Ultrasound is very useful for looking at soft tissue parts of the body such as the kidneys and bladder. Soft tissues do not show up well on x-ray. Your baby or child may have a renal ultrasound to: 1  find out if there are any blockages in the urinary tract (kidney, ureter, bladder and urethra).
Astrovirus is a type of virus that was first discovered in 1975 using electron microscopes following an outbreak of diarrhoea in humans.stroviruses are associated with 5â9% of cases of gastroenteritis in young children. The occurrence of astrovirus infection varies depending on the season. In temperate climates infection is highest during winter months. This is in contrast to tropical regions where prevalence is highest during the rainy season.
An RNA virus is a virus that has RNA (ribonucleic acid) as its genetic material. This nucleic acid is usually single-stranded RNA (ssRNA) but may be double-stranded RNA (dsRNA).he ICTV classifies RNA viruses as those that belong to Group III, Group IV or Group V of the Baltimore classification system of classifying viruses and does not consider viruses with DNA intermediates in their life cycle as RNA viruses.