Risk Factors

<p id="H8">Risk factors&#160;—&#160;Patients at risk for lower respiratory tract disease include:

&#160;</p>

<ul >

<li>Infants younger than six months of age, particularly those who are born during the first half of the RSV season and those attending daycare</li>

<li>Infants and children with underlying lung disease, such as chronic lung disease (bronchopulmonary dysplasia)</li>

<li>Infants born before 35 weeks' gestation</li>

<li>Infants and children with congenital heart disease</li>

<li>Infants exposed to secondhand smoke</li>

<li>Immunocompromised patients (eg, severe combined immunodeficiency, leukemia, or bone marrow or lung transplant)</li>

<li>Patients of any age group with significant asthma</li>

<li>Adults with cardiopulmonary disease</li>

<li>Residence at altitude &#62;2500 m</li>

<li>Institutionalized elderly</li>

<li>Elderly patients with chronic pulmonary disease or functional disability</li>

</ul>