Passage: In adults, viruses account for approximately a third and in children for about 15% of pneumonia cases. Commonly-implicated agents include rhinoviruses, coronaviruses, influenza virus, respiratory syncytial virus (RSV), adenovirus, and parainfluenza. Herpes simplex virus rarely causes pneumonia, except in groups such as: newborns, persons with cancer, transplant recipients, and people with significant burns. People following organ transplantation or those otherwise-immunocompromised present high rates of cytomegalovirus pneumonia. Those with viral infections may be secondarily infected with the bacteria Streptococcus pneumoniae, Staphylococcus aureus, or Haemophilus influenzae, particularly when other health problems are present. Different viruses predominate at different periods of the year; during flu season, for example, influenza may account for over half of all viral cases. Outbreaks of other viruses also occasionally occur, including hantaviruses and coronavirus.

Question: what percentage of children does the virus affect?
15%