Croup may also be caused by influenza A and B, adenovirus, measles, and respiratory syncytial virus (RSV).
Each consists of a prolongation of the syncytial material of the proboscis skin, penetrated by canals and sheathed with a scanty muscular coat.
In effect (6) it traces the Turbellaria to small two-layered organisms consisting of an outer ciliated epidermis and a central syncytial tissue.
Many pulmonary infections in early childhood, including those due to Chlamydia pneumoniae, Mycoplasma pneumoniae, and respiratory syncytial virus, have been linked with an increased risk for wheezing and asthma.
Most cases of bronchiolitis are caused by viruses, the most common of which is respiratory syncytial virus.
People do not gain permanent immunity to respiratory syncytial virus and can be infected many times.
Respiratory syncytial virus (RSV) is a virus that can cause severe lower respiratory infections in children younger than two years of age and milder upper respiratory infections in older children and adults.
Respiratory syncytial virus infection is so common that prevention is impossible.
Respiratory syncytial virus is spread through close contact with an infected person.
Ribavirin (Rebetol, Virazol), used for treatment of hospitalized infants and young children with severe lower respiratory tract infections caused by respiratory syncytial virus (RSV), but its value is controversial.
The careful study of the development of one Acoelous form and of certain Rhabdocoels has strengthened this hypothesis by showing that no definite enteron or gut is at first laid down, but that certain embryonic syncytial tracts become digestive tracts, others excretory, others again muscular.
Until, however, further evidence is forthcoming in support of this syncytial theory of structure, it would be unwise to regard it as established sufficiently to constitute a serviceable working hypothesis; hence, for the time being, we must accept the assertion that the cell represents the ultimate tissue-unit.
Viruses cause the majority of pneumonias in young children, especially respiratory syncytial virus, parainfluenza and influenza viruses, and adenovirus.