Diarrhea remains one of the most common illnesses of children worldwide.(1) Rotaviruses are the single most important etiologic agents of severe diarrhea among young children, responsible for 114 million cases, 25 - 55% of all hospital admissions for diarrhea and more than 610,000 deaths worldwide every year.(2) Rotavirus is ubiquitous and by the age of three to five years, 95% of the children worldwide would have been infected.(3) It is estimated that 82% of these deaths occur in developing countries (the third most common cause of death, with about two million deaths per year) equivalent to approximately 1,205 child deaths each day, because of poorer access to treatment and a greater prevalence of malnutrition.(2) In India, 350,000 children, under five, die every year due to diarrheal diseases, out of which one-third is due to rotavirus gastroenteritis. The prevalence of rotavirus diarrhea in India has been found to vary between 5 and 71% in hospitalized children < 5 years of age, with acute gastroenteritis.(4) Apart from the primary burden of rotavirus disease on childrens' health (mortality and morbidity), rotavirus also has a significant economic impact, which can be both direct and indirect. Examples of direct costs include medical costs resulting from hospitalizations, out patient visits, personnel, facilities, diagnostics, and medication. Indirect costs include those incurred to society and households as a result of lost work time when parents are forced to stay home to take care of sick children – resulting in reduction of labor productivity and loss of wages. Intangible costs such as pain and suffering add to the burden. A review of available preventive measures against rotavirus infection in relevance to India was hence undertaken. Rotavirus The rotavirus genus belongs to Reoviridae family of viruses. Rotaviruses are highly contagious and the predominant mode of transmission is the fecal–oral route.(3) It remains stable and infective in human feces for up to one week and can survive for weeks in recreational or drinking water, hence nosocomial infections are also widespread. Person-to-person spread, via contaminated hands, is probably the most important means by which rotaviruses are disseminated in close communities, such as hospitals and homes. Transmission among non-toilet trained children in nurseries and day care centers is facilitated by direct close contact, as well as sharing contaminated food, drinks or toys.(5) Asymptomatic excretion of rotavirus occurs in half of the infected children before the onset of clinical symptoms, and persists in one-third of the children a week after the symptoms end. Rotavirus infection is preceded by an incubation period of 24 – 48 hours. Symptoms range from vomiting and mild watery diarrhea of short duration to severe gastroenteritis with life-threatening dehydration, secondary to gastrointestinal fluid loss, a problem associated with developing countries. Significant rotavirus shedding occurs during an episode of diarrhea, but many infected individuals shed the virus without experiencing diarrhea. Respiratory transmission has been speculated because of (i) the high rates of infection in the first three years of life regardless of sanitary conditions, and (ii) the failure to document fecal oral transmission in several outbreaks of rotavirus over large geographic areas in the winter.(3,6) Published epidemiological studies covering 18 Indian cities (1996 – 2001) showed that G1 was the single most common serotype, and the burden of severe disease and hospitalization is borne predominantly by G1, G2, G3, G4, and G9.(7)
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