Rotavirus A
Rotavirus A
Rotavirus A is a double-stranded RNA virus in the family Reoviridae and the most common cause of severe, dehydrating diarrhea in infants and young children globally. The virus is highly infectious and primarily transmitted via the fecal-oral route, targeting the enterocytes of the small intestine. Due to its triple-layered protein capsid, it exhibits high stability and persistence in various environmental conditions.
Details
Identification
Wheel-like appearance under electron microscopy, non-enveloped particle approximately 70-100 nm in diameter, genome consists of 11 segments of double-stranded RNA.
Diet
Obligate intracellular parasite; hijacks the host cell's (enterocyte) metabolism to replicate new viral particles.
Overwintering
High environmental stability; persists in water reservoirs or on moist surfaces for weeks at low temperatures.
Ecology
Ecological role
Pathogen in vertebrate populations; influences population dynamics through morbidity; component of the aquatic virome following fecal contamination.
Natural predators
Host immune system (antibodies, T-cells), bacterial proteases in the gut, UV radiation, and extreme pH values in the environment.
Competitor species
Other enteric pathogens such as noroviruses, astroviruses, or pathogenic bacteria (e.g., Escherichia coli, Salmonella).
Threats
Widespread vaccination programs, improved sanitation hygiene, and drinking water treatment.
Scientific profile
Profile
Habitat
Primarily the gastrointestinal tract of hosts. In the environment, it is found in sewage, surface waters, sediments, and on contaminated surfaces, where it exhibits high tenacity.
Ecological role
Acts as a regulator of host populations through disease pressure. In aquatic ecosystems, it serves as a biological indicator of anthropogenic fecal contamination.