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.
A retrovirus is any virus belonging to the viral family Retroviridae. All The genetic material in retroviruses is in the form of RNA molecules, while the genetic material of their hosts is in the form of DNA.When a retrovirus infects a host cell, it will introduce its RNA together with some enzymes into the cell.This RNA molecule from the retrovirus must produce a DNA copy from its RNA molecule before it can be considered part of the genetic material of the host cell.hen a retrovirus infects a host cell, it will introduce its RNA together with some enzymes into the cell. This RNA molecule from the retrovirus must produce a DNA copy from its RNA molecule before it can be considered part of the genetic material of the host cell.