Infections,Shigella boydii Dysenteries,Shigella boydii Dysentery,Shigella dysenteriae Dysenteries,Shigella dysenteriae Dysentery,Shigella flexneri Dysenteries,Shigella flexneri Dysentery,Shigella sonnei Dysenteries,Shigella sonnei Dysentery
D005243 Feces Excrement from the INTESTINES, containing unabsorbed solids, waste products, secretions, and BACTERIA of the DIGESTIVE SYSTEM.
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012621 Seasons Divisions of the year according to some regularly recurrent phenomena usually astronomical or climatic. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) Seasonal Variation,Season,Seasonal Variations,Variation, Seasonal,Variations, Seasonal
D012761 Shigella boydii One of the SHIGELLA species that produces bacillary dysentery (DYSENTERY, BACILLARY).

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